MAXIM MAX9394, MAX9395 User Manual

General Description

The MAX9394/MAX9395 consist of a 2:1 multiplexer
and a 1:2 demultiplexer with loopback. The multiplexer
section (channel B) accepts two low-voltage differential
signaling (LVDS) inputs and generates a single LVDS
output. The demultiplexer section (channel A) accepts
a single LVDS input and generates two parallel LVDS
outputs. The MAX9394/MAX9395 feature a loopback
mode that connects the input of channel A to the output
of channel B and connects the selected input of chan­nel B to the outputs of channel A.

Three LVCMOS/LVTTL logic inputs control the internal
connections between inputs and outputs, one for the
multiplexer portion of channel B (BSEL), and the other
two for loopback control of channels A and B (LB_SELA
and LB_SELB). Independent enable inputs for each dif­ferential output pair provide additional flexibility.

Fail-safe circuitry forces the outputs to a differential low
condition for undriven inputs or when the common­mode voltage exceeds the specified range. The
MAX9394 provides high-level input fail-safe detection
for HSTL, LVDS, and other GND-referenced differential
inputs. The MAX9395 provides low-level fail-safe detec­tion for CML, LVPECL, and other VCC-referenced differ­ential inputs.

Ultra low 91ps

P-P

(max) pseudorandom bit sequence
(PRBS) jitter ensures reliable communications in high­speed links that are highly sensitive to timing error,
especially those incorporating clock-and-data recovery,
or serializers and deserializers. The high-speed switch­ing performance guarantees 1.5GHz operation and less
than 87ps (max) skew between channels.

LVDS inputs and outputs are compatible with the
TIA/EIA-644 LVDS standard. The LVDS outputs drive
100Ω loads. The MAX9394/MAX9395 are offered in a
32-pin TQFP package and operate over the extended
temperature range (-40°C to +85°C).

Applications

High-Speed Telecom/Datacom Equipment

Central Office Backplane Clock Distribution

DSLAM

Protection Switching

Fault-Tolerant Systems

Features

♦ Guaranteed 1.5GHz Operation with 250mV

Differential Output Swing

♦ Simultaneous Loopback Control

♦ 2ps

(RMS)

(max) Random Jitter

♦ AC Specifications Guaranteed for 150mV

Differential Input

♦ Signal Inputs Accept Any Differential Signaling

Standard

♦ LVDS Outputs for Clock or High-Speed Data

♦ High-Level Input Fail-Safe Detection (MAX9394)

♦ Low-Level Input Fail-Safe Detection (MAX9395)

♦ 3.0V to 3.6V Supply Voltage Range

♦ LVCMOS/LVTTL Logic Inputs

MAX9394/MAX9395

2:1 Multiplexers and 1:2 Demultiplexers with

Loopback

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

0.1μF 0.01μF

3.0V TO

3.6V

OUTA0

OUTA0

LVDS

RECEIVER

INA

INA

ENA0

ENA1

ENB

GNDGND GNDGND

OUTA1

OUTA1

OUTB

OUTB

LVCMOS/LVTTL
LOGIC INPUTS

LB_SELA

LB_SELB

BSEL

INB0

INB0

100Ω

Z0 = 50Ω

Z0 = 50Ω

MAX9394
MAX9395

V

CC

INB1

INB1

Z0 = 50Ω

Z0 = 50Ω

100Ω

Z0 = 50Ω

Z0 = 50Ω

Z0 = 50Ω

Z0 = 50Ω

Typical Operating Circuit

19-2878; Rev 1; 5/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE

PIN­PACKAGE

PKG

CODE

MAX9394EHJ

32 TQFP

H32-1

MAX9394EHJ+

32 TQFP

H32-1

MAX9395EHJ

32 TQFP

H32-1

MAX9395EHJ+

32 TQFP

H32-1

Pin Configurations and Functional Diagram appear at end
of data sheet.

+Denotes a lead-free package.

