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Integrated Circuit Systems, Inc.
ICS9250-12
Frequency Timing Generator for PENTIUM II/III Systems
General Description
The ICS9250-12 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, 02, 03 and a PCI buffer 9112-17. 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 ICS9250-12 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.
ICS9250-12 Datasheet
