844201 Datasheet, PDF (1/16 Pages) Integrated Device Technology – FemtoClock Crystal-to-LVDS Clock Generator

FemtoClock^® Crystal-to-LVDS
Clock Generator
ICS844201-45
DATASHEET
General Description
The ICS844201-45 is a PCI Express^TM Clock Generator. The
ICS844201-45 can synthesize 100MHz or 125MHz reference clock
frequencies with a 25MHz crystal. The ICS844201-45 has excellent
phase jitter performance and is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
Features
• One differential LVDS output
• Crystal oscillator interface designed for 18pF,
25MHz parallel resonant crystal
• VCO range: 490MHz – 680MHz
• RMS phase jitter at 100MHz (12kHz – 20MHz): 0.792ps (typical)
• RMS phase jitter at 125MHz (12kHz – 20MHz): 0.773ps (typical)
• Full 3.3V output supply mode
• PCI Express (2.5Gb/s) and Gen 2 (5Gb/S) jitter compliant
• 0°C to 70°C ambient operating temperature
• Lead-free (RoHS 6) packaging
Frequency Table
Crystal Frequency (MHz)
Inputs
M
FSEL
N
Multiplication Value M/N
Output Frequency Range
(MHz)
25
20
1
4
5
125 (default)
25
20
0
5
4
100
Block Diagram
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
N = ÷5
÷4 (default)
FSEL ^Pullup
M = ÷20 (fixed)
Pin Assignment
Q
GND 1
8Q
nQ
XTAL_OUT 2
7 nQ
XTAL_IN 3
6 VDD
FSEL 4
5 ^nc
ICS844201-45
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mmpackage body
G Package
Top View
ICS844201BG-45 REVISION A OCTOBER 1, 2013
1
©2013 Integrated Device Technology, Inc.