ICS9248-72

Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . 7.0 V
Logic Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . GND -0.5 V to VDD+0.5V
Ambient Operating Temperature. . . . . . . . . . .. . . . . .. . . . 0 to +70
Storage Temperature. . . . . . . . . . . . . . . . . . . .. . . .. . . . . -65  to+150

The ICS9248-72 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 ICS9211-01.

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 ICS9248-72 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

The CPU/2 clocks of the ICS9248-72 are inputs to the DRCG.