SY89825U_07 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 2.5/3.3V 1:22 HIGH-PERFORMANCE, LOW-VOLTAGE PECL BUS CLOCK DRIVER & TRANSLATOR w/ INTERNAL TERMINATION

Micrel, Inc.
2.5/3.3V 1:22 HIGH-PERFORMANCE,
LOW-VOLTAGE PECL BUS CLOCK DRIVER
Precision Edge^®
Precision E^Sd^Y8g⁹e^8®25U
& TRANSLATOR w/ INTERNAL TERMINATION
SY89825U
FEATURES
s LVPECL or LVDS input to 22 LVPECL outputs
s 100K ECL compatible outputs
s LVDS input includes 100Ω termination
s Guaranteed AC parameters over voltage:
• > 2GHz f_MAX (toggle)
• < 35ps max. ch-ch skew
s Low voltage operation: 2.5V, 3.3V
s Temperature range: –40°C to +85°C
s Output enable pin
s Available in a 64-Pin EPAD-TQFP
APPLICATIONS
s High-performance PCs
s Workstations
s Parallel processor-based systems
s Other high-performance computing
s Communications
Precision Edge^®
DESCRIPTION
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 100Ω internal
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.
Precision Edge is a registered trademark of Micrel, Inc.
M9999-011907
[e-mail] or [phone]
1
Rev.: D Amendment: /0
Issue Date: January 2007