Microchip SY89828L Bedienungsanleitung

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Precision Edge

®

SY89828L

MicreL, Inc.

M9999-012208

[email protected] or (408) 955-1690

DESCRIPTION

■High-performance dual 1:10, 1GHz LVDS fanout

buffer/translator

■Two banks of 10 differential LVDS outputs

■Guaranteed AC parameters over temperature and

voltage:

•> 1GHz f

MAX

•< 50ps within device skew

•< 400ps t

r

, t

f

time

■Each bank includes a 2:1 input mux

■2:1 mux input accepts LVDS and LVPECL

■Low jitter performance

•< 1ps

RMS

cycle-to-cycle jitter

•< 1ps

PP

total jitter

■3.3V supply voltage

■Output enable function

■LVDS input includes internal 100Ω termination

■Available in a 64-Pin EPAD-TQFP

FEATURES

3.3V 1GHz DUAL 1:10 PRECISION

LVDS FANOUT BUFFER/

TRANSLATOR WITH 2:1 INPUT MUX

Precision Edge

®

SY89828L

APPLICATIONS

■Enterprise networking

■High-end servers

■Communications

Rev.: DAmendment: /0

Issue Date:January 2008

The SY89828L is a precision fanout buffer with 20

differential LVDS (Low Voltage Differential Swing) output

pairs. The part is designed for use in low voltage 3.3V

applications that require a large number of outputs to drive

precisely aligned, ultra low-skew signals to their destination.

The input is multiplexed from either LVDS or LVPECL (Low

Voltage Positive Emitter Coupled Logic) by the CLK_SEL1

and CLK_SEL2 pins. The Output Enables (OE1 and OE2)

are synchronous so that the outputs will only be enabled/

disabled when they are already in the LOW state. This

avoids any chance of generating a runt clock pulse when

the device is enabled/disabled as can happen with an

asynchronous control.

The SY89828L features a low pin-to-pin skew of less

than 50ps—performance previously unachievable in a

standard product having such a high number of outputs.

The SY89828L is available in a single space saving package,

enabling a lower overall cost solution.

TYPICAL APPLICATION CIRCUIT

SEL1

Primary/Backup Clock Select

(Switchover with 2.0ns)

LVDS_CLKA

/LVDS_CLKA

LVDS_CLKB

/LVDS_CLKB

Primary Clock Source

Backup Clock Source

5

5

5

5

100Ω

100Ω

Primary

Card

Redundant

Card

System using SY89828L as a switchover circuit from a Primary Clock to a Redundant backup Clock in a fail-safe application.

LVPECL inputs not shown in this application.

Precision Edge is a registered trademark of Micrel, Inc.

Precision Edge

®

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