8421004AGI

www.icst.com/products/hiperclocks.html

REV. A MARCH 29, 2005

1

Integrated

Circuit

Systems, Inc.

ICS8421004I

PRELIMINARY

The ICS8421004I is a 4 output HSTL Synthesizer

optimized to generate Fibre Channel reference

clock frequencies and is a member of the

solutions from ICS. Using a 26.5625MHz 18pF

parallel resonant crystal, the following frequencies can be

generated based on the two frequency select pins (F_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 156.25, 106.25MHz and

phase noise VCO technology and can achieve 1ps or lower

typical rms phase jitter, easily meeting Fibre Channel jitter

requirements. The ICS8421004I is packaged in a small 24-pin

TSSOP package.

• Four HSTL outputs (VOHmax = 1.4)

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, 53.125MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal

(637kHz - 10MHz): 0.59ps (typical)

• Power supply modes:

Core/Output

3.3V/1.8V

2.5V/1.8V

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

HiPerClockS™

ICS

1

1

0

1

0

Phase

Detector

VCO

M = 24 (fixed)

F_SEL[1:0]

0 0

÷3

0 1

÷4

1 0

÷6

1 1

÷12

2

OSC

ICS8421004I

24-Lead TSSOP

4.40mm x 7.8mm x 0.92mm

package body

G Package

Top View

nQ1

Q1

Q0

nQ0

MR

nPLL_SEL

nc

F_SEL0

F_SEL1

1

2

3

4

5

6

7

8

9

10

11

12

nQ2

Q2

Q3

nQ3

GND

nc

nXTAL_SEL

TEST_CLK

GND

XTAL_IN

XTAL_OUT

24

23

22

21

20

19

18

17

16

15

14

13

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3

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1

F_SEL[1:0]

nPLL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Q0

nQ0

Q1

nQ1

Q2

nQ2

Q3

nQ3

Pulldown

Pulldown

26.5625MHz

Pulldown

Pulldown

Pulldown

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.