Datasheet SY55858U Datasheet (Micrel)

Micrel, Inc.

2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML
CROSSPOINT SWITCH

W/INTERNAL TERMINATION

FEATURES

■ Guaranteed AC parameters over temperature:

•f

•tr/ tf < 120ps

• Within-device skew < 25ps

■ Non-blocking “switch architecture”

■ Configurable as dual 2:1 mux, dual 1:2 fanout buffer,

1:4 fanout buffer, quad buffer, or dual 2 x 2 switch

■ 50Ω compatible outputs

■ Unique input termination and VT pin for DC-coupled

and AC-coupled input signals–CML or PECL

■ Fully differential inputs/outputs

■ TTL/CMOS compatible control logic

■ Wide supply voltage range: 2.3V to 3.6V

■ Wide operating temperature range: –40°C to +85°C

■ Available in 32-pin EPAD-TQFP package

> 3.0GHz (3Gbps)

MAX

SuperLite™

SuperLite™

SY55858U

SY55858U

SuperLite™

DESCRIPTION

The SY55858U is a low-voltage, high-speed dual 2 x 2
crosspoint switch with a flexible input that accepts CML
or PECL, and a 50Ω compatible differential CML (current­mode logic) output. The non-blocking design allows any
input to connect to any output. Varying the state of the
select inputs allows SY55858U to be used in backup,
fault tolerant, protection and backplane distribution
applications.

The signal inputs (DA
internal termination design that allows access to the
termination network through VT pins. This feature allows
the device to easily interface to other logic standards
such as AC-coupled or DC-coupled PECL/LVPECL
signals. For applications that require a single-channel
2 x 2 crosspoint, consider the SY55854.

and DB

0–1

) have a unique

0–1

APPLICATIONS

■ SONET/SDH optical transport

■ Backplane redundancy

■ Add-drop Multiplexers

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1

Rev.: D Amendment: /0
Issue Date: November 2005

Micrel, Inc.

/

/

PACKAGE/ORDERING INFORMATION

SuperLite™

SY55858U

(1)

Package Operating Package Lead

H32-1 Industrial SY55858UHI Sn-Pb
H32-1 Industrial SY55858UHG with Pb-Free

Pb-Free bar-line indicator NiPdAu

H32-1 Industrial SY55858UHG with Pb-Free

Pb-Free bar-line indicator NiPdAu

VTA1

/DA1

SELA0

DA1

SELA1

/DA0

VTA0

32 31 30 29 28 27 26 25

DB1

1

VTB1

2
3

/DB1

SELB0

DB0

VTB0

/DB0

SELB1

Top View

4

EPAD-TQFP

5
6
7
8

H32-1

910111213141516

GND

VCC

QB0

QB0

VCC

QB1

QB1

32-Pin EPAD-TQFP (H321)

DA0

24
23
22
21
20
19
18
17

VCC

GND
VCC
QA0

/QA0
VCC
QA1

/QA1

VCC

Ordering Information

Part Number Type Range Marking Finish

SY55858UHI H32-1 Industrial SY55858UHI Sn-Pb
SY55858UHITR
SY55858UHG

SY55858UHGTR

Notes:

1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.

2. Tape and Reel.

(2)

(3)

(2, 3)

3. Pb-Free package recommended for new designs.

TRUTH TABLES

SELA0 SELA1 QA0 QA1 Function

0 0 DA0 DA0 Fanout Buffer or Redundant Distribution
0 1 DA0 DA1 Dual Buffer or Crosspoint
1 0 DA1 DA0 Dual Buffer or Crosspoint
1 1 DA1 DA1 Fanout Buffer or Redundant Distribution

Table 1. Input to Output Connectivity Crosspoint A

SELB0 SELB1 QB0 QB1 Function

0 0 DB0 DB0 Fanout Buffer or Redundant Distribution
0 1 DB0 DB1 Dual Buffer or Crosspoint
1 0 DB1 DB0 Dual Buffer or Crosspoint
1 1 DB1 DB1 Fanout Buffer or Redundant Distribution

Table 2. Input to Output Connectivity Crosspoint B

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PIN DESCRIPTION

Pin Number Pin Name Pin Function

1 DB1 Channel B1 posititve signal input.
2 VTB1 Channel B1 termination center-tap. For CML inputs, leave this pin floating.

Otherwise, see Figures 5a–5d in “Input Interface Application” section.
3 /DB1 Channel B1 negative signal input.
4 SELB0 Channel B0 output select. TTL/CMOS input.
5 DB0 Channel B0 positive signal input.
6 VTB0 Channel B0 termination center-tap. For CML inputs, leave this pin floating.

Otherwise, see Figures 5a–5d in “Input Interface Application” section.
7 /DB0 Channel B0 negative signal input.
8 SELB1 Channel B1 output select. TTL/CMOS input.

9, 24 GND Supply Ground.

10, 13, 16, 17, 20, 23 VCC Positive supply normally connect to 2.5V, 3.3V, or 5V nominal supply, and

bypass each pin with 0.1µF//0.01µF low ESR capacitors.

11 /QB0 Channel B0 negative signal output. 50Ω CML.
12 QB0 Channel B0 positive signal output. 50Ω CML.
14 /QB1 Channel B1 negative signal output. 50Ω CML.
15 QB1 Channel B1 positive signal output. 50Ω CML.
18 /QA1 Channel A1 negative signal output. 50Ω CML.
19 QA1 Channel A1 positive signal output. 50Ω CML.
21 /QA0 Channel A0 negative signal output. 50Ω CML.
22 QA0 Channel A0 positive signal output. 50Ω CML.
25 DA0 Channel A0 positive signal input.
26 VTA0 Channel A0 termination center-tap. For CML inputs, leave this pin floating.

Otherwise, see Figures 5a–5d in “Input Interface Application” section.

27 /DA0 Channel A0 negative signal input.
28 SELA1 Channel A1 output select. TTL/CMOS input.
29 DA1 Channel A1 positive signal input.
30 VTA1 Channel A1 termination center-tap. For CML inputs, leave this pin floating.

Otherwise, see Figures 5a–5d in “Input Interface Application” section.

31 /DA1 Channel A1 negative signal input.
32 SELA0 Channel A1 output select. TTL/CMOS input.

SY55858U

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FUNCTIONAL BLOCK DIAGRAM

SuperLite™

SY55858U

DA0

/DA0

SELA0

DA1

/DA1

SELA1

DB0

/DB0

SELB0

DB1

/DB1

SELB1

TA0

TA1

50Ω
50Ω

50Ω
50Ω

50Ω
50Ω

50Ω
50Ω

0

A0

CML

1

0

A1

CML

1

0

B0

CML

1

0

B1

CML

1

QA0

/QA0

QA1

/QA1

QB0

/QB0

QB1

/QB1

V

V

V

TB0

V

TB1

INPUT AND OUTPUT STAGE

V

CC

D0

50Ω

*

V

T

/D0

Figure 1. Input Stage

Note 1. See “Input Interface Applications” section for proper input

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connection.

1.2mA

50Ω

1.2mA

SY55858U

v

cc

50Ω 50Ω

16mA

SY55858U

Q

/Q

Figure 2. Output Stage

4

Micrel

SuperLite™

SY55858U

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Value Unit

V
V
V
T
T
T

θ

CC
IN
OUT
A
LEAD
store

JA

Power Supply Voltage –0.5 to +6.0 V
Input Voltage –0.5 to V

+0.5 V

CC

CML Output Voltage VCC –1.0 to VCC +0.5 V
Operating Temperature Range –40 to +85 °C
Lead Temperature (soldering, 20sec.) 260 °C
Storage Temperature Range –65 to +150 °C
Package Thermal Resistance –Still-Air (multi-layer PCB) 28 °C/W

(Junction-to-Ambient) –500lfpm (multi-layer PCB) 20 °C/W

θ

JC

Package Thermal Resistance 4 °C/W
(Junction-to-Case)

Note 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not

implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions
for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min. Typ. Max. Unit Condition

V

CC

I

CC

Power Supply Voltage 2.3 — 3.6 V
Power Supply Current — 150 190 mA No load, over temp.

TTL CONTROL ELECTRICAL CHARACTERISTICS

VCC = 2.3V to 3.6V; GND = 0V; TA = –40°C to +85°C

Symbol Parameter Min. Typ. Max. Unit Condition

V

IH

V

IL

I

IH

I

IL

Note 2. Specifications are guaranteed after thermal equilibrium has been establised.

Input HIGH Voltage 2.0 ——V
Input LOW Voltage ——0.8 V
Input HIGH Current ——+20 µAVIN = 2.7V, VCC = Max.

——+100 µAVIN = VCC, VCC = Max.

Input LOW Current –300 ——µAVIN = 0.5V, VCC = Max.

(2)

5

SuperLite™

Micrel, Inc.

SY55858U

CML DC ELECTRICAL CHARACTERISTICS

VCC = 2.3V to 3.6V; GND = 0V; TA = –40°C to +85°C

Symbol Parameter Min. Typ. Max. Unit Condition

V

ID

R

IN

V

IH

V

IL

V

OH

V

OL

V

OUT(SWING)

R

OUT

Note 3. Device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is

Note 4. V

Differential Input Voltage 100 ——mV
Differential Input Resistance

D-to-/D 90 100 110 Ω
Input HIGH Voltage 1.6 — V
Input LOW Voltage 1.5 — VCC – 0.1 V
Output HIGH Voltage VCC – 0.040 VCC – 0.010 V
Output LOW Voltage VCC – 1.00 VCC – 0.800 VCC – 0.650 V No Load
Output Voltage Swing

(4)

0.650 0.800 1.00 V No Load

Output Source Impedance 40 50 60 Ω

tested in a socket such that traverse airflow ≥500lfpm is maintained.

OUT(SWING)

purposes is 2 ×V
swing is available in the 50Ω environment. Refer to the “CML Output Termination Application” section, Figures 3 and 4, for more details.

is defined as the swing on one output of a differential pair, that is |VOH – VOL| on one pin. The swing for common mode immunity

OUT(SWING)

. Actual voltage levels and differential swing will depend on customer termination scheme. Typically, a 400mV

(3)

CC

CC

V

V No Load

— 0.400 — 50Ω Environment

AC ELECTRICAL CHARACTERISTICS

VCC = 2.3V to 3.6V; GND = 0V; TA = –40°C to +85°C

Symbol Parameter Min. Typ. Max. Unit Condition

f

MAX

t

PLH

t

PHL

t

SWITCH

t

SKEW

R

J

D

J

tr, t

f

Note 5. Tested using environment of Figure 3, 50Ω equivalent load. AC parameters are guaranteed by design and characterization.
Note 6. f

Note 7. Input TTL/CMOS edge rate of <1.5ns.
Note 8. Worst-case difference between QA0 and QA1 from either DA0 or DA1 (or between QB0 and QB1 from either DB0 or DB1 respectively), when

Note 9. Worst-case difference between QA and QB outputs, when DA or DB inputs are shorted.

Maximum Frequency

NRZ Data Rate 3.0 ——Gbps

Clock Frequency

(6)

3.0 ——GHz

Differential Propagation Delay 220 350 450 ps

D-to-Q

(8)
(9)

(7)

— 0.50 1.0 ns
— 12 25 ps

— 25 50 ps

Select-to-Valid Output
Within-Device Skew

Within-Device Skew
Part-to-Part Skew (Diff.) — 100 —

Random Jitter — 25ps
Deterministic Jitter — 520ps
CML Output Rise/Fall Times — 80 120 ps

(20% to 80%)

clock is defined as the maximum toggle rate the device can operate while still achieving a 250mV minimum CML output swing, 50Ω

MAX

equivalent load.

both outputs come from the same input.

(5)

RMS

PP

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T

CML OUTPUT TERMINATION APPLICATION

SuperLite™

SY55858U

All CML inputs accept a CML output from any other

member of this family. All CML outputs are source terminated

v

cc

50Ω 50Ω

16mA

SY55858U

50Ω

100Ω

50Ω

Figure 3. 50Ω Output Termination

INPUT INTERFACE APPLICATIONS

50Ω differential drivers as shown in Figure 3.

+

Q

OUT

400mV
(Single-Ended)

/Q

OUT

Q

OUT

800mV
(Q

OUT — /QOU

Differential

/Q

OUT

Figure 4. Output Levels

V

CC

CML

V

D

/D

VTNC

CC

SY55858

Figure 5a. CML-to-CML

(DC-Coupled) Input Interface

V

CC

PECL

VCC – 2.0V

V

D

/D

SY55858

VT

CC

V

CC

CML

VCC – 1.3V

V

D

/D

SY55858

VT

CC

Figure 5b. CML-to-CML

(AC-Coupled) Input Interface

V

CC

PECL

220Ω220Ω

VCC – 1.3V

V

D

/D

SY55858

VT

CC

Figure 5c. PECL-to-CML

(DC-Coupled) Input Interface

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Figure 5d. PECL-to-CML

(AC-Coupled) Input Interface

7

Micrel, Inc.

32 -PIN EPAD-TQFP (DIE UP) (H32-1)

SuperLite™

SY55858U

Rev. 01

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify

TEL + 1 [phone] FAX + 1 [phone] WEB http://www.micrel.com

Micrel for any damages resulting from such use or sale.

© 2005 Micrel, Incorporated.

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