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 100 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.: D Amendment: /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
100
100
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
®


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89828L

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