ICS9219 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – Direct Rambus Clock Generator Lite

Integrated
Circuit
Systems, Inc.
ICS9219
Direct Rambus™ Clock Generator Lite
General Description
Features
ICS9219 is a High-speed clock generator providing 400 or ^{• Compatible with all Direct RambusTM based ICs}
533 MHz differential clock source for direct Rambus _{• Provides differential clock source for direct}
memory system. ICS9219 takes a crystal as an input
Rambus memory system with 1GHz data transfer
reference source, and produces the differential output
rate capability
clock required for the Rambus channel. ICS9219 provides
a solution for a broad range of Direct Rambus memory
•
Cycle to Cycle jitter is less than 100ps
applications. ICS9219 can be used in single or dual • 3.3V + 4% supply
Rambus channels. An additional LVCMOS output, which
provides a reference clock at the crystal frequency for the
•
LVCMOS REF clock @ crystal frequency
other system blocks is also included.
• Output edge rate control to minimize EMI
Block Diagram
FS0
X1
Xtal
X2
OSC
PLL
VDDT
FS1
FS2
Control
Logic
BUSCLKT
BUSCLKC
REF
Pin Configuration
VDDT 1
GND 2
X2 3
X1 4
VDD 5
REF 6
GND 7
FS1* 8
16 FS0*
15 VDD
14 GND
13 BUSCLKT
12 BUSCLKC
11 GND
10 VDD
9 FS2*
16-Pin 173 mil TSSOP
* Pins have 60K internal pull-up to VDD
Table 1. PLL Multiplier Selection and Output Frequency
FS0
Mult
BUSCLK¹
0
16
400.00
1
21.33²
533.30
Notes:
1 Output frequencies are based on 25MHz XTAL Input
multipliers are also applicable to spread spectrum modulated input clocks.
2 Default muliplier value at power up.
0931B—10/25/04