840AG-77

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 7, 2005

1

Integrated

Circuit

Systems, Inc.

ICS840-77

PRELIMINARY

The ICS840-77 is a SONET Oscillator Replace-

family of high performance devices from ICS.

The ICS840-77 uses a 19.44MHz crystal to

synthesize 77.76MHz. The ICS840-77 has

excellent jitter performance. The ICS840-77 is packaged in

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

limited board space.

• One LVCMOS/LVTTL output, 15Ω output impedence

• Crystal oscillator interface designed for 19.44MHz,

18pF parallel resonant crystal

• Output frequency: 77.76MHz

• Random jitter: 2.82ps (typical)

• Deterministic jitter: 0.205ps (typical)

• 3.3V operating supply

• 0°C to 70°C ambient operating temperature

• Available in both standard and lead-free RoHS-compliant

packages

HiPerClockS™

ICS

ICS840-77

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm package body

G Package

Top View

ICS840-77

8-Lead SOIC

3.90mm x 4.92mm x 1.37mm body package

M Package

Top View

1

2

3

4

8

7

6

5

Clock

Synthesizer

XTAL_IN

XTAL_OUT

OE

Q0

Pullup

19.44MHz

77.76MHz

Q1

XTAL_OUT

XTAL_IN

OE

Q1

Q0

GND

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.