8442AYI

www.icst.com/products/hiperclocks.html

REV. C MAY 10, 2005

1

Integrated

Circuit

Systems, Inc.

ICS8442I

The ICS8442I is a general purpose, dual output

Crystal-to-Differential LVDS High Frequency

Synthesizer and a member of the HiPerClockS™

family of High Performance Clock Solutions from

ICS. The ICS8442I has a selectable TEST_CLK

or crystal input. The TEST_CLK input accepts LVCMOS or

LVTTL input levels and translates them to LVDS levels. The

VCO operates at a frequency range of 250MHz to 700MHz.

The VCO frequency is programmed in steps equal to the value

of the input reference or crystal frequency. The VCO and output

frequency can be programmed using the serial or parallel

interface to the configuration logic. The low phase noise

characteristics of the ICS8442I makes it an ideal clock source

for Gigabit Ethernet and Sonet applications.

• Dual differential LVDS outputs

• Selectable crystal oscillator interface or

LVCMOS/LVTTL TEST_CLK

• Output frequency range: 31.25MHz to 700MHz

• Crystal input frequency range: 10MHz to 25MHz

• VCO range: 250MHz to 700MHz

• Parallel or serial interface for programming counter

and output dividers

• RMS period jitter: 3.5ps (typical)

• Cycle-to-cycle jitter: 18ps (typical)

• 3.3V supply voltage

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

HiPerClockS™

ICS

32 31 30 29 28 27 26 25

9

10 11 12 13 14 15 16

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

XTAL_OUT

TEST_CLK

XTAL_SEL

S_LOAD

S_DATA

S_CLOCK

MR

M5

M6

M7

M8

N0

N1

nc

GND

32-Lead LQFP

7mm x 7mm x 1.4mm package body

Y Package

Top View

ICS8442I

OSC

VCO_SEL

XTAL_SEL

TEST_CLK

XTAL_IN

XTAL_OUT

S_LOAD

S_DATA

S_CLOCK

nP_LOAD

M0:M8

N0:N1

VCO

PLL

FOUT0

nFOUT0

FOUT1

nFOUT1

TEST

CONFIGURATION

INTERFACE

LOGIC

÷ M

0

1

0

1

PHASE DETECTOR

÷ 1

÷ 2

÷ 4

÷ 8

MR