ICS843SDN Datasheet, PDF (1/14 Pages) Integrated Device Technology – FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR

FEMTOCLOCK™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
General Description
The ICS843SDN is a Gigabit Ethernet Clock
ICS
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from IDT. The}
ICS843SDN uses a 24MHz crystal to synthesize
120MHz. The ICS843SDN uses IDT’s 3^rd generation
low phase noise VCO technology, and can achieve <1ps rms
phase jitter performance over the 12kHz – 20MHz integration
range. The ICS843SDN is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
ICS843SDN
Features
• One differential 3.3V LVPECL output
• Crystal oscillator interface designed for 23.2MHz – 30MHz,
18pF parallel resonant crystal
• Output frequency range: 116MHz – 150MHz
• VCO range: 580MHz – 750MHz
• Output duty cycle range: 47% – 53%
• RMS phase jitter @ 120MHz, using a 24MHz crystal
(12kHz – 20MHz): 0.81ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Available in lead-free (RoHS 6) package
Table 1. Frequency Table - Typical Applications
Crystal Frequency (MHz)
Output Frequency (MHz)
25
125
24
120
Block Diagram
25MHz
XTAL_IN
OSC
Phase
VCO
÷5
Detector
XTAL_OUT
÷25
(fixed)
Pin Assignment
VCCA 1
8 VCC
Q
VEE 2
7Q
nQ
XTAL_OUT 3
6 nQ
XTAL_IN 4
5 ^nc
ICS843SDN
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™ 3.3V LVPECL CLOCK GENERATOR
1
ICS843SDNAG REV. A FEBRUARY 19, 2009