PRELIMINARY

FEMTOCLOCKS™ CRYSTAL-TO-

LVHSTL FREQUENCY SYNTHESIZER

ICS8422002I-01

IDT™ / ICS™ LVHSTL FREQUENCY SYNTHESIZER

1

ICS8422002AGI-01 REV. C NOVEMBER 1, 2007

General Description

The ICS8422002I-01 is a 2 output LVHSTL

Synthesizer optimized to generate Ethernet

reference clock frequencies and is a member of the

solutions from IDT. Using a 25MHz 18pF parallel

resonant crystal, the following frequencies can be generated

based on the 2 frequency select pins (F_SEL[1:0]): 156.25MHz,

generation low phase noise VCO technology and can achieve 1ps

or lower typical rms phase jitter, easily meeting Ethernet jitter

requirements. The ICS8422002I-01 is packaged in a small 20-pin

TSSOP package.

Block Diagram

Features

LVCMOS/LVTTL single-ended input

125MHz, 62.5MHz

(1.875MHz - 20MHz): 0.44ps (typical)

Core/Output

3.3V/1.8V

2.5V/1.8V

packages

Pin Assignment

ICS422002I-01

20-Lead TSSOP

6.5mm x 4.4mm x 0.925mm package body

G Package

Top View

HiPerClockS™

ICS

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

F_SEL0

nc

nPLL_SEL

MR

nQ0

Q0

nc

Q1

nQ1

GND

nXTAL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

F_SEL1

1

1

0

1

0

Phase

Detector

VCO

M = 25 (fixed)

F_SEL[1:0]

0 0

÷4

0 1

÷5

1 0

÷10

1 1

Not Used

2

OSC

Q0

nQ0

Q1

nQ1

F_SEL[1:0]

nPLL_SEL

REF_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Pulldown

Pulldown

Pulldown

Pulldown

Pulldown

25MHz

The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization and/or qualification.

Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.