Integrated
Circuit
Systems, Inc.
ICS9112-33/34
Preliminary Product Preview
Frequency Generator for Fibre Channel Systems
General Description
The
ICS9112-33/34
are high-speed clock generators designed
to support fibre channel system requirements. The
ICS9112-
33/34
generates 106.25 MHz from a 21.25 MHz crystal.
An exact frequency multiplying ratio ensures better than
鹵100 ppm frequency accuracy using a standard AT crystal
with external load capacitors (typically 33pF鹵5% for an
18pF load crystal). Achieving 鹵100 ppm over four years
requires the crystal to have a 鹵20 ppm initial accuracy, 鹵30
ppm temperature and 鹵5 ppm/year aging coefficients.
The
ICS9112-33/34
with less than 25ps accumulative jitter
is well suited for Fibre Channel applications.
Crystal:
EC-21.25M (Ecliptek)
Features
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Generates 106.25 MHz clocks from a 21.25 MHz
crystal
Less than 45ps one sigma jitter (10ps typ.)
Less than 鹵130ps absolute jitter
Less than 25ps accumulative jitter @ 256 cycles
Rise/fall times less than 1.2ns driving 15pF
On-chip loop filter components
3.0V-5.5V supply range
8-pin, 150-mil SOIC package
Applications
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Specifically designed to support the high-speed
clocking requirements of fibre channel systems.
Block Diagram
ICS9112-33/34 Rev D 3/3/99
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.
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