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX9394/MAX9395

2:1 Multiplexers and 1:2 Demultiplexers with
Loopback

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND...........................................................-0.3V to +4.1V

IN_ _,

IN_ _, OUT_ _, OUT_ _, EN_ _, _SEL, LB_SEL_

to GND........................................................-0.3V to (V

CC

+ 0.3V)

IN_ _ to IN_ _..........................................................................±3V

Short-Circuit Duration (OUT_ _, OUT_ _) ...................Continuous

Continuous Power Dissipation (T

A

= +70°C)

32-Pin TQFP (derate 13.1mW/°C above +70°C)........1047mW

Junction-to-Ambient Thermal Resistance in Still Air

32-Pin TQFP............................................................+76.4°C/W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

ESD Protection (Human Body Model)

(IN_ _, IN_ _, OUT_ _, OUT_ _, EN_ _, SEL_, LB_SEL_) ..±2kV

Soldering Temperature (10s) ...........................................+300°C

DC ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 3.6V, RL= 100Ω ±1%, EN_ _ = VCC, VCM= +0.05V to (VCC- 0.6V) (MAX9394), VCM= +0.06V to (VCC- 0.05V)
(MAX9395), T

A

= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, |VID| = 0.2V, VCM= 1.2V, TA= +25°C.)

(Notes 1, 2, and 3)

PARAMETER

CONDITIONS

UNITS

LVCMOS/LVTTL INPUTS (EN_ _, BSEL, LB_SEL_)

Input High Voltage V

IH

2.0

V

Input Low Voltage V

IL

0 0.8 V

Input High Current I

IH

VIN = 2.0V to V

CC

020µA

Input Low Current I

IL

VIN = 0V to 0.8V 0 10 µA

DIFFERENTIAL INPUTS (IN_ _, IN_ _)

Differential Input Voltage V

ID

V

ILD

>

0V and V

IHD

<

VCC, Figure 1 0.1 3.0 V

MAX9394

VCC -

0.6

Input Common-Mode Range V

CM

MAX9395 0.6

V

CC

-

V

MAX9394 |VID|

<

3.0V -75 10

Input Current

I

IN_ _

,

I

IN_ _ MAX9395 |V

ID

|

<

3.0V -10 100

µA

LVDS OUTPUTS (OUT_ _, OUT_ _)

Differential Output Voltage V

OD

RL = 100Ω, Figure 2 250

450 mV

Change in Magnitude of V

OD

Between Complementary Output
States

ΔV

OD

Figure 2 1.0 50 mV

Offset Common-Mode Voltage V

OS

Figure 2

V

Change in Magnitude of V

OS

Between Complementary Output
States

ΔV

OS

Figure 2 1.0 50 mV

SYM B O L

MIN TYP MAX

0.05

1.125 1.25 1.375

350

V

CC

0.05

MAX9394/MAX9395

2:1 Multiplexers and 1:2 Demultiplexers with

Loopback

_______________________________________________________________________________________ 3

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

30 40

Output Short-Circuit Current
(Output(s) Shorted to GND)

|I

OS

|

V

ID

= ±100mV

(Note 4)

V

OUT_ _

=

V

OUT_ _

= 0V

17 24

mA

Output Short-Circuit Current
(Outputs Shorted Together)

|I

OSB

|

512mA

SUPPLY CURRENT

RL = 100Ω, EN_ _ = V

CC

53 65

Supply Current I

CC

RL = 100Ω, EN_ _ = VCC, switching at
670MHz (1.34Gbps)

53 65

mA

Note 1: Measurements obtained with the device in thermal equilibrium. All voltages referenced to GND except VID, VOD, and ΔVOD.
Note 2: Current into the device defined as positive. Current out of the device defined as negative.
Note 3: DC parameters production tested at T

A

= +25°C and guaranteed by design and characterization for TA= -40°C to +85°C.

Note 4: Current through either output.
Note 5: Guaranteed by design and characterization. Limits set at ±6 sigma.
Note 6: t

SKEW

is the magnitude difference of differential propagation delays for the same output over the same condtions. t

SKEW

=

|t

PHL

- t

PLH

|.

Note 7: Measured between outputs of the same device at the signal crossing points for a same-edge transition under the same con-

ditions. Does not apply to loopback mode.

Note 8: Device jitter added to the differential input signal.

