ICS9219

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 ICS9219 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....