Keysight Technologies E5400-Pro Series, E5402A, E5404A, E5406A, E5405B User Manual

Keysight Technologies
E5400-Pro Series Soft
Touch Connectorless
Probes

User’s Guide

Notices

CAUTION

WARNING

© Keysight Technologies 2004-2013,
2014, 2016

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Manual Part Number

E5404-97007, November 2016

Available in electronic format only

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2 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Contents

1 Overview, Installation, and Selection of Probing Options

2 Mechanical Considerations

The E5400-Pro Series Soft Touch Probes — at a Glance 8

Installation Instructions 10

Selection of Probing Options 12

Retention Modules 13
The E5402A-Pro Series Low-profile Right-angle 34-channel Single-ended

Soft Touch Probe (for analyzers with 90-pin cable connectors)

The E5404A-Pro Series 34-channel Single-ended Soft Touch Probe

(for analyzers with 40-pin cable connectors)

The E5405B-Pro Series 17-channel Differential Soft Touch Probe

(for analyzers with 90-pin cable connectors)

The E5406A-Pro Series 34-channel Single-ended Soft Touch Probe

(for analyzers with 90-pin cable connectors)

The E5386A Half-channel Adapter (for use with the 16760A logic

analyzer)

Characteristics 20

18

15

16

17

14

Probe Dimensions 21

Board Layout Dimensions 25

Retention Module Dimensions 25
Footprint Dimensions 28

Pin Outs for the Probes 29

Probing with E5404A-Pro Series Probe 30
Probing with the E5405B-Pro Series Probe 33
Probing with the E5402A/E5406A-Pro Series Probe 36

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 3

Contents

E5386A Half-channel Adapter Dimensions 39

Pin out for the E5386A half-channel adapter when connected to

E5405B

Pin out for two E5386A half-channel adapters connected to one E5402A

or E5406A

40

42

3 Operating the E5404A-Pro Series Probes

Equivalent Probe Loads 46

Time Domain Transmission (TDT) 48

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

Equivalent Probe Loads 52

Time Domain Transmission (TDT) 54

Step Inputs 57

Eye Opening 60

5 Circuit Board Design

Transmission Line Considerations 64

Recommended Routing 65

Data and Clock Inputs per Operating Mode 67

Thresholds 70

E5404A-pro series single-ended soft touch probes 70
E5405B-pro series differential soft touch probe 70
E5402A and E5406A-pro series single-ended soft touch probes 71

Signal Access 71

Labels split across probes 71
Reordered bits 71
Half-channel 1.25 and 1.5 Gb/s modes (16760A only) 71

4 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

6 Recommended Reading

Contents

For More Information 74

MECL System Design Handbook 74
High-speed Digital Design 74
Designing High-speed Target Systems for Logic Analyzer Probing 74

Safety Notices 75

Warnings 75
To clean the instrument 76
Safety Symbols 76

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 5

Contents

6 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

1 Overview,

Installation, and
Selection of Probing
Options

The E5400-Pro Series Soft Touch Probes — at a Glance / 8
Installation Instructions / 10
Selection of Probing Options / 12

1 Overview, Installation, and Selection of Probing Options

The E5400-Pro Series Soft Touch Probes — at a Glance

The new Keysight E5400-pro series soft touch probes are ultra-low-load
connector-less probes that work with the Keysight logic analysis modules.
The probes attach to the PC board using a retention module which ensures
pin-to-pad alignment and holds the probe in place.

• The E5402A-pro series probe is a low-profile right-angle 34-channel
single-ended connector-less soft touch probe (for analyzers with
90-pin cable connectors).

8 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Overview, Installation, and Selection of Probing Options 1

• The E5404A-pro series probe is a 34-channel single-ended
connector-less soft touch probe (for analyzers with 40-pin cable
connectors).

• The E5405B-pro series probe is a 17-channel differential
connector-less soft touch probe (for analyzers with 90-pin cable
connectors).

• The E5406A-pro series probe is a 34-channel single-ended
connector-less soft touch probe (for analyzers with 90-pin cable
connectors).

Use the following information to design your target system board for use
with the Keysight soft touch probes.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 9

1 Overview, Installation, and Selection of Probing Options

Installation Instructions

1 Use the information provided in Chapter 2 to design pads on your

board and holes for mounting the retention module.
The soft touch probes are attached to the PC board using a retention

module which ensures pin-to-pad alignment and holds the probe in
place.

2 Use flux as necessary to clean the board and pins before soldering the

retention module to the board.

3 If your board has Organic Solder Preservative (OSP) finish, apply solder

paste to the footprint pads prior to re-flow or hand soldering.
Typically, dipped and coated finishes do not require extra solder paste.

4 Attach the retention module to the board from either the top or bottom

of the board:
Top-side attach

Can be used with most board thicknesses.
a Insert the retention module into the board noting the keying pin.
b Solder alignment pins from the top ensuring that solder is added

until a fillet is visible on the pin.

Figure 1 Solder retention module from the top.

Bottom-side attach

Can be used for board thickness of 2.54 mm (0.100 in.) or less.
a Insert the retention module into the board noting the keying pin.
b Solder the alignment pins to the back side of the board.

5 Insert the probe into the retention module.

10 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Overview, Installation, and Selection of Probing Options 1

Ensure proper keying by aligning the Keysight logo on the probe with

the one on the retention module and place the probe end into the

retention module.

6 Alternate turning each screw on the probe a little until both screws are

finger tight like you would attach a cable to your PC.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 11

1 Overview, Installation, and Selection of Probing Options

Selection of Probing Options

This chapter provides descriptions of the logic analyzer probes and
adapters to help you select the appropriate probe for your application. The
first table shows how many probes are required to provide connections to
all channels of your logic analyzer module. The second table gives you the
maximum state speed that is supported by the combination of a probe and
your logic analyzer module.

Table 1 Number of Probes Required

Keysight Logic Analyzer Module

Keysight Probe

E5402A right-angle
34-channel single-ended
soft touch probe (90-pin)

E5404A 34-channel
single-ended soft touch
probe (40-pin)

E5405B 17-channel
differential soft touch probe
(90-pin)

E5406A 34-channel
single-ended soft touch
probe (90-pin)

16760A 16753A,

16754A,
16755A,
16756A,
16950A

1 2 n/a n/a n/a n/a n/a

n/a n/a 1 2 3 4 n/a

2 4 n/a n/a n/a n/a 4

1 2 n/a n/a n/a n/a 2

1670 Series
(34ch),
1680/90
Series
(34ch)

1670 Series
(68ch),
1680/90 Series
(68ch),
16715/16/17A,
16740/41/42A,
16750/51/52A&
B,
16911A

1670 Series
(102ch),
1680/90
Series
(102ch),
16710/11/1
2A,
16910A

1670
Series
(136ch),
1680/90
Series
(136ch)

U4154A
U4154B
U4164A

12 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Overview, Installation, and Selection of Probing Options 1

Table 2 Maximum State Speed Supported

Logic Analyzer Module

16753A,
16754A,
16755A,

Probe

E5402A right-angle 34-channel single-ended soft touch probe 1.5 Gb/s 800 Mb/s n/a n/a

E5404A 34-channel single-ended soft touch probe n/a n/a 400 Mb/s 500 Mb/s

E5405B 17-channel differential soft touch probe 1.5 Gb/s 800 Mb/s n/a n/a

E5406A 34-channel single-ended soft touch probe 1.5 Gb/s 800 Mb/s n/a n/a

16760A

16756A
16950A

1670 Series
1680/90 Series,
16710/11/12A,
16715/16/17A,
16740/41/4A,
16750/51/52A&B

16910A/16911A

Retention Modules

A retention module ensures pin-to-pad alignment and holds the probe in
place. A kit of five retention modules is supplied with each probe.
Additional kits (of 5) can be ordered from Keysight Technologies at

http://www.keysight.com/find/softtouch/.

Table 3 Ordering retention modules

Probe

E5402A right-angle 34-channel single-ended soft touch probe E5412A

E5404A 34-channel single-ended soft touch probe E5403A

Keysight Model
Number (kit of 5)

E5405B 17-channel differential soft touch probe E5403A

E5406A 34-channel single-ended soft touch probe E5403A

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 13

1 Overview, Installation, and Selection of Probing Options

The E5402A-Pro Series Low-profile Right-angle 34-channel Single-ended Soft Touch Probe (for analyzers with 90-pin cable connectors)

The Keysight E5402A-pro series probe is a 34-channel, single-ended, soft
touch probe compatible with the Keysight logic analysis modules listed in

Table 1 on page 12. It is capable of capturing data up to the rated

maximum state (synchronous) analysis clock rates of all the supported
analyzers, with signal amplitudes as small as 250 mV peak-to-peak. A
retention module must be installed on the target system board to attach
the probe to the board. There is a key on the retention module that
indicates the egress of the cable when the probe is attached.

A kit of five retention modules are supplied with each probe. Refer to

“Ordering retention modules" on page 13 for information on ordering

more.

See “Mechanical Considerations" on page 19 for information on designing
your target system board.

Figure 2 E5402A-pro series right-angle single-ended soft touch probe and E5412A

14 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

retention module

Overview, Installation, and Selection of Probing Options 1

The E5404A-Pro Series 34-channel Single-ended Soft Touch Probe (for analyzers with 40-pin cable connectors)

The Keysight E5404A-pro series probe is a 34-channel, single-ended, soft
touch probe compatible with the Keysight logic analysis modules listed in

Table 1 on page 12. It is capable of capturing data up to the rated

maximum state (synchronous) analysis clock rates of all the supported
analyzers, with signal amplitudes as small as 500 mV peak-to-peak. A
retention module must be installed on the target system board to attach
the probe to the board.

A kit of five retention modules are supplied with each probe. Refer to

“Ordering retention modules" on page 13 for information on ordering

more.

See “Mechanical Considerations" on page 19 for information on designing
your target system board.

Figure 3 E5404A-pro series single-ended soft touch probe and

E5403A retention module

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 15

1 Overview, Installation, and Selection of Probing Options

The E5405B-Pro Series 17-channel Differential Soft Touch Probe (for analyzers with 90-pin cable connectors)

The Keysight E5405B-pro series probe is a 17-channel, single-ended, soft
touch probe compatible with the Keysight logic analysis modules listed in

Table 1 on page 12. It is capable of capturing data up to the rated

maximum state (synchronous) analysis clock rates of all the supported
analyzers, with differential signal amplitudes as small as 200 mV
peak-to-peak. A retention module must be installed on the target system
board to attach the probe to the board.

A kit of five retention modules are supplied with each probe. Refer to

“Ordering retention modules" on page 13 for information on ordering

more.

See “Mechanical Considerations" on page 19 for information on designing
your target system board.

Figure 4 E5405B-pro series differential soft touch probe and

16 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

E5403A retention module

Overview, Installation, and Selection of Probing Options 1

The E5406A-Pro Series 34-channel Single-ended Soft Touch Probe (for analyzers with 90-pin cable connectors)

The Keysight E5406A-pro series probe is a 34-channel, single-ended, soft
touch probe compatible with the Keysight logic analysis modules listed in

Table 1 on page 12. It is capable of capturing data up to the rated

maximum state (synchronous) analysis clock rates of all the supported
analyzers, with signal amplitudes as small as 250 mV peak-to-peak. A
retention module must be installed on the target system board to attach
the probe to the board.

A kit of five retention modules are supplied with each probe. Refer to

“Ordering retention modules" on page 13 for information on ordering

more.

See “Mechanical Considerations" on page 19 for information on designing
your target system board.

Figure 5 E5406A-pro series single-ended soft touch probe and

E5403A retention module

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 17

1 Overview, Installation, and Selection of Probing Options

The E5386A Half-channel Adapter (for use with the 16760A logic analyzer)

The E5386A Half-channel Adapter is intended to be used with the Keysight
16760A logic analyzer in half-channel state mode and supports the
E5402A, E5405B, and E5406A probes.

The E5386A Half-channel Adapter has its own ID code. When using the
adapter, the 16760A logic analyzer recognizes its code rather than that of
the probe which is attached to the target. Therefore, the user interface
format menu doesn't automatically set thresholds to the proper values.
You need to go into the threshold menu and select (differential, custom, or
standard settings).

When using the adapter in half-channel state mode:

• Clock-bits are not available in half-channel state mode (although JCLK
on the master is still used).

• Be sure to connect Master pod 1 of the logic analyzer to the upper bits,
8-15 + clk, on the half-channel adapter. This is necessary to connect
the clock in the system under test to the logic analyzer system clock.

• Using the E5386A does not reduce the performance of the 16760A
logic analyzer and the soft touch probes.

If the E5386A is used in full-channel state mode, the thresholds on the
unused (odd) bits are floating. This could result in spurious activity
indicators in the format menu.

18 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

2 Mechanical

Considerations

Characteristics / 20
Probe Dimensions / 21
Board Layout Dimensions / 25
Pin Outs for the Probes / 29
E5386A Half-channel Adapter Dimensions / 39

Use the following mechanical information to design your target system
board.

2 Mechanical Considerations

Characteristics

Electrical considerations such as equivalent probe loads, input impedance,
and time domain transmission are shown in chapters 3 and 4 of this
manual. Other characteristics are dependent on the logic analyzer module
you are using.

20 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Probe Dimensions

Mechanical Considerations 2

The following figures show the dimensions of the Keysight E5400-pro
series soft touch probes.

Figure 6 E5402A probe dimensions

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 21

2 Mechanical Considerations

Figure 7 E5404A probe dimensions

22 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Mechanical Considerations 2

Figure 8 E5405B probe dimensions

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 23

2 Mechanical Considerations

Figure 9 E5406A probe dimensions

24 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Board Layout Dimensions

NOTE

0.158 in.