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.0V to 3.6V, RL= 100Ω ±1%, EN_ _ = VCC, VCM= 0.05V to (VCC- 0.6V) (MAX9394), VCM= 0.06V to (VCC- 0.05V)
(MAX9395), T

A

= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, |VID| = 0.2V, VCM= 1.2V, TA= +25°C.)

(Notes 1, 2, and 3)

AC ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 3.6V, fIN< 1.34GHz, t

R_IN

= t

F_IN

= 125ps, RL= 100Ω ±1%, |VID| ≥ 150mV, VCM= 0.075V to (VCC- 0.6V) (MAX9394

only), V

CM

= 0.6V to (VCC- 0.075V) (MAX9395 only), EN_ _ = VCC, TA= -40°C to +85°C, unless otherwise noted. Typical values are

at V

CC

= 3.3V, |VID| = 0.2V, VCM= 1.2V, fIN= 1.34GHz, TA= +25°C.) (Note 5)

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

SEL to Switched Output

Figure 3 1.1 ns

Disable Time to Differential
Output Low

t

PHD

Figure 4 1.7 ns

Enable Time to Differential Output
High

t

PDH

Figure 4 1.7 ns

Switching Frequency f

MAX

VOD

>

250mV 1.5 2.2 GHz

Low-to-High Propagation Delay t

PLH

Figures 1, 5

ps

High-to-Low Propagation Delay t

PHL

Figures 1, 5

ps

Pulse Skew |t

PLH

– t

PHL

|t

SKEW

Figures 1, 5 (Note 6)

86 ps

Output Channel-to-Channel Skew

t

CCS

Figure 6 (Note 7) 16 87 ps

Output Low-to-High Transition
Time (20% to 80%)

t

R

f

IN_ _

= 100MHz, Figures 1, 5

ps

Output High-to-Low Transition
Time (80% to 20%)

t

F

f

IN_ _

= 100MHz, Figures 1, 5

ps

Added Random Jitter t

RJ

f

IN_ _

= 1.34GHz, clock pattern (Note 8) 2

ps

(RMS)

Added Deterministic Jitter t

DJ

1.34Gbps, 223 - 1 PRBS (Note 8) 60 91

ps

P-P

V

VID = ±100mV, V

OUT_ _

OUT_ _

= V

or V

OUT_ _

OUT_ _

(Note 4)

= 0V

t

SWITCH

340 567 720

340 562 720

112 154 187

112 152 187

12.4

MAX9394/MAX9395

2:1 Multiplexers and 1:2 Demultiplexers with
Loopback

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3.3V, |VID| = 0.2V, VCM= +1.2V, TA= +25°C, fIN= 1.34GHz, Figure 5.)

SUPPLY CURRENT vs. TEMPERATURE

MAX9394/95 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

6035-15 10

35

40

45

50

55

60

65

70

30

-40 85

VCC = 3.3V

VCC = 3.6V

VCC = 3.0V

OUTPUT AMPLITUDE vs. FREQUENCY

MAX9394/95 toc02

FREQUENCY (GHz)

OUTPUT AMPLITUDE (mV)

2.00.4 1.2 1.60.8

50

100

150

200

250

300

350

400

0

0 2.4

OUTPUT RISE/FALL TIME

vs. TEMPERATURE

MAX9394/95 toc03

TEMPERATURE (°C)

RISE/FALL TIME (ps)

603510-15

130

140

150

160

170

180

120

-40 85

t

R

t

F

fIN = 100MHz

PROPAGATION DELAY

vs. TEMPERATURE

MAX9394/95 toc04

TEMPERATURE (°C)

PROPAGATION DELAY (ps)

603510-15

510

520

530

540

550

560

570

580

590

600

500

-40 85

MAX9394 DIFFERENTIAL INPUT CURRENT

vs. TEMPERATURE

MAX9394/95 toc05

TEMPERATURE (°C)

INPUT CURRENT (μA)

603510-15

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

-50

-40 85

V

IN_ _

= 3.0V

V

IN_ _

= 0.1V

V

IN_ _

= 0V

MAX9395 DIFFERENTIAL INPUT CURRENT

vs. TEMPERATURE

MAX9394/95 toc06

TEMPERATURE (°C)

