Click to expand full text
Integrated Circuit Systems, Inc.
ICS9147-22
Pentium/ProTM System and Cyrix Clock Chip
General Description
The ICS9147-22 is a Clock Synthesizer chip for Pentium and PentiumPro plus Cyrix CPU based Desktop/Notebook systems that will provide all necessary clock timing. Features include four CPU, seven PCI and eight SDRAM clocks. Two reference outputs are available equal to the crystal frequency, plus the IOAPIC output powered by VDDL. Additionally, the device meets the Pentium powerup stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up. High drive PCICLK and SDRAM outputs typically provide greater than 1 V/ns slew rate into 30 pF loads. CPUCLK outputs typically provide better than 1V/ns slew rate into 20 pF loads while maintaining 50 ± 5% duty cycle.
ICS9147-22 Datasheet
