ICS9147-03

Features:

• Total of 15 CPU speed clocks:
- Two copies of CPU clock with VDDL (2.5 to 3.3V)
- Twelve (12) SDRAM (3.3v) plus one CPUH/AGP (3.3V) clocks
• Six copies of BUS clocks (synchronous with CPU clock/2 or asynchronous 32 MHz)
• 250ps output skew window for CPU andSDRAM clocks and 500ps window BUS clocks. CPU clocks to BUS clocks skew 1-4ns (CPU early)
• Two copies of Ref. clock @14.31818 MHz (One driven by VDDL as IOAPIC)
• One 48 MