
FEMTOCLOCKS CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
ICS843001
IDT / ICS 3.3V LVPECL CLOCK GENERATOR
1
ICS843001AG REV B March 2, 2009
GENERAL DESCRIPTION
The ICS843001 is a Fibre Channel Clock Generator
and a member of the HiPerClocksTM family of high
performance devices from IDT. The ICS843001
uses either a 26.5625MHz or a 23.4375 crystal to
synthesize 106.25MHz, 187.5MHz or 212.5MHz,
using the FREQ_SEL pin. The ICS843001 has excellent <1ps
phase jitter performance, over the 637kHz – 10MHz integration
range. The ICS843001 is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
FEATURES
One differential 3.3V LVPECL output
Crystal oscillator interface designed for 23.4375MHz or
26.5625MHz, 18pF parallel resonant crystal
Selectable 106.25MHz, 187.5MHz or 212.5MHz
output frequency
VCO range: 560MHz - 680MHz
RMS phase jitter @ 106.255MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.74ps (typical)
RMS phase noise at 106.25MHz
Phase noise:
Offset
Noise Power
100Hz ............... -95.2 dBc/Hz
1KHz ............. -118.7 dBc/Hz
10KHz ............. -129.1 dBc/Hz
100KHz ............. -129.6 dBc/Hz
3.3V operating supply
-30°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
HiPerClockS
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FUNCTION TABLE
ICS843001
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
Phase
Detector
VCO
637.5MHz w/
26.5625MHz Ref.
M = ÷24 (fixed)
1
0
÷6
÷3
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
XTAL_OUT
nQ0
Q0
FREQ_SEL
(Pulldown)