Integrated
Circuit
Systems, Inc.
ICS9112-43/44
Preliminary Product Preview
Frequency Generator for Gigabit Ethernet Systems
General Description
The
ICS9112-43/44
is a high speed clock generator designed
to support Gigabit Ethernet system requirements. The
ICS9112-43/44
generates 125 MHz from a 20 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
ICS9112-43/44
with less than 50ps accumulative jitter
is well suited for Gigabit Ethernet applications.
Features
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Generates 125 MHz clocks from a 20 MHz crystal
Less than 45ps one sigma jitter (15ps typ.)
Less than 鹵130ps absolute jitter
Less than 50ps 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 Gigabit Ethernet systems.
Block Diagram
9112-43 9112-44 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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