844001AGI

www.icst.com/products/hiperclocks.html

REV. A JUNE 16, 2005

1

Integrated

Circuit

Systems, Inc.

ICS844001I

PRELIMINARY

The ICS844001I is a Fibre Channel Clock

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

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.

• (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

HiPerClockS™

ICS

ICS844001I

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm

package body

G Package

Top View

GND

XTAL_OUT

XTAL_IN

1

2

3

4

Q

nQ

FREQ_SEL

8

7

6

5

OSC

Phase

Detector

VCO

490MHz - 680MHz

÷3

÷6

1

0

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XTAL_OUT

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Pullup

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.