4.01 mm

Retention Module Dimensions

Unless otherwise specified, dimensions are in inches and have the following tolerances.
Linear
X.X = +-0.1
X.XX = +-0.01
X.XXX = +-0.005
X.XXXX = +-0.0005

Angular

X = +-1
X.X = +-0.5
X.XX = +-0.25
X.XXX = +-0.125

Mechanical Considerations 2

Use the following dimensions to layout your PC board pads and holes for
use with the soft touch probes.

Figure 10 E5403A retention module dimensions

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 25

2 Mechanical Considerations

Figure 11 E5412A retention module dimensions

Figure 12 E5403A side-by-side dimensions

26 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Mechanical Considerations 2

Optimal board thickness for this top-side mount retention module is
shown above. Retention modules can be hand soldered into thicker
boards, but will not form a bottom-side solder fillet.

Figure 13 E5412A side-by-side dimensions

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 27

2 Mechanical Considerations

A1

A27

B1

B27

A1

A27

B1

B27

NOTE

Footprint Dimensions

The retention module alignment is symmetrical around the pad footprint.

Figure 14 Top view footprint dimensions (drawing notes next page).

The above view is looking down onto the footprint on the printed-circuit
board.

28 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Pin Outs for the Probes

Drawing notes:

1 Maintain a solder mask web between pads when traces are routed between the pads on the

same layer. The solder mask may not encroach onto the pad s within the pad dimension shown.

2 VIAs not allowed on these pads. VIA edges may be tangent

to pad edges as long as a solder mask web between VIAs
and pads is maintained.

3 Surface finishes on pads should be HASL immersion silver,

or gold over nickel.

4 This footprint is compatible with retention mod ule Keysight

model number E5403A.

5 Plated through hole should not be tied to ground plane for thermal relief.

NOTE

Mechanical Considerations 2

If you will be using the soft touch probes with a 16900-series logic
analyzer running V2.5 or higher, probe types can be defined in XML
configuration files. To get the latest Probes.xml file, go to

www.keysight.com/find/probe-definitions. Install the file in C:\Program

Files\Keysight Technologies\Logic Analyzer\AddIns\Keysight\. Refer to
the logic analyzer on-line help for more information.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 29

2 Mechanical Considerations

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27

D0
D1

GN D

D4
D5

GN D

CK 1+

*

GN D

D10
D11

GN D

D14
D15

GN D

D2
D3

GN D

D6
D7

GN D

D8
D9

GN D

D12
D13

GN D

GN D
D2
D3
GN D
D6
D7
GN D
D8
D9
GN D
D12
D13
GN D
D0
D1
GN D
D4
D5
GN D
*
CK 2+
GN D
D10
D11
GN D
D14
D15

B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27

Logi c
anal yzer
odd pod

Logi c
anal yzer
even pod

Probing with E5404A-Pro Series Probe

The following footprint provides pin out and pad numbers for the E5404A
single-ended probe for use with 40-pin logic analyzers.

30 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 15 Pad numbers for E5404A-pro series.

* If you only plan to use the E5404A 40-pin probe with single-ended
clocking to probe the following footprint, then A8 and B20 are unused.
They can be grounded, not connected, left floating, or driven. These pads
are not probed with the E5404A probe.

Mechanical Considerations 2

If you ever plan on upgrading from a 40-pin to a 90-pin logic analyzer to
take advantage of higher state speed and differential probing on the clock
channel, some steps should be taken so that the original footprint will
work for both the E5404A and the E5406A probes.

• If you are driving only single-ended clocks into A7 (CK1+) and B21

(CK2+), then you should ground A8 and B20. A8 and B20 are where
CK1- and CK2- are driven in the E5406A probe. Grounding these
pads will allow the user-defined threshold in the analyzer to be used
as in normal single-ended operation.

• If you are using differential clocks, route the Odd pod clock such that

the positive side of the pair goes to A7 (CK1+) and the negative side
of the pair goes to A8 (CK1-). Similarly, route the Even pod clock
such that the positive side of the pair goes to B21 (CK2+) and the
negative side of the pair goes to B20 (CK2-). When using the
E5404A probe, A8 and B20 are unused. However, when using the
E5406A probe, A8 and B20 are where the probe connects to the
negative sides of the clocks' differential pair.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 31

2 Mechanical Considerations

E5404A 34-channel
Single-ended Probe Logic Analyzer

Signal Name Pad # Channel Pod Signal Name Pad # Channel Pod

D0 A1

D1 A2

Ground A3 D3 B3

D4 A4

D5 A5

Ground A6 D7 B6

Clock 1+ A7

GND/NC/
Clock 1-

Ground A9 D9 B9

D10 A10

D11 A11

Ground A12 D13 B12

A8

0Whichever

→

1D2B2

→

4GroundB4

→

5D6B5

→

Clock Ground B7

→

See *

→

pg 30

10 Ground B10

→

11 D12 B11

→

pod is
connected to
“Odd” on the
E5404A probe

E5404A 34-channel
Single-ended Probe Logic Analyzer

Ground B1 Whichever

2

→

3

→

6

→

7

→

D8 B8

→

→

→

→

8

9

12

13

pod is
connected to
“Odd” on the
E5404A probe

D14 A13

D15 A14

32 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

14 Ground B13

→

15 D0 B14

→

0Whichever

→

pod is
connected to
“Even” on the
E5404A probe

Mechanical Considerations 2

E5404A 34-channel
Single-ended Probe Logic Analyzer

Signal Name Pad # Channel Pod Signal Name Pad # Channel Pod

Ground A15 Whichever

D2 A16

D3 A17

Ground A18 D5 B18

D6 A19

D7 A20

Ground A21 Clock 2+ B21

D8 A22

D9 A23

Ground A24 D11 B24

D12 A25

D13 A26

2GroundB16

→

3D4B17

→

6GroundB19

→

7Ground/NC/Cl

→

8GroundB22

→

9 D10 B23

→

12 Ground B25

→

13 D14 B26

→

pod is
connected to
“Even” on the
E5404A probe

E5404A 34-channel
Single-ended Probe Logic Analyzer

D1 B15

B20

ock 2-

→

→

→

→

→

→

→

→

1

4

5

See *
pg 30

Clock

10

11

14

Ground A27 D15 B27

→

15

Probing with the E5405B-Pro Series Probe

The following footprint provides pin out and pad numbers for the E5405B
differential probe for use with 90-pin logic analyzers.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 33

2 Mechanical Considerations

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27

D0+

D0-

GN D

D2+

D2-

GN D

D4+

D4-

GN D

D6+

D6-

GN D

NC
NC

GN D

D8+

D8-

GN D

D10+

D10­GN D

D12+

D12­GN D

D14+

D14­GN D

GN D
D1­D1+
GN D
D3­D3+
GN D
D5­D5+
GN D
D7­D7+
GN D
CLK­CLK+
GN D
D9­D9+
GN D
D11­D11+
GN D
D13­D13+
GN D
D15­D15+

B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27

E5405B Differential

Signal
Name

D0 (+) A1 → 0Whichever

D0 (-) A2 D1 (-) B2

Ground A3 D1 (+) B3

34 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Probe

Pad# Channel Pod Signal

Figure 16 Pad numbers for E5405B-pro series.

