Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9219

0931B—10/25/04

Block Diagram

Direct Rambus™ Clock Generator Lite

ICS9219 is a High-speed clock generator providing 400 or

533 MHz differential clock source for direct Rambus



memory system. ICS9219 takes a crystal as an input

reference source, and produces the differential output

clock required for the Rambus channel. ICS9219 provides

a solution for a broad range of Direct Rambus memory

applications. ICS9219 can be used in single or dual

Rambus channels. An additional LVCMOS output, which

provides a reference clock at the crystal frequency for the

other system blocks is also included.

•

•

Provides differential clock source for direct

Rambus memory system with 1GHz data transfer

rate capability

•

Cycle to Cycle jitter is less than 100ps

•

3.3V + 4% supply

•

LVCMOS REF clock @ crystal frequency

•

Output edge rate control to minimize EMI

PLL

Control

Logic

Xtal

OSC

FS0

X1

X2

FS1

VDDT

FS2

BUSCLKT

BUSCLKC

REF

VDDT 1

16 FS0*

GND 2

15 VDD

X2 3

14 GND

X1 4

13 BUSCLKT

VDD 5

12 BUSCLKC

REF 6

11 GND

GND 7

10 VDD

FS1* 8

9 FS2*

Pin Configuration

16-Pin 173 mil TSSOP

* Pins have 60K internal pull-up to VDD

Table 1. PLL Multiplier Selection and Output Frequency

FS0

Mult

BUSCLK

1

0

16

400.00

1

21.33

2

533.30

Notes:

1Output frequencies are based on 25MHz XTAL Input

multipliers are also applicable to spread spectrum modulated input clocks.

2 Default muliplier value at power up.