843022AG www.icst.com/products/hiperclocks.html REV. A NOVEMBER 30, 2004
1
Integrated
Circuit
Systems, Inc.
ICS843022
FEMTOCLOCKS™ C RYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
PRELIMINARY
GENERAL DESCRIPTION
The ICS843022 is a Fibre Channel Clock Generator
and a member of the HiPerClocks
TM
family of high
performance devices from ICS. The ICS843022
uses a 25MHz crystal to synthesize 125MHz or
62.5MHz. The ICS843022 has excellent phase
jitter performance, over the 12KHz – 20MHz integration range.
The ICS843022 is packaged in a small 8-pin TSSOP, making
it ideal for use in systems with limited board space.
FEATURES
• 1 differential 3.3V LVPECL output
• Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
• Output frequencies: 125MHz or 62.5MHz (selectable)
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(12KHz - 20MHz): 0.62ps (typical)
• RMS phase noise at 125MHz (typical)
Offset Noise Power
100Hz ............... -94.6 dBc/Hz
1KHz ..............-122.8 dBc/Hz
10KHz ..............-132.2 dBc/Hz
100KHz ..............-132.0 dBc/Hz
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
HiPerClockS™
ICS
ICS843022
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
VCCA
VEE
XTAL_OUT
XTAL_IN
1
2
3
4
VCC
Q0
nQ0
FREQ_SEL
8
7
6
5
OSC
Output
Divider
BLOCK DIAGRAM PIN ASSIGNMENT
XTAL_IN
XTAL_OUT
nQ0
Q0
FREQ_SEL
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LES_QERF
0zHM521
1zHM5.26
FUNCTION TABLE
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.