Microchip SY89825U Bedienungsanleitung


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M9999-011907
hbwhelp@micrel.com or (408) 955-1690
FEATURES
■LVPECL or LVDS input to 22 LVPECL outputs
■100K ECL compatible outputs
■LVDS input includes 100Ω termination
■Guaranteed AC parameters over voltage:
•> 2GHz fMAX (toggle)
•< 35ps max. ch-ch skew
■Low voltage operation: 2.5V, 3.3V
■Temperature range:–40°C to +85°C
■Output enable pin
■Available in a 64-Pin EPAD-TQFP
The SY89825U is a High Performance Bus Clock Driver
with 22 differential LVPECL output pairs. This part is
designed for use in low voltage (2.5V, 3.3V) applications
which 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 by the
CLK_SEL pin. The LVDS input includes a 100 internalΩ
termination, thus eliminating the need for external
termination. The Output Enable (OE) is synchronous so
that the outputs will only be enabled/disabled when they
are already in the LOW state. This eliminates any chance
of generating a runt clock pulse when the device is enabled/
disabled as can happen with an asynchronous control.
The SY89825U features low pin-to-pin skew (35ps max.)
—performance previously unachievable in a standard
product having such a high number of outputs. The
SY89825U is available in a single space saving package
which provides a lower overall cost solution. In addition, a
single chip solution improves timing budgets by eliminating
the multiple device solution with their corresponding large
part-to-part skew.
2.5/3.3V 1:22 HIGH-PERFORMANCE,
LOW-VOLTAGE PECL BUS CLOCK DRIVER
& TRANSLATOR w/ INTERNAL TERMINATION
DESCRIPTION
Precision Edge®
SY89825U
APPLICATIONS
■High-performance PCs
■Workstations
■Parallel processor-based systems
■Other high-performance computing
■Communications
Rev.: DAmendment: /0
Issue Date:
January 2007
Precision Edge®
Precision Edge is a registered trademark of Micrel, Inc.

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Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89825U

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