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ICS844001AGI

Description
FEMTOCLOCKS⑩ CRYSTAL-TO- LVDS CLOCK GENERATOR
File Size153KB,10 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS844001AGI Overview

FEMTOCLOCKS⑩ CRYSTAL-TO- LVDS CLOCK GENERATOR

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS844001I
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
- LVDS
C
LOCK
G
ENERATOR
F
EATURES
(1) Differential LVDS output
Crystal oscillator interface, 18pF parallel resonant crystal
(20.4MHz - 28.3MHz)
Output frequency range: 81.66MHz - 226.66MHz
VCO range: 490MHz - 680MHz
RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.74ps (typical)
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
G
ENERAL
D
ESCRIPTION
The ICS844001I is a Fibre Channel Clock
Generator and a member of the HiPerClocks
TM
HiPerClockS™
family of high performance devices from ICS.
The ICS844001I uses an 18pF parallel resonant
crystal over the range of 20.4MHz - 28.3MHz.
For Fibre Channel applications, a 26.5625MHz crystal is used.
The frequency select pin allows the device to generate
either 106.25MHz or 212.5MHz from a 26.5625MHz
cr ystal. To generate 187.5MHz for 12Gb Ethernet, a
23.4375MHz crystal is used. The ICS844001I uses ICS’ 3
rd
generation low phase noise VCO technology and can
achieve <1ps typical rms phase jitter, easily meeting Fibre
Channel and Ethernet jitter requirements. The ICS844001I is
packaged in a small 8-pin TSSOP, making it ideal for use in
systems with limited board space.
ICS
C
OMMON
C
ONFIGURATION
T
ABLE
- F
IBRE
C
HANNEL
, 12Gb E
THERNET
Inputs
Crystal Frequency (MHz)
26.5625
26.5625
23.4375
FREQ_SEL
0
1
1
M
24
24
24
N
6
3
3
Multiplication
Value M/N
4
8
8
Output Frequency
(MHz)
106.25
212.5
187.5
B
LOCK
D
IAGRAM
FREQ_SEL
Pullup
P
IN
A
SSIGNMENT
÷3
1
Q
nQ
V
DDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
DD
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
490MHz - 680MHz
÷6
M = ÷24
(fixed)
0
ICS844001I
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.
844001AGI
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
1

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