843021AGI-01

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 30, 2004

1

Integrated

Circuit

Systems, Inc.

ICS843021I-01

PRELIMINARY

The ICS843021I-01 is a Gigabit Ethernet Clock

family of high performance devices from ICS. The

ICS843021I-01 uses a 25MHz crystal to

synthesize 125MHz. The ICS843021I-01 has

excellent phase jitter performance, over the 1.875MHz – 20MHz

integration range. The ICS843021I-01 is packaged in a small

8-pin TSSOP, making it ideal for use in systems with limited

board space.

• 1 differential 3.3V LVPECL output

• Crystal oscillator interface designed for 25MHz,

18pF parallel resonant crystal

• Output frequency: 125MHz, using a 25MHz crystal

• VCO range: 490MHz - 640MHz

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.41ps (typical) (for 3.3V)

• Full 3.3V or 2.5V operating supply

• -40°C to 85°C ambient operating temperature

HiPerClockS™

ICS

ICS843021I-01

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm package body

G Package

Top View

XTAL_OUT

XTAL_IN

1

2

3

4

Q0

nQ0

OE

8

7

6

5

OSC

Phase

Detector

VCO

÷4

(fixed)

÷20

(fixed)

XTAL_IN

XTAL_OUT

Q0

nQ0

25MHz

OE

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.