SY89829U Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 2.5V/3.3V HIGH-PERFORMANCE, DUAL 1:10 OR LVPECL CLOCK DRIVER w/ INTERNAL TERMINATION AND REDUNDANT SWITCHOVER

Micrel, Inc.
2.5V/3.3V HIGH-PERFORMANCE, DUAL 1:10
OR LVPECL CLOCK DRIVER w/ INTERNAL
Precision Edge^®
Precision E^Sd^Y8g⁹e^8®29U
TERMINATION AND REDUNDANT SWITCHOVER ^SY89829U
FEATURES
s Dual 1:10 fanout buffer/translator
s Accepts LVPECL or LVDS inputs
s Multiplexed inputs ideal for redundant clock
switchover
s Guaranteed AC parameters:
• > 2GHz f_MAX (toggle)
• < 50ps ch-ch skew
s LVDS input includes 100Ω internal termination
s Low supply voltage: 2.5V, 3.3V
s –40°C to +85°C temperature range
s Output enable (OE) pin
s Available in 64 EPAD-TQFP
APPLICATIONS
s High-performance PCs
s Workstations
s Parallel processor-based systems
s Other high-performance computing
s Communications
s Redundant LVPECL or LVDS bus clock switchover
Precision Edge^®
DESCRIPTION
The SY89829U is a High Performance dual 1:10 or
single 1:20 LVPECL Clock Driver. The 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 inputs include a 100Ω internal termination across
the input pair, thus eliminating any need for external
termination. The 2:1 input mux makes this device an ideal
choice for redundant clock applications that need to switch
between two reference clocks. 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 SY89829U features low pin-to-pin skew (50ps max.)
and low part-to-part skew (200ps max.)—performance
previously unachievable in a standard product having such
a high number of outputs. The SY89829U 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