8430252CG-45

www.icst.com/products/hiperclocks.html

REV. B DECEMBER 9, 2005

1

Integrated

Circuit

Systems, Inc.

ICS8430252-45

PRELIMINARY

The ICS8430252-45 is a 2 output LVPECL and

LVCMOS/LVTTL Synthesizer optimized to gen-

erate Ethernet reference clock frequencies and

is a member of the HiPerClocks™ family of high

performance clock solutions from ICS. Using a

25MHz, 18pF parallel resonant crystal, the following fre-

quencies can be generated: 156.25MHz LVPECL output

and, 125MHz LVCMOS output. The 8430252-45 uses ICS’

3rd generation low phase noise VCO technology and can

achieve 1ps or lower typical rms phase jitter, easily meet-

ing Ethernet jitter requirements. The ICS8430252-45 is

packaged in a small 16-pin TSSOP package.

• One differential 3.3V LVPECL output and

One LVCMOS/LVTTL output

• Crystal oscillator interface designed for a 25MHz,

18pF parallel resonant crystal

• A 25MHz crystal generates both an output frequency of

156.25MHz (LVPECL) and 125MHz (LVCMOS)

• VCO frequency: 625MHz

• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz) using

a 25MHz crystal: 0.39ps (typical)

• Full 3.3V supply mode

• 0°C to 70°C ambient operating temperature

• Industrial temperature available upon request

• Available in both standard and lead-free RoHS compliant

packages

HiPerClockS™

ICS

XTAL_IN

XTAL_OUT

QA

QB

nQB

OE

QA

nc

nc

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CLK_EN

QB

nQB

XTAL_IN

XTAL_OUT

ICS8430252-45

16-Lead TSSOP

4.4mm x 5.0mm x 0.92mm

package body

G Package

Top View

OSC

Phase

Detector

VCO

625MHz

Feedback Divider

÷25

÷4

÷5

25MHz

CLK_EN

OE

Pullup

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.