MK1493-01

MK1493-01 PCI Clock Generator Description The MK1493-01 is a general purpose clock generator part that provides an integrated clocking solution for PCI /networking applications. It provides 8 individually programmable PCI clocks, 2 CPU clocks, additional fixed PCI clocks and a 25 MHz reference clock for LAN support. This part incorporates ICS’s newest clock technology, offering more robust features and functionality. Using a serially programmable SMBus interface, the MK1493-01 can select the output clock frequency, and enabling/disabling each individual output clock. Features 8 PCI clocks at 25, 33, 50, 66.66 MHz individually pin selectableand serioal port slectable 2 CPU clocks at 100 MHz 2 PCI clocks at 66.66 MHz 1 PCI clock @ 50 MHz 25 MHz reference clock SMBus Programming Power-up default frequency can be selected through FS inputs 25 MHz crystal or clock input required PCICLK cycle to cycle jitter <250ps CPUCLK cycle to cycle jitter <100ps Packaged in 48-pin (240mil) TSSOP Package Operating Voltage 3.3V + - 5% Block Diagram VDD 7 8 SCLK SDATA FS(0:7)_A FS(0:7)_B 8 8 PLL Divider Buffer Circuits SMBus Programmable 2 PCICLK(0:7) Each PCI Output Clock Individually Programmable CPUCLK(100MHz) 2 66M CLK 50M CLK X1/CLK 25 MHz X2 7 GND Clock Buffer/ Crystal Ocsillator REFCLK MDS 1493-01 B 1 Revision 021204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com MK1493-01 PCI Clock Generator P...