843004AG

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 18, 2004

1

Integrated

Circuit

Systems, Inc.

ICS843004

The ICS843004 is a 4 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, 156.25, 106.25MHz, and

noise VCO technology and can achieve 1ps or lower typical

rms phase jitter, easily meeting Fibre Channel jitter requirements.

The ICS843004 is packaged in a small 24-pin TSSOP package.

• Four 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, 156.25, 106.25MHz, 53.125MHz

• VCO range: 560MHz - 680MHz

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

(637KHz - 10MHz): 0.72ps (typical)

• RMS phase noise at 212.5MHz (typical)

Phase noise:

Offset

Noise Power

100Hz ............... -95.0 dBc/Hz

1KHz .............. -114.3 dBc/Hz

10KHz .............. -123.8 dBc/Hz

100KHz .............. -124.6 dBc/Hz

• Full 3.3V supply mode

• -30°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

ICS843004

24-Lead TSSOP

4.40mm x 7.8mm x 0.92mm

package body

G Package

Top View

nQ1

Q1

Q0

nQ0

MR

nPLL_SEL

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F_SEL0

F_SEL1

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nQ2

Q2

Q3

nQ3

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nXTAL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

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TEST_CLK

XTAL_IN

XTAL_OUT

nXTAL_SEL

MR

Q0

nQO

Q1

nQ1

Q2

nQ2

Q3

nQ3

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Pulldown

26.5625MHz

Pulldown

Pulldown

Pulldown