ICS9112-43 Datasheet, PDF (1/5 Pages) Integrated Circuit Systems – Frequency Generator for Gigabit Ethernet Systems

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
±100 ppm frequency accuracy using a standard AT crystal
with external load capacitors (typically 33pF±5% for an
18pF load crystal). Achieving ±100 ppm over four years
requires the crystal to have a ±20 ppm initial accuracy, ±30
ppm temperature and ±5 ppm/year aging coefficients.
The ICS9112-43/44 with less than 50ps accumulative jitter
is well suited for Gigabit Ethernet applications.
Features
• Generates 125 MHz clocks from a 20 MHz crystal
• Less than 45ps one sigma jitter (15ps typ.)
• Less than ±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
• 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.