ICS843023 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – 3.3V, 250MHZ LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843023
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V, 250MHZ LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS843023 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from ICS. The}
ICS843023 uses a 25MHz crystal to synthesize
250MHz. The ICS843023 has excellent phase jitter
performance, over the 1.875MHz – 20MHz integration range.
The ICS843023 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
• Maximum output frequency: 250MHz, using a 25MHz crystal
• VCO range: 490MHz - 640MHz
• RMS phase jitter @ 250MHz, using a 25MHz crystal
(12KHz - 20MHz): 0.33ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM
OE
XTAL_IN
XTAL_OUT
25MHz
OSC
Phase
Detector
VCO
÷20
(fixed)
÷2
(fixed)
PIN ASSIGNMENT
VCC 1
8 Q0
XTAL_OUT 2
7 nQ0
XTAL_IN 3
6 VCC
Q0
VEE 4
5 OE
nQ0
ICS843023
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.
843023AG
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 30, 2004
1