ICS844051I Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844051I is a Gigabit Ethernet Clock
ICS
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from ICS.}
The ICS844051I can synthesize 10 Gigabit
Ethernet, SONET, or Serial ATA reference clock
frequencies with the appropriate choice of crystal and output
divider. The ICS844051I has excellent phase jitter perfor-
mance 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 parallel resonant crystals (18.125MHz - 23.4375MHz)
• Output frequency range: 145MHz - 187.5MHz and
72.5MHz - 93.75MHz
• VCO range: 580MHz - 750MHz
• RMS phase jitter @156.25MHz (1.875MHz - 20MHz):
0.45ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
BLOCK DIAGRAM
PIN ASSIGNMENT
FREQ_SEL ^Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
÷32
(fixed)
0 ÷4 (default)
1 ÷8
VDDA 1
GND 2
Q _{XTAL_OUT 3}
nQ
XTAL_IN 4
8 VDD
7Q
6 nQ
5 FREQ_SEL
ICS844051I
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.
844051CGI
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 23, 2005
1