General Description

The ICS9147-16 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro. Two different reference frequency multiplying factors are externally selectable with smooth frequency transitions. Glitch-free Stop clock control is provided for CPU and BUS clocks. Complete chip low current mode is achieved with the Power Down# pin.

Features

• Generates four processor, eight bus, four 14.31818 MHz, two 48 MHz clocks for USB support.

• CPU to BUS clock skew 1 to 4ns (CPU early)

• Synchronous clocks skew matched to 250ps window on CPU and 500ps window on BUS.

• Selectable multiplying ratios

• Glitch free stop clock controls CPUEN and BUSEN

• 3.0V - – 3.7V supply range, 2.5V to VDD supply range for CPU (1:4) clocks and IOAPIC clock.

• 48-pin SSOP package