Logic Analyzer E5405B Differential

pod is
plugged
into the
E5405B
probe

Probe

Logic Analyzer

Pad# Channel Pod

Name

Ground B1 Whichever

→ 1

pod is
plugged
into the
E5405B
probe

Mechanical Considerations 2

E5405B Differential

Probe

Signal
Name

D2 (+) A4 → 2GroundB4

D2 (-) A5 D3 (-) B5

Ground A6 D3 (+) B6 → 3

D4 (+) A7

D4 (-) A8 D5 (-) B8

Ground A9 D5 (+) B9

D6 (+) A10 → 6 Ground B10

D6 (-) A11 D7 (-) B11

Ground A12 D7 (+) B12 → 7

NC A13 Ground B13

NC A14 Clock - B14

GND A15 Clock + B15 → Clock

D8 (+) A16 → 8 Ground B16

D8 (-) A17 D9 (-) B17

Pad# Channel Pod Signal

→ 4GroundB7

Logic Analyzer E5405B Differential

Probe

Pad# Channel Pod

Name

Logic Analyzer

→ 5

Ground A18 D9 (+) B18 → 9

D10 (+) A19 → 10 Ground B19

D10 (-) A20 D11 (-) B20

Ground A21 D11 (+) B21 → 11

D12 (+) A22

D12 (-) A23 D13 (-) B23

Ground A24 D13 (+) B24

D14 (+) A25

D14 (-) A26 D15 (-) B26

Ground A27 D15 (+) B27

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 35

→ 12 Ground B22

→ 13

→ 14 Ground B25

→ 15

2 Mechanical Considerations

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27

D0
D1

GN D

D4
D5

GN D

CK 1+

*GND/ CK1-

GN D

D10
D11

GN D

D14
D15

GN D

D2
D3

GN D

D6
D7

GN D

D8
D9

GN D

D12
D13

GN D

GN D
D2
D3
GN D
D6
D7
GN D
D8
D9
GN D
D12
D13
GN D
D0
D1
GN D
D4
D5
GN D
*GND/ CK 2­CK 2+
GN D
D10
D11
GN D
D14
D15

B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27

Logi c
anal yzer
odd pod

Logi c
anal yzer
even pod

Probing with the E5402A/E5406A-Pro Series Probe

The following footprint provides pin out and pad numbers for the
E5402A/E5406A single-ended probe for use with 90-pin logic analyzers.

36 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 17 Pad numbers for E5402/E5406A-pro series

Mechanical Considerations 2

E5402A/E5406A

34-channel Single-ended

Probe

Signal Name Pad # Channel Pod Signal Name Pad # Channel Pod

D0 A1

D1 A2

Ground A3 D3 B3

D4 A4

D5 A5

Ground A6 D7 B6

Clock 1+ A7

GND/
Clock 1-

Ground A9 D9 B9

D10 A10

D11 A11

A8

→

→

→

→

→

→

→

→

Logic Analyzer

0Whichever

1D2B2

4GroundB4

5D6B5

Clock Ground B7

Clock D8 B8

10 Ground B10

11 D12 B11

pod is
connected to
“Odd” on the
5402A/
E5406A probe

E5402A/E5406A

34-channel Single-ended

Probe

Ground B1 Whichever

→

→

→

→

→

→

→

2

3

6

7

8

9

12

Logic Analyzer

pod is
connected to
“Odd” on the
E5402/
E5406A probe

Ground A12 D13 B12

D14 A13

D15 A14

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 37

14 Ground B13

→

15 D0 B14

→

13

→

0Whichever

→

pod is
connected to
“Even” on the
E5402A/
E5406A probe

2 Mechanical Considerations

E5402A/E5406A

34-channel Single-ended

Probe

Signal Name Pad # Channel Pod Signal Name Pad # Channel Pod

Ground A15 Whichever

D2 A16

D3 A17

Ground A18 D5 B18

D6 A19

D7 A20

Ground A21 Clock 2+ B21

D8 A22

D9 A23

Ground A24 D11 B24

D12 A25

→

→

→

→

→

→

→

Logic Analyzer

pod is

2GroundB16

3D4B17

6GroundB19

7Ground/

8GroundB22

9 D10 B23

12 Ground B25

connected to
“Even” on the
E5402A/
E5406A probe

E5402A/E5406A

34-channel Single-ended

Probe

D1 B15

B20

Clock 2-

→

→

→

→

→

→

→

1

4

5

Clock

Clock

10

11

Logic Analyzer

D13 A26

Ground A27 D15 B27

38 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

13 D14 B26

→

→

→

14

15

E5386A Half-channel Adapter Dimensions

The E5386A half-channel adapter works with the 16760A logic analyzer
and the soft touch probes.

Mechanical Considerations 2

Figure 18 E5386A dimensions

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 39

2 Mechanical Considerations

Pin out for the E5386A half-channel adapter when connected to E5405B

When used with the E5405B-pro series differential soft touch probe, you
need only one half-channel adapter. The table below shows the pin
assignments.

Figure 19 Half-channel adapter with E5405B-pro series

40 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Mechanical Considerations 2

Table 4 Pin-out table for E5386A connected to an E5405B

E5405B Differential Probe

Negative Signals Positive Signals Logic Analyzer

Signal Name Pin# Signal Name Pin# Channel Pod

D0(-) A2 D0(+) A1

D1(-) B2 D1(+) B3

D2(-) A5 D2(+) A4

D3(-) B5 D3(+) B6

D4(-) A8 D4(+) A7

D5(-) B8 D5(+) B9

D6(-) A11 D6(+) A10

D7(-) B11 D7(+) B12

D8(-) A17 D8(+) A16

D9(-) B17 D9(+) B18

D10(-) A20 D10(+) A19

D011(-) B20 D11(+) B21

D12(-) A23 D12(+) A22

D13(-) B23 D13(+) B24

→

→

→

→

→

→

→

→

→

→

→

→

→

→

0 Whichever pod is

plugged into bits 0-7

2

4

6

8

10

12

14

0 Whichever pod is

plugged into bits 8-15

2

4

6

8

10

D14(-) A26 D14(+) A25

D15(-) B26 D15(+) B27

D16(-)/Clk(-) B14 D16(+)/Clk(+) B15

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 41

→

→

→

12

14

Clock

2 Mechanical Considerations

The E5386A that is connected to the end
of the E5402A/E5406A labeled ‘od d’
becomes the ‘odd’ E5386A adapter.

