ICS9148-46 - Pentium/Pro™ System Clock Chip - ICST 数据手册 ( 数据表 )

General Description
The ICS9148-46 is part of a reduced pin count two-chip clock solution for designs using an Intel BX style chipset. Companion SDRAM buffers are ICS9179-03, and -12.
There are two PLLs, with the first PLL capable of spread spectrum operation. Spread spectrum typically reduces system EMI by 8-10dB. The second PLL provides support for USB (48MHz) and 24MHz requirements. CPU frequencies up to 100MHz are supported.

FEATUREs
• Generates system clocks for CPU, PCI, 14.314 MHz, 48 and 24MHz.
• Supports single or dual processor systems
• Skew from CPU (earlier) to PCI clock 1 to 4ns
• Separate 2.5V and 3.3V supply pins
• 2.5V outputs: CPU
• 3.3V outputs: PCI, REF
• No power supply sequence requirements
• 28 pin SSOP
• Spread Sectrum operation optional for PLL1
• CPU frequencies to 100MHz are supported.