PCI EXPRESS™ CLOCK GENERATOR

ICS841S02I

1

ICS841S02BGI REV. C NOVEMBER 1, 2007

PRELIMINARY

The ICS841S02I is a PLL-based clock generator

specifically designed for PCI_Express™Clock

Generation applications. This device generates a

100MHz HCSL clock. The device offers a HCSL

(Host Clock Signal Level) clock output from a clock

input reference of 25MHz. The input reference may be derived

from an external source or by the addition of a 25MHz crystal to

the on-chip crystal oscillator. An external reference may be applied

to the XTAL_IN pin with the XTAL_OUT pin left floating.

The device offers spread spectrum clock output for reduced EMI

spread spectrum operation as well as select either a down spread

value of -0.35% or -0.5%.

The ICS841S02I is available in both standard and lead-free

20-Lead TSSOP packages.

• Two 0.7V current mode differential HCSL output pairs

• Crystal oscillator interface, 25MHz

• Output frequency: 100MHz

• RMS period jitter: 3ps (maximum)

• Output skew: 35ps (maximum)

• Cycle-to-cyle jitter: 35ps (maximum)

• Spread Spectrum for electromagnetic interference (EMI)

reduction

• 3.3V operating supply mode

• -40°C to 85°C ambient operating temperature

• Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages

HiPerClockS™

ICS

Divider

Network

PLL

OSC

Logic

SRCT[1:2]

SRCC[1:2]

Pullup

Pullup

XTAL_IN

XTAL_OUT

SDATA

SCLK

IREF

25MHz

ICS841S02I

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

SRCT2

SRCC2

SRCT1

SRCC1

IREF

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

SDATA

SCLK

nc

XTAL_OUT

XTAL_IN

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.