848004AGI

www.icst.com/products/hiperclocks.html

REV. A AUGUST 18, 2005

1

Integrated

Circuit

Systems, Inc.

ICS848004I

PRELIMINARY

The ICS848004I is a 4 output SSTL_2

Synthesizer optimized to generate Fibre

Channel reference clock frequencies and is

performance 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_SEL[1:0]): 212.5MHz, 187.5MHz,

159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz.

noise VCO technology and can achieve 1ps or lower

typical rms phase jitter, easily meeting Fibre Channel

jitter requirements. The ICS848004I is packaged in a

small 24-pin TSSOP package.

• Four SSTL_2 differential clock output pairs

• 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): 0.80ps (typical)

• SSTL operating voltage supply ranges:

V

V

V

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

HiPerClockS™

ICS

1

1

0

1

0

Phase

Detector

VCO

637.5MHz

(w/26.5625MHz

Reference)

M = 24 (fixed)

F_SEL[1:0]

0 0

÷3

0 1

÷4

1 0

÷6

1 1

÷12

2

OSC

ICS848004I

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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6

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6

20

0

4

23

8

5

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2

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2

5

2

6

5

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6

20

1

4

24

6

5

7

3

.

9

5

1

5

2

6

5

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6

21

0

4

26

4

5

2

.

6

0

1

5

2

6

5

.

6

21

1

4

22

12

5

2

1

.

3

5

6

6

1

4

0

.

6

20

1

4

24

6

5

2

.

6

5

1

5

7

3

4

.

3

20

0

4

23

8

5

.

7

8

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.