CRYSTAL-TO- LVDS CLOCK GENERATOR
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PRELIMINARY
Integrated Circuit Systems, Inc.
ICS844031I-01
FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK G...
Description
www.DataSheet4U.com
PRELIMINARY
Integrated Circuit Systems, Inc.
ICS844031I-01
FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR
F EATURES
(1) Differential LVDS output Crystal oscillator interface, 18pF parallel resonant crystal (19.6MHz - 27.2MHz) Output frequency range: 245MHz - 340MHz VCO range: 490MHz - 680MHz RMS phase jitter @ 312.5MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.49ps (typical) 3.3V or 2.5V operating supply -40°C to 85°C ambient operating temperature
GENERAL DESCRIPTION
The ICS844031I-01 is an Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS844031I-01 uses an 18pF parallel resonant crystal over the range of 19.6MHz - 27.2MHz. For Ethernet applications, a 25MHz crystal is used to generate 312.5MHz. The ICS844031I-01 has excellent <1ps phase jitter performance, over the 1.875MHz - 20MHz integration range. The ICS844031I-01 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.
ICS
COMMON CONFIGURATION TABLE
Inputs Crystal Frequency (MHz) 25 M 25 N 2 Multiplication Value M/N 12.5 Output Frequency (MHz) 312.5
BLOCK DIAGRAM
OE Pullup
PIN ASSIGNMENT
VDDA GND XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q nQ OE
XTAL_IN
OSC
XTAL_OUT
Phase Detector
VCO
490MHz - 680MHz
N = ÷2 (fixed)
Q nQ
ICS844031I-01
8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View
M = ÷25 (fixed)
The Preliminary Information presented her...
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