ICS843022 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843022
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS843022 is a Fibre Channel Clock Generator
and a member of the HiPerClocks^TM family of high
HiPerClockS™ _{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
FUNCTION TABLE
Inputs
FREQ_SEL
0
1
Output Frequencies
(with a 25MHz crystal)
125MHz
62.5MHz
BLOCK DIAGRAM
XTAL_IN
XTAL_OUT
OSC
Output
Divider
FREQ_SEL
PIN ASSIGNMENT
nQ0
Q0
VCCA 1
VEE 2
XTAL_OUT 3
XTAL_IN 4
8 VCC
7 Q0
6 nQ0
5 FREQ_SEL
ICS843022
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
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.
843022AG
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 30, 2004
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