Integrated

Circuit

Systems, Inc.

840004AGI

www.icst.com/products/hiperclocks.html

REV. A JUNE 28, 2005

1

ICS840004I

PRELIMINARY

The ICS840004I is a 4 output LVCMOS/LVTTL

Synthesizer optimized to generate Fibre Channel

reference clock frequencies and is a member of

clock solutions from ICS. Using a 26.5625MHz,

18pF parallel resonant crystal, the following frequencies can be

generated based on the 2 frequency select pins (F_SEL1:0):

212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and

noise VCO technology and can achieve 1ps or lower typical

random rms phase jitter, easily meeting Fibre Channel jitter

requirements. The ICS840004I is packaged in a small 20-pin

TSSOP package.

HiPerClockS™

ICS

• Four LVCMOS/LVTTL outputs, 15

Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Supports the following input frequencies: 212.5MHz,

159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz

• RMS phase jitter @ 212.5MHz(2.55MHz - 20MHz):

0.49ps (typical)

• Output supply modes:

Core/Output

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

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

Q0

Q1

Q2

Q3

OE

F_SEL1:0

nPLL_SEL

nXTAL_SEL

XTAL_IN

XTAL_OUT

TEST_CLK

MR

OSC

Phase

Detector

VCO

M = ÷24 (fixed)

F_SEL1:0

0 0 ÷3

0 1 ÷4

1 0 ÷6

0

1

1

0

2

N

26.5625MHz

Pullup

Pulldown

Pulldown

Pulldown

Pullup:Pullup

Pulldown

ICS840004I

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

F_SEL0

nc

nXTAL_SEL

TEST_CLK

OE

MR

nPLL_SEL

nc

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

F_SEL1

GND

Q0

Q1

Q2

Q3

GND

XTAL_IN

XTAL_OUT

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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.