INPUT CURRENT (μA)

6035-15 10

10

20

30

40

50

60

70

80

0

-40 85

V

IN_ _

= V

CC

V

IN_ _

= (VCC - 0.1V)

V

IN_ _

= (VCC - 3.0V)

MAX9394

DIFFERENTIAL INPUT CURRENT vs. V

IHD

MAX9394/95 toc07

V

IHD

(V)

INPUT CURRENT (μA)

3.02.40.6 1.2 1.8

-35

-30

-25

-20

-15

-10

-5

0

5

-40
0 3.6

IN_ _ OR
IN_ _ = GND

VCC = 3V

VCC = 3.6V

MAX9395

DIFFERENTIAL INPUT CURRENT vs. V

ILD

MAX9394/95 toc08

V

ILD

(V)

INPUT CURRENT (μA)

3.02.40.6 1.2 1.8

0

10

20

30

40

50

60

70

80

-10
0 3.6

IN_ _ OR
IN_ _ = V

CC

VCC = 3.6V

VCC = 3V

MAX9394/MAX9395

2:1 Multiplexers and 1:2 Demultiplexers with

Loopback

_______________________________________________________________________________________ 5

Pin Description

PIN NAME FUNCTION

1, 2, 3, 30,

31, 32

N.C. No Connection. Not internally connected.

4, 9, 20, 25

GND Ground

5 ENB

Channel B Output Enable. Drive ENB high to enable the LVDS outputs for channel B. An internal 435kΩ
resistor to GND pulls ENB low when unconnected.

6 OUTB

Channel B LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTB and OUTB at
the receiver inputs to ensure proper operation.

7 OUTB

Channel B LVDS Inverting Output. Connect a 100Ω termination resistor between OUTB and OUTB at the
receiver inputs to ensure proper operation.

8, 13, 24,

29

V

CC

Power-Supply Input. Bypass each VCC to GND with a 0.1µF and 0.01µF ceramic capacitor. Install both
bypass capacitors as close to the device as possible, with the 0.01µF capacitor closest to the device.

10 INB0

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Inverting Input. An internal 128kΩ pullup resistor to
V

CC

pulls the input high when unconnected (MAX9394). An internal 68kΩ resistor to GND pulls the input

low when unconnected (MAX9395).

11 INB0

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Noninverting Input. An internal 128kΩ pullup
resistor to VCC pulls the input high when unconnected (MAX9394). An internal 68kΩ resistor to GND
pulls the input low when unconnected (MAX9395).

12

Loopback Select for Channel B Output. Connect LB_SELB to GND or leave unconnected to reproduce
the INB_ (INB_) differential inputs at OUTB (OUTB). Connect LB_SELB to V

CC

to loop back the INA (INA)

differential inputs to OUTB (OUTB). An internal 435kΩ resistor to GND pulls LB_SELB low when
unconnected.

14 INB1

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Inverting Input. An internal 128kΩ pullup resistor to
V

CC

pulls the input high when unconnected (MAX9394). An internal 68kΩ resistor to GND pulls the input

low when unconnected (MAX9395).

15 INB1

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Noninverting Input. An internal 128kΩ pullup
resistor to VCC pulls the input high when unconnected (MAX9394). An internal 68kΩ resistor to GND
pulls the input low when unconnected (MAX9395).

16 BSEL

Channel B Multiplexer Control Input. Selects the differential input to reproduce at the B channel
differential output. Connect BSEL to GND or leave unconnected to select the INB0 (INB0) set of inputs.
Connect BSEL to V

CC

to select the INB1 (INB1) set of inputs. An internal 435kΩ resistor to GND pulls

BSEL low when unconnected.

17 ENA1

Channel A1 Output Enable. Drive ENA1 high to enable the A1 LVDS outputs. An internal 435kΩ resistor
to GND pulls the ENA1 low when unconnected.

18

Channel A1 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTA1 and OUTA1 at
the receiver inputs to ensure proper operation.

19

Channel A1 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTA1 and
OUTA1 at the receiver inputs to ensure proper operation.

LB_SELB

OUTA1

OUTA1