ICS8442 datasheet(1/15 Pages) ICST

Il numero della parte	ICS8442

Spiegazioni elettronici	700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

PDF	15 Pages

Scroll/Zoom	100%

Produttore elettronici	ICST [Integrated Circuit Systems]

Homepage	http://www.icst.com

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1 / 15 page

8442AY

www.icst.com/products/hiperclocks.html

REV. C JULY 8, 2004

1

Integrated

Circuit

Systems, Inc.

ICS8442

700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL

LVDS FREQUENCY SYNTHESIZER

GENERAL DESCRIPTION

The ICS8442 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 ICS8442 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 inter-

face to the configuration logic.The low phase noise characteris-

tics of the ICS8442 makes it an ideal clock source for Gigabit

Ethernet and Sonet applications.

BLOCK DIAGRAM

PIN ASSIGNMENT

FEATURES

• 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: 2.7ps (typical)

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

• 3.3V supply voltage

• 0°C to 85°C ambient operating temperature

• “Lead-Free” package available

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

XTAL1

TEST_CLK

XTAL_SEL

VDDA

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

ICS8442

HiPerClockS™

ICS

OSC

VCO_SEL

XTAL_SEL

TEST_CLK

XTAL1

XTAL2

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

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