844008AY-16

www.icst.com/products/hiperclocks.html

REV. A FEBRUARY 1, 2006

1

Integrated

Circuit

Systems, Inc.

ICS844008-16

PRELIMINARY

The ICS844008-16 is an 8 output LVDS

Synthesizer optimized to generate PCI Express

reference clock frequencies and is a member

clock solutions from ICS. Using a 25MHz

parallel resonant crystal, the following frequencies can be

generated based on F_SEL pin: 100MHz or 125MHz. The

VCO technology and can achieve <1ps typical rms phase

jitter, easily meeting PCI Express jitter requirements. The

ICS844008-16 is packaged in a 32-pin LQFP package.

• Eight LVDS outputs

• Crystal oscillator interface

• Supports the following output frequencies:

100MHz or 125MHz

• VCO: 500MHz

• RMS phase jitter @ 125MHz, using a 25MHz crystal

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

• Full 3.3V supply modes

• 0°C to 70°C ambient operating temperature

• Available in both standard and lead-free RoHS compliant

packages

HiPerClockS™

ICS

32 31 30 29 28 27 26 25

9

10 11 12 13 14 15 16

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

Q0

nQ0

Q1

nQ1

GND

Q2

nQ2

ICS844008-16

32-Lead LQFP

7mm x 7mm x 1.4mm

package body

Y Package

Top View

Q7

nQ7

Q6

nQ6

GND

Q5

nQ5

1

0

Phase

Detector

VCO

500MHz

(w/25MHz

Reference)

÷4

÷5

OSC

nPLL_SEL

XTAL_IN

XTAL_OUT

OE1

MR

F_SEL

OE2

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Q4

nQ4

Q5

nQ5

Q6

nQ6

Q7

nQ7

Pullup

Pullup

25MHz

Pulldown

Pullup

Pulldown

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1

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.