Pin out for two E5386A half-channel adapters connected to one E5402A or E5406A

When used with the E5402A/E5406A-pro series single-ended soft touch
probe, you need two half-channel adapters, one adapter for Odd data and
one for Even data. The table below shows the pin assignments.

Figure 20 Two half-channel adapters with E5402A/E5406A-pro series

42 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Mechanical Considerations 2

Table 5 Pin-out table for two E5386A adapters connected to an E5402A or E5406A

E5386A Adapter Odd E5386A Adapter Even

E5402A/E5406A

34-channel Single-ended

Probe

Signal Name Pin # Channel Pod Signal Name Pin # Channel Pod

D0 A1

D1 A2

D2 B2

D3 B3

D4 A4

D5 A5

D6 B5

D7 B6

D8 B8

D9 B9

D10 A10

D11 A11

→

→

→

→

→

→

→

→

→

→

→

→

Logic Analyzer

0 Whichever pod

2D1B15

4D2A16

6D3A17

8D4B17

10 D5 B18

12 D6 A19

14 D7 A20

0 Whichever pod

2D9A23

4 D10 B23

6 D11 B24

is connected to
bits 0-7 on the
odd E5386A

is connected to
bits 8-15 on the
odd E5386A

E5402A/E5406A

34-channel Single-ended

Probe

D0 B14

D8 A22

Logic Analyzer

0 Whichever pod

→

2

→

4

→

6

→

8

→

10

→

12

→

14

→

0 Whichever pod

→

2

→

4

→

6

→

is connected to
bits 0-7 on the
even E5386A

is connected to
bits 8-15 on the
even E5386A

D12 B11

D13 B12

D14 A13

D15 A14

D16(+)/Clk(+)

D16(-)/Clk(-) A8

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 43

A7

8D12A25

→

10 D13 A26

→

12 D14 B26

→

14 D15 B27

→

Clock(+)

→

Clock(-) D16(-)/Clk(-) B20

→

D16(+)/Clk(+)

B21

→

→

→

→

→

→

8

10

12

14

Clock(+)

Clock(-)

2 Mechanical Considerations

44 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

3 Operating the

E5404A-Pro Series
Probes

Equivalent Probe Loads / 46
Time Domain Transmission (TDT) / 48

Electrical considerations such as equivalent probe loads, input impedance,
and time domain transmission (TDT).

3 Operating the E5404A-Pro Series Probes

400Ω

Rt a p

Cs t u b

0.375pF

Rt i p

100kΩ

Di n

Ct i p

10pF

250Ω

Rt i p 1

1.17nH

Lspr i ng2

0.63nH

Lspr i n g1

Cs t u b

0.375pF

Rgnd1

10Ω

Ccoupl i ng

0.070pF

Rt i p 2

100kΩ

Di n

Ct i p

10pF

Rgnd2
120Ω

Complex

(Includes capacitive coupling between channels and inductance of spring pins.)

Simple

(Does not include capacitive coupling between channels or inductance of the spring pins)

Equivalent Probe Loads

The following probe load models are based on in-circuit measurements
made with a Keysight 8753E 6 GHz network analyzer and a Keysight
54750A TDR/TDT using a 50 Ω test fixture. The following schematic
accurately models the probe load out to 6 GHz. The figure on the following
page shows the agreement between measured impedance and this model.

46 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 21 Probe load models (E5404A)

Operating the E5404A-Pro Series Probes 3

1
8
6

10

5

4

2

1
8
6

4

2

Ohms

10

Frequency

68

1247

9

3

5

68

124

7

9

3

56 8

124

7

9

3568

124

7

9

3

568124

7

9

3

5

6

Modeled
(complex)

1
8
6

4

2

1
8
6

4

Modeled

(simple)

Measured

100k 1M 10M 100M 1G

Figure 22 Measured versus modeled input impedance (E5404A)

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 47

3 Operating the E5404A-Pro Series Probes

Time Domain Transmission (TDT)

All probes have a loading effect on the circuit when they come in contact
with the circuit. Time domain transmission (TDT) measurements are useful
for understanding the probe loading effects as seen at the target receiver.
The following TDT measurements were made mid-bus on a 50Ω
transmission line load terminated at the receiver. These measurements
show how the soft touch probes affect an ideal step seen by the receiver
for various rise times.

48 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 23 TDT measurement schematic (E5404A)

The following plots were made on a Keysight 54750A oscilloscope using
TDT.

Operating the E5404A-Pro Series Probes 3

50 mV per division

500 ps per division

with probe

without probe

50 mV per division

500 ps per division

with probe

without probe

Figure 24 TDT measurement at receiver with and without probe load for 150 ps rise time

Figure 25 TDT measurement at receiver with and without probe load for 250 ps rise time

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 49

3 Operating the E5404A-Pro Series Probes

50 mV per division

500 ps per division

with probe

without probe

50 mV per division

500 ps per division

with probe

without probe

Figure 26 TDT measurement at receiver with and without probe load for 500 ps rise time

Figure 27 TDT measurement at receiver with and without probe load for 1000 ps rise time

50 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

4 Operating the

E5402A, E5405B, and
E5406A-Pro Series
Probes

Equivalent Probe Loads / 52
Time Domain Transmission (TDT) / 54
Step Inputs / 57
Eye Opening / 60

Electrical considerations such as equivalent probe loads, input impedance,
time domain transmission (TDT), step inputs, and eye opening.

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

20KΩ

Rt i p 1

1.17nH

L12

0.63nH

L11

C1 2

0.280pF

Rgnd1

0.5Ω

Cm1 2

0.070pF

Rt r m1

75Ω

.350pF

Cshnt 1

20KΩ

Rt i p 2

1.17nH

L22

0.63nH

L21

C2 2

0.280pF

Rgnd2

0.5Ω

Rt r m2

75Ω

.350pF

Cshnt 2

D1

D0

+0.75V

+0.75V

Equivalent Probe Loads

The following probe load models are based on in-circuit measurements
made with a Keysight 8753E 6 GHz network analyzer and a Keysight
54750A TDR/TDT using a 50 Ω test fixture. The following schematic
accurately models the probe load out to 6 GHz. The figure on the following
page shows the agreement between measured impedance and this model.
PC board pads are not included.

52 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 28 Probe load model (E5402A, E5405B, and E5406A)

Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4

2

1
8

6

10

4

4

2

1
8

6

4

2

1
8

6

4

2

Ohm s

10

1

10 0 k

Frequency

68

1247

9

3

56 8

124

79 3 56 8

124

79 3 56 8

124

7

9

3

56 8 1 2 47

9

3

5

6

Measured

Model

1 M 10 M 100 M 1 G

Figure 29 Measured versus modeled input impedance (E5402A, E5404A, and E5406A)

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 53

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

50 mV per division

500 ps per division

with probe

without probe

Time Domain Transmission (TDT)

All probes have a loading effect on the circuit when they come in contact
with the circuit. Time domain transmission (TDT) measurements are useful
for understanding the probe loading effects as seen at the target receiver.
The following TDT measurements were made mid-bus on a 50Ω
transmission line load terminated at the receiver. These measurements
show how the E5402A, E5405B, and E5406A-pro series soft touch probes
affect an ideal step seen by the receiver for various rise times.

