ICS9148-53

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . GND -0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature . . . . . . . . . . . . . . . . . . . .   -65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.

The ICS9148-53 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro, AMD or Cyrix. Sixteen different reference frequency multiplying factors are externally selectable with smooth frequency transitions.

Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9148-53 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

Serial programming I2C interface of the ICS9148-53 allows changing functions, stop clock programming and frequency selection. The SDRAM12 output may be used as a feed back into an off chip PLL.