PRELIMINARY
ICS844011I
Integrated
Circuit
Systems, Inc.
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
FEATURES
• One differential LVDS output
The ICS844011I is a Fibre Channel Clock
ICS
HiPerClockS™
Generator and a member of the HiPerClocksTM
family of high performance devices from ICS.
The ICS844011I uses an 18pF parallel resonant
crystal over the range of 20.4MHz - 28.3MHz. For
• Crystal oscillator interface, 18pF parallel resonant crystal
(20.4MHz - 28.3MHz)
• Output frequency range: 81.66MHz - 113.33MHz
• VCO range: 490MHz - 680MHz
Fibre Channel applications, a 26.5625MHz crystal is used.
The ICS844011I has excellent <1ps phase jitter per-
formance, over the 637kHz - 10MHz integration range. The
ICS844011I is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
• RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.75ps (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
COMMON CONFIGURATION TABLE - FIBRE CHANNEL
Inputs
Output Frequency
(MHz)
Multiplication
Value M/N
Crystal Frequency (MHz)
M
N
26.5625
25
24
24
6
6
4
4
106.25
100
BLOCK DIAGRAM
PIN ASSIGNMENT
Pullup
OE
VDDA
GND
VDD
Q
1
2
3
4
8
7
6
5
XTAL_OUT
XTAL_IN
nQ
OE
XTAL_IN
OSC
XTAL_OUT
Q
VCO
Phase
Detector
N = ÷6 (fixed)
490MHz - 680MHz
nQ
ICS844011I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
M = ÷24 (fixed)
G Package
TopView
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.
844011AGI
www.icst.com/products/hiperclocks.html
REV.A APRIL 18, 2006
1