DATA SHEET

ICS843442AGI REVISION A JUNE 24, 2009

1

©2009 Integrated Device Technology, Inc.

FemtoClock™ SAS/SATA Clock Generator

ICS843442I

General Description

The ICS843442I is a low jitter, high performance clock

generator and a member of the FemtoClock™family of

silicon timing products. The ICS843442I is designed

for use in applications using the SAS and SATA

interconnect. The ICS843442I uses an external,

25MHz, parallel resonant crystal to generate two selectable output

frequencies: 75MHz and 150MHz. This silicon based approach

provides excellent frequency stability and reliability. The ICS843442I

features down and center spread spectrum (SSC) clocking

techniques.

Applications

Features

frequency

and low aging

1.07ps (typical)

HiPerClockS™

ICS

Block Diagram

Pin Assignment

ICS843442I

16-Lead TSSOP

4.4mm x 5.0mm x 0.925mm package body

G Package

Top View

OSC

Q0

nQ0

XTAL_IN

XTAL_OUT

25MHz

SSC_SEL[1:0]

nPLL_SEL

Q1

nQ1

FemtoClock™

PLL

Clock Output

Control Logic

0

1

Pulldown

Pulldown

0 =

75MHz

1 = 150MHz

(default)

2

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

SSC_SEL1

nc

nc

nc

SSC_SEL0

XTAL_IN

XTAL_OUT

F_SEL

nPLL_SEL

nQ0

Q0

nQ1

Q1