ICS842S104 datasheet(1/21 Pages) IDT

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DATA SHEET

ICS842S104CG REVISION A MARCH 17, 2010

1

Crystal-to-HSTL 100MHz / 200MHz

PCI Express™ Clock Synthesizer

ICS842S104

General Description

The ICS842S104 is a PLL-based clock generator specifically

designed for PCI Express™ Clock Generation 2 applications. This

device generates either a 200MHz or 100MHz differential HSTL

clock from an input reference of 25MHz. The input reference may be

derived from an external source or by the addition of a 25MHz

crystal to the on-chip crystal oscillator. An external reference is

applied to the XTAL_IN pin with the XTAL_OUT pin left floating.The

device offers spread spectrum clock output for reduced EMI

applications. An I2C bus interface is used to enable or disable spread

spectrum operation as well as select either a down spread value of

-0.35% or -0.5%.The ICS842S104 is available in a lead-free 24-Lead

package.

Features

• Four differential HSTL output pairs

• Crystal oscillator interface: 25MHz

• Output frequency: 100MHz or 200MHz

• RMS phase jitter @ 200MHz (12kHz – 20MHz): 1.27ps (typical)

• Cycle-to-cycle jitter: 25ps (maximum)

• I2C support with readback capabilities up to 400kHz

• Spread Spectrum for electromagnetic interference (EMI) reduction

• 3.3V core/1.5V to 2.0V output operating supply

• 0°C to 70°C ambient operating temperature

• Available lead-free (RoHS 6) package

• PCI Express Gen2 Jitter Compliant

HiPerClockS™

OSC

PLL

Divider

Network

I2C

Logic

SDATA

SCLK

Pullup

SRCT[1:4]

SRCC[1:4]

25MHz

XTAL_IN

XTAL_OUT

4

ICS842S104

24-Lead TSSOP

4.4mm x 7.8mm x 0.925mm package body

G Package

Top View

VSS

VDD

VDDO

VSS

SRCC1

SRCT1

SRCC2

SRCT2

VSS

SRCC3

SRCT3

nc

SRCC4

SRCT4

SDATA

SCLK

nc

XTAL_OUT

XTAL_IN

VDDO

VDD

VDDA

VSS

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

Pin Assignment

Block Diagram

Số phần tương tự - ICS842S104

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	ICS842031AGI-01T	152Kb / 9P	FEMTOCLOCKS??CRYSTAL-TO- HSTL CLOCK GENERATOR REV. A JUNE 21, 2005

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