54 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 30 TDT measurement schematic (E5402A, E5405B, and E5406A)

The following plots were made on a Keysight 54750A oscilloscope using
TDT.

Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4

50 mV per division

500 ps per division

with probe

without probe

50 mV per division

500 ps per division

with probe

without probe

Figure 31 TDT measurement at receiver with and without probe load for 100 ps rise time

Figure 32 TDT measurement at receiver with and without probe load for 250 ps rise time

Figure 33 TDT measurement at receiver with and without probe load for 500 ps rise time

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 55

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

50 mV per division

500 ps per division

with probe

without probe

Figure 34 TDT measurement at receiver with and without probe load for 1000 ps rise time

56 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Step Inputs

E5382A

Probe

Z0=5 0 Ω

Rterm

Driver Receiver

Rsource

Step

output

50 Ω

Z0=50 Ω

50 Ω

Logic

Analyzer

w/ EyeScan

Oscilloscope

2.5GHz BW
incl. probe

54701A

Probe

Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4

Maintaining signal fidelity to the logic analyzer is critical if the analyzer is
to accurately capture data. One measure of a system's signal fidelity is to

to V

compare V

in

for various step inputs. For the following graphs, Vin is

out

the signal at the logic analyzer probe tip. Eye Scan was used to measure
V

, the signal seen by the logic analyzer. The measurements were made

out

on a mid-bus connection to a 50Ω transmission line load terminated at the
receiver. These measurements show the logic analyzer's response while
using the E5402A, E5405B, and E5406A-pro series soft touch probes.

Figure 35 Step input measurement schematic (E5402A, E5405B, and E5406A)

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 57

The following plots were made on a Keysight 54750A oscilloscope and a
Keysight 16760A logic analyzer using a Keysight 8133A pulse generator
with various rise time converters.

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

100 mV per division

500 ps per division

Scope

EyeScan

100 mV per division

500 ps per division

Scope

EyeScan

Figure 36 Logic analyzer’s response to 150 ps rise time

Figure 37 Logic analyzer’s response to 250 ps rise time

58 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4

100 mV per division

500 ps per division

Scope

EyeScan

100 mV per division

500 ps per division

Scope

EyeScan

Figure 38 Logic analyzer’s response to 500 ps rise time

Figure 39 Logic analyzer’s response to 1000 ps rise time

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 59

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

E5382A

Probe

Z0=5 0 Ω

Rterm

Driver Receiver

Rsource

PRBS
output

50 Ω

Z0=50 Ω

50 Ω

Logic

Analyzer

w/ EyeScan

Eye Opening

The eye opening at the logic analyzer is the truest measure of an analyzer's
ability to accurately capture data. Seeing the eye opening at the logic
analyzer is possible with Eye Scan. The eye opening viewed with Eye Scan
helps the user know how much margin the logic analyzer has, where to
sample and at what threshold. Any probe response that exhibits overshoot,
ringing, probe non-flatness, noise, and other issues all deteriorate the eye
opening seen by the logic analyzer. The following eye diagrams were
measured using E5402A, E5405B, and E5406A-pro series soft touch
probes and Eye Scan while probed mid-bus on a 50Ω transmission line
load terminated at the receiver. The data patterns were generated using a

23

-1 pseudo random bit sequence (PRBS).

2

Figure 40 Eye opening measurement schematic (E5402/05/06A)

60 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

The following plots were made on a Keysight 16760A logic analyzer using
a Keysight 8133A pulse generator with a 250 ps rise time converter. The
following measurements use Eye Scan to show the margin at 800, 1250,
and 1500MT/s. The amplitudes are indicated in the captions.

Operating the E5402A, E5405B, and E5406A-Pro Series Probes 4

100 mV per division

500 ps per division

100 mV per division

500 ps per division

Figure 41 Logic analyzer eye opening for a PRBS signal of 500 mV p-p, 800 MT/s data

rate

Figure 42 Logic analyzer eye opening for a PRBS signal of 500 mV p-p, 1250 MT/s data

rate

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 61

4 Operating the E5402A, E5405B, and E5406A-Pro Series Probes

100 mV per division

500 ps per division

100 mV per division

500 ps per division

Figure 43 Logic analyzer eye opening for a PRBS signal of 500 mV p-p, 1500 MT/s data

rate

Figure 44 Logic analyzer eye opening for a PRBS signal of 200 mV p-p, 1500 MT/s data

rate

62 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

5 Circuit Board Design

Transmission Line Considerations / 64
Recommended Routing / 65
Data and Clock Inputs per Operating Mode / 67
Thresholds / 70
Signal Access / 71

Design considerations when you layout your circuit board.

5 Circuit Board Design

Transmission Line Considerations

Stubs connecting signal transmission lines to the connector should be as
short as feasible. Longer stubs will cause more loading and reflections on
a transmission line. If the electrical length of a stub is less than 1/5 of the
signal rise time, it can be modeled as a lumped capacitance. Longer stubs
must be treated as transmission lines.

Example: Assume you are using FR-4 PC board material with a dielectric constant of

~4.3 for inner-layer traces (stripline). For example, A 0.28 cm long stub in
an inner layer has a propagation delay of ~20 ps. Therefore, for a signal
with a rise time of 100 ps or greater, a 0.28 cm stub will behave like a
capacitor.

The trace capacitance per unit length will depend on the trace width and
the spacing to ground or power planes. If the trace is laid out to have a
characteristic impedance of 50 Ω it turns out that the capacitance per unit
length is ~1.2 pF/cm. Therefore the 0.28 cm stub in the previous example
would have an effective capacitance equal to ~0.34 pF.

This trace capacitance is in addition to the probe load model.

64 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Recommended Routing

D0

B1A1

B27A27

D1
D2

D3
D4

D5
D6

D7
CK1+

CK1­D8

D9
D10

D11
D12

D13
D14

D15

ODD POD EVEN POD

D0
D1

D2
D3
D4
D5

D6
D7

CK2­CK2+

D8
D9

D10
D11

D12
D13

D14
D15

Circuit Board Design 5

Two rows of compliant contacts in the probe make contact with pads laid
down on the surface of the PC board. These contacts provide an extremely
low probe load (<0.70 pF per channel), and make a good electrical
connection with a small amount of compression force on a choice of
standard PCB platings. Additionally, the pin contact points are free from
the contamination effects that plague other connector-less probing
technologies.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 65

Figure 45 34-bit single-ended routing (E5402A, E5404A, and E5406A)

5 Circuit Board Design

+

B1A1

B27A27

-

­+
+

-

­+

+

-

­+

+

-

­+

­+

+

-

­+

+

-

­+

+

-

­+

+

-

­+

D0
D1
D2
D3

D4
D5
D6
D7

D8
D9
D10
D11

D12
D13
D14

D15

CK

66 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Figure 46 17-bit differential routing (E5405B)

Data and Clock Inputs per Operating Mode

The following table shows the number of data and clock inputs for each
connector on your target system for the various operating modes of your
logic analyzer.

Table 6 16760A logic analyzer

Circuit Board Design 5

E5405B

Operating
Mode

Synchronous (state)
analysis
200 Mb/s,
400 Mb/s,
800 Mb/s

Synchronous (state)
analysis
1250 Mb/s
1500 Mb/s

Eye scan mode
800 Mb/s

Eye scan mode
1500 Mb/s

Timing mode 16 data

17-channel
differential
soft touch

16 data
plus 1 clock input (see
note 1)

8 data
plus 1 clock input (see
note 2)

16 data
plus 1 clock input (see
note 1)

8 data
plus 1 clock input (see
note 2)

plus 1 clock input (see
note 3)

E5402A or E5406A

E5405B with half-channel
adapter E5386A

N/A 32 data

16 data
plus 1 clock input
(see note 2)

N/A 32 data

16 data
plus 1 clock input
(see note 2)

N/A 32 data

34-channel
single-ended
soft touch

plus 2 clock inputs
(see note 1)

16 data
plus 1 clock input
(see note 2)

plus 2 clock inputs
(see note 1)

16 data
plus 1 clock input
(see note 2)

plus 2 clock inputs
(see note 3)

E5402A or
E5406A with half-channel
adapter E5386A

N/A

16 data
plus 1 clock input
(see note 2)

N/A

16 data
plus 1 clock input
(see note 2)

N/A

Note 1: In the 200 Mb/s, 400 Mb/s, and 800 Mb/s synchronous (state) analysis modes,

and the 800 Mb/s eye scan mode, there is one clock input which must be routed to
the clock input on pod 1 (of the master module, in a multi-card set). The clock in­puts on other pods can be assigned to labels and acquired as data inputs.

Note 2: In the 1250 Mb/s and 1500 Mb/s synchronous (state) analysis modes, and in

the 1500 Mb/s eye scan mode, the clock inputs on other pods cannot be assigned
to labels and acquired as data inputs.

Note 3: In asynchronous (timing) analysis, all inputs including clocks can be acquired

and assigned to labels.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 67

5 Circuit Board Design

- To realize 17 data inputs (in full-channel mode) while using time tags in addition to
a clock input on a single 16760A module or on the master module in a multi-card
set, you must route the data signals to pod 2 and the clock to pod 1. A convenient
way to avoid laying out a second connector to connect only the clock signal is to
use the Keysight E5382B flying-lead set to make the connection to the clock.

- To use the qualifier input for eye scan, the qualifier signal must be routed to the clock
input on pod 2 (K clock), and the clock must be routed to the clock input on pod 1
(J clock), each on the master module in case of a multi-card set.

- In a multiple-card set, the clock used for synchronous (state) analysis must be routed
to the clock input on pod 1 of the master module. On a single card, the clock must
be routed to the clock input on pod 1.

Table 7 16753/54/55/56A and 16950A logic analyzers

Operating Mode

Synchronous (state)
analysis
300 Mb/s
800 Mb/s,

Eye scan mode
300 Mb/s
600 Mb/s

Timing mode 16 data plus 1 clock input (see

E5405B 17-channel
differential soft touch

16 data plus 1 clock input (see
note 1)

16 data plus 1 clock input (see
note 1)

note 1)

E5402A or E5406A
34-channel
single-ended soft touch

32 data plus 2 clock inputs
(see note 1)

32 data plus 2 clock inputs
(see note 1)

32 data plus 2 clock inputs
(see note 3)

Note 1: In 600 Mb/s mode, there is one clock input which must be routed to the clock

input on pod 1 of the master module in a multi-card set. The clock inputs on the
other pods can be assigned to labels and acquired as data inputs.

68 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Circuit Board Design 5

Table 8 1670 Series, 1680/90 Series, 16710/11/12A, 16715/16/17A, 16740/41/4A,

16750/51/52B, 16910/11A logic analyzers

Operating Mode

Synchronous (state) analysis
250 Mb/s, 500 Mb/s,

Timing mode 32 data plus 2 clock inputs

E5404A 34-channel
single-ended soft touch

32 data plus 2 clock inputs
(see note 1)

(see note 1)

Note 1: In 500 Mb/s mode, there is one clock input which must be routed to the clock

input on pod 1 of the master module in a multi-card set. The clock inputs on the
other pods can be assigned to labels and acquired as data inputs.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 69

5 Circuit Board Design

NOTE

Thresholds

E5404A-pro series single-ended soft touch probes

Data inputs

The threshold can be changed on a “per pod” basis (16 data + 1 clock).
This is accomplished using the “user defined threshold” window in the
logic analyzer software.

E5405B-pro series differential soft touch probe

Data inputs

If you are using the E5405B differential soft touch probe to acquire
differential signals, you would normally allow the logic analyzer to
discriminate between high and low states based on the crossover of the
data and data inputs.

You may also use the E5405B differential probe to acquire single-ended
signals. If you are using the E5405B probe to acquire single-ended signals,
you should either ground the data
supply. You may:

• Ground the data inputs and adjust the threshold in the user interface.

Or

• Supply a threshold reference voltage to the data

the threshold in the user interface should be set to zero.

If your circuit uses a resistive divider to provide a threshold reference,
make sure the thevinen equivalent resistance is around 50 Ω.

inputs or connect them to a dc power

inputs. In this case,

The data thresholds can only be changed on a 16-bit per pod basis (16
data). All clock thresholds can be changed individually.

Clock input

The same choices exist for the clock input on the E5405B differential probe
as outlined above for the data inputs. The clock input has a separate,
independent threshold adjustment.

70 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

E5402A and E5406A-pro series single-ended soft touch probes

Clock input

The clock input to the E5402A and E5406A probe is differential. If you
supply a differential clock, you should select the “differential” option in the
clock threshold user interface.

Circuit Board Design 5

Signal Access

If your system uses a single-ended clock signal, the clock
either grounded or connected to a dc power supply. You may:

• Ground the clock

interface to between -3V dc and +5V dc.

Labels split across probes

If a label is split across more than one pod, this leads to restrictions in
triggering. Refer to “Triggering with the Keysight 1675x and 1676x"
(Keysight publication number 5988-2994EN) for more details.

Reordered bits

If bits need to be reordered within a label, this leads to additional
restrictions in triggering. Specifically, equalities can be used to evaluate
the value of a label with reordered bits, but inequalities cannot be used.
You may be able to avoid the need to reorder bits in a label by routing
signals to appropriate pins on the probe connector. Refer to “Triggering
with the Keysight 1675x and 1676x" (Keysight publication number
5988-2994EN) for more details.

Half-channel 1.25 and 1.5 Gb/s modes (16760A only)

In the half-channel 1.25 and 1.5 Gb/s modes, the 16760A analyzer
accesses only the even channels (0,2,4, etc.). In the Format user interface,
only the even data bits will be connected to the analyzer.

Note that in the 1.25 and 1.5 Gb/s half-channel mode, the clock inputs
cannot be assigned as bits in a label.

E5386A Half-channel Adapter

The E5386A can be used with the E5405B-pro series differential soft touch
probe or the E5402A/E5406A-pro series single-ended probes to map the
signals from the PC board pads to the 16760A when operating in
half-channel state mode.

input and adjust the clock threshold from the user

input should be

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 71

5 Circuit Board Design

Figure 47 E5386A Half-channeled adapter

72 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight E5400-Pro Series Soft Touch Connectorless Probes

User’s Guide

6 Recommended

Reading

For More Information / 74

A list of recommended reading for more information about systems and
high-speed digital design.

6 Recommended Reading

For More Information

MECL System Design Handbook

High-speed Digital Design

For more information on Keysight logic analyzers, refer to

http://www.keysight.com/find/logicanalyzer. For more information on

your specific analyzer, refer to the online help in the product.

For information on other Keysight probing solutions, refer to

http://www.keysight.com/find/logic_analyzer_probes.

Blood, William R. Jr., "MECL System Design Handbook," 4th edition, 1988,
published by Motorola. This handbook can be obtained from ON
Semiconductor on the web. Go to <http://onsemi.com>. Click on "On-line
ordering" under “Documentation” Click on the link “General search.” Type
in “HB205” in the “Document number” field. Click “Submit.” To view the
document online, click on “PDF” in the right-hand column titled “PDF
MFAX.” Or order a hardcopy of the handbook on-line.

Johnson, Howard W., and Martin Graham, “High-speed Digital Design,”
Prentice-Hall, 1993, ISBN 0-13-395724-1

Designing High-speed Target Systems for Logic Analyzer Probing

“Designing High-speed Target Systems for Logic Analyzer Probing”
Keysight Technologies application note publication number 5988-2989EN.

74 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Safety Notices

Warnings

This apparatus has been designed and tested in accordance with IEC
Publication 1010, Safety Requirements for Measuring Apparatus, and has
been supplied in a safe condition. This is a Safety Class I instrument
(provided with terminal for protective earthing). Before applying power,
verify that the correct safety precautions are taken (see the following
warnings). In addition, note the external markings on the instrument that
are described under “Safety Symbols.”

• Before turning on the instrument, you must connect the protective

earth terminal of the instrument to the protective conductor of the
(mains) power cord. The mains plug shall only be inserted in a socket
outlet provided with a protective earth contact. You must not negate
the protective action by using an extension cord (power cable) without
a protective conductor (grounding). Grounding one conductor of a
two-conductor outlet is not sufficient protection.

• Only fuses with the required rated current, voltage, and specified type

(normal blow, time delay, etc.) should be used. Do not use repaired
fuses or short-circuited fuse holders. To do so could cause a shock or
fire hazard.

• If you energize this instrument by an auto transformer (for voltage

reduction or mains isolation), the common terminal must be connected
to the earth terminal of the power source.

• Whenever it is likely that the ground protection is impaired, you must

make the instrument inoperative and secure it against any unintended
operation.

• Service instructions are for trained service personnel. To avoid

dangerous electric shock, do not perform any service unless qualified to
do so. Do not attempt internal service or adjustment unless another
person, capable of rendering first aid and resuscitation, is present.

• Do not install substitute parts or perform any unauthorized

modification to the instrument.

• Capacitors inside the instrument may retain a charge even if the

instrument is disconnected from its source of supply.

• Do not operate the instrument in the presence of flammable gases or

fumes. Operation of any electrical instrument in such an environment
constitutes a definite safety hazard.

• Do not use the instrument in a manner not specified by the

manufacturer.

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 75

To clean the instrument

!

If the instrument requires cleaning: (1) Remove power from the instrument.
(2) Clean the external surfaces of the instrument with a soft cloth
dampened with a mixture of mild detergent and water. (3) Make sure that
the instrument is completely dry before reconnecting it to a power source.

Safety Symbols

Instruction manual symbol: the product is marked with this symbol
when it is necessary for you to refer to the instruction manual in
order to protect against damage to the product.

Hazardous voltage symbol.

Earth terminal symbol: Used to indicate a circuit common connected to
grounded chassis.

76 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Index

A

adapter, E5386A half-channel, 18
analyzer, 74
at a glance, 8
attach retention module, 10

B

bottom-side attach, 10

C

Characteristics, 20
circuit board design, 63
cleaning the instrument, 76
clock inputs, 67

E5405B, 70
E5406A, 71

D

data inputs, 67

E5404B, 70
E5405B, 70
E5406A, 71

design

for logic analyzer probing, 74
high-speed digital, 74
high-speed target systems, 74
MECL, 74

design theory, 63
differential probe

E5405B, 16

dimensions

E5386A half-channel adapter, 39
E5404A probe, 21
E5405B probe, 23
E5406A probe, 24
footprint, 28

retention module, 25

E

E5386A half-channel adapter, 18
E5404A 34-chan single ended, 14,

15

E5405B 17-chan differential, 16
E5406A 34-chan single-ended, 17
equivalent probe loads

E5404A, 46
E5405B, 52
E5406A, 52

eye opening, 60
eye scan, 67

F

footprint dimensions, 28

H

half-channel adapter, 18
half-channel mode, 71
high-speed

digital design, 74
target system design, 74

I

installation, 10
instrument, cleaning the, 76

K

keep-out area, 28
keying pin, 10
Keysight web site

logic analyzer info, 74

probing, 74

L

labels, 71
logic analyzer, 74

design for probing, 74

M

MECL system design, 74

N

Notices, 75
number of probes required, 12

O

operating mode, 67
ordering retention modules, 13
overview, 8

P

pinout, 29

E5386A used with E5387A, 40
E5386A used with E5390A, 42

probe

E5404A single-ended, 14, 15
E5405B 17-chan differential, 16
E5406A 34-chan single-ended, 17
number required, 12
state speed, 13

probe load

E5404A, 46
E5405B, 52
E5406A, 52

probing options, 12

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 77

Index

R

reordered bits, 71
replaceable part

retention module, 13

required number of probes, 12
retention module

attaching, 10
dimensions, 25
ordering, 13

routing, 65

S

safety symbols, 76
selecting a probe, 12
signal access, 71
single-ended probe

E5405B, 14, 15
E5406A, 17

solder retention module, 10
state speed, 13
step inputs, 57
synchronous state analysis, 67

T

thresholds, 70
time domain transmission, 54

E5404A, 48

top-side attach, 10
transmission line

considerations, 64

triggering, 71

78 Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide

Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes User’s Guide 79

This information is subject to
change without notice.
© Keysight Technologies 2016
November 2016

www.keysight.com