843002AG

www.icst.com/products/hiperclocks.html

REV. B MAY 6, 2005

1

Integrated

Circuit

Systems, Inc.

ICS843002

The ICS843002 is a 2 output LVPECL 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 2 frequency select pins (F_SEL[1:0]):

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

phase noise VCO technology and can achieve 1ps or lower

typical rms phase jitter, easily meeting Fibre Channel jitter

requirements. The ICS843002 is packaged in a small 20-pin

TSSOP package.

• Two 3.3V LVPECL outputs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 212.5MHz,

187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter (637kHz - 10MHz): 0.72ps (typical)

• Typical phase noise at 212.5MHz

Phase noise:

Offset

Noise Power

100Hz ............... -87.7 dBc/Hz

1KHz .............. -111.6 dBc/Hz

10KHz .............. -124.3 dBc/Hz

100KHz .............. -124.3 dBc/Hz

• Full 3.3V supply mode

• Lead-Free package RoHS compliant

• -30°C to 85°C ambient operating temperature

HiPerClockS™

ICS

1

1

0

1

0

Phase

Detector

VCO

637.5MHz

(w/26.5625MHz

Reference)

OSC

M = 24 (fixed)

F_SEL[1:0]

0 0

÷3

0 1

÷4

1 0

÷6

1 1

÷12

2

ICS843002

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm

package body

G Package

Top View

F_SEL[1:0]

nPLL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Q0

nQ0

Q1

nQ1

Pulldown

Pulldown

26.5625MHz

nc

Q0

nQ0

MR

nPLL_SEL

nc

F_SEL0

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

Q1

nQ1

nXTAL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

F_SEL1

Pulldown

Pulldown

Pulldown

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