SY89228U
1GHz Precision, LVPECL Г 3, Г 5 Clock Divider
with Fail-Safe Input and Internal Termination General Description
The SY89228U is a precision, low jitter 1GHz Г 3, Г 5
clock divider with an LVPECL output. A unique FailSafe Input (FSI) protection prevents metastable
output conditions when the input clock voltage swing
drops significantly below 100mV or input is removed.
The differential input includes Micrel’s unique, 3-pin
internal termination architecture that allows the input
to interface to any differential signal (AC-or DCcoupled) as small as 100mV (200mVPP) without any
level shifting or termination resistor networks in the
signal path. The outputs are 800mV, 100Kcompatible LVPECL with fast rise/fall times
guaranteed to be less than 270ps.
The SY89228U operates from a 2.5V В±5% or 3.3V
В±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. The
SY89228U is part of Micrel’s high-speed, Precision
В®
Edge product line.
All support documentation can be found on Micrel’s
web site at: www.micrel.com. Block Diagram Precision Edge В® Features Accepts a high-speed input and provides a precision
Г 3 and Г 5 sub-rate, LVPECL output Fail-Safe Input
– Prevents oscillations when input is invalid Guaranteed AC performance over temperature and …