ICS843001 datasheet(1/15 Pages) ICST

Part #	ICS843001

Description	FEMTO CLOCKS CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR

PDF	15 Pages

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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1 / 15 page

843001AG

www.icst.com/products/hiperclocks.html

REV. B OCTOBER 13, 2004

1

Integrated

Circuit

Systems, Inc.

ICS843001

FEMTOCLOCKS™CRYSTAL-TO-

3.3V LVPECL CLOCK GENERATOR

GENERAL DESCRIPTION

The ICS843001 is a Fibre Channel Clock Generator

and a member of the HiPerClocksTM family of high

performance devices from ICS. The ICS843001

uses either a 26.5625MHz or a 23.4375 crystal to

synthesize 106.25MHz, 187.5MHz or 212.5MHz,

using the FREQ_SEL pin. The ICS843001 has excellent <1ps

phase jitter performance, over the 637KHz – 10MHz integration

range. The ICS843001 is packaged in a small 8-pin TSSOP,

making it ideal for use in systems with limited board space.

FEATURES

• 1 differential 3.3V LVPECL output

• Crystal oscillator interface designed for 23.4375MHz or

26.5625MHz, 18pF parallel resonant crystal

• Selectable 106.25MHz, 187.5MHz or 212.5MHz

output frequency

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 106.255MHz, using a 26.5625MHz crystal

(637KHz - 10MHz): 0.74ps (typical)

• RMS phase noise at 106.25MHz

Phase noise:

Offset

Noise Power

100Hz ............... -95.2 dBc/Hz

1KHz .............. -118.7 dBc/Hz

10KHz .............. -129.1 dBc/Hz

100KHz .............. -129.6 dBc/Hz

• 3.3V operating supply

• -30°C to 85°C ambient operating temperature

HiPerClockS™

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FUNCTION TABLE

ICS843001

8-Lead TSSOP

4.40mm x 3.0mm x 0.925mm package body

G Package

Top View

VCCA

VEE

XTAL_OUT

XTAL_IN

1

2

3

4

VCC

Q0

nQ0

FREQ_SEL

8

7

6

5

OSC

Phase

Detector

VCO

637.5MHz w/

26.5625MHz Ref.

M = ÷24 (fixed)

1

0

÷6

÷3

BLOCK DIAGRAM

PIN ASSIGNMENT

XTAL_IN

XTAL_OUT

nQ0

Q0

FREQ_SEL

(Pulldown)

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