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Integrated Circuit Systems, Inc.
ICS9248-77
Frequency Timing Generator for PENTIUM II Systems
General Description
The ICS9248-77 is a main clock synthesizer chip for Pentium II based systems using Rambus Interface DRAMs. This chip provides all the clocks required for such a system when used with a Direct Rambus Clock Generator(DRCG) chip such as the ICS9212-01. Spread Spectrum may be enabled by driving the SPREAD# pin active. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS924877 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. The CPU/2 clocks are inputs to the DRCG.
ICS9248-77 Datasheet
