SY55858U datasheet(1/8 Pages) MICREL | 2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION

Part No.	SY55858U

Description	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION

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Manufacturer	MICREL [Micrel Semiconductor]

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SuperLite™

SY55858U

Micrel

DESCRIPTION

s Guaranteed AC parameters over temperature:

•f

MAX > 3.0GHz (3Gbps)

•t

r/ tf < 120ps

• Within-device skew < 25ps

s Non-blocking “switch architecture”

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

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

s 50

Ω compatible outputs

s Unique input termination and V

T pin for DC-coupled

and AC-coupled input signals–CML or PECL

s Fully differential inputs/outputs

s TTL/CMOS compatible control logic

s Wide supply voltage range: 2.3V to 3.6V

s Wide operating temperature range: –40

°C to +85°C

s Available in 32-pin EPAD-TQFP package

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 50

Ω compatible differential CML (current-

mode 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

0–1 and DB0–1) have a unique

internal termination design that allows access to the

termination network through V

T 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.

FEATURES

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

CROSSPOINT SWITCH

W

/INTERNAL TERMINATION

SuperLite™

SY55858U

APPLICATIONS

s SONET/SDH optical transport

s Backplane redundancy

s Add-drop Multiplexers

Rev.: C

Amendment: /1

Issue Date:

September2003

SuperLite is a trademark of Micrel, Inc.

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9

1011 12 131415 16

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

DB1

VTB1

/DB1

SELB0

DB0

VTB0

/DB0

SELB1

GND

VCC

QA0

/QA0

VCC

QA1

/QA1

VCC

Top View

EPAD-TQFP

H32-1

PIN CONFIGURATION

SuperLite™

Similar Part No. - SY55858U

Manufacturer	Part No.	Datasheet	Description
Micrel Semiconductor	SY55858U	76Kb / 8P	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION
	SY55858UHG	76Kb / 8P	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION
	SY55858UHGTR	76Kb / 8P	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION
	SY55858UHI	76Kb / 8P	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION
	SY55858UHITR	76Kb / 8P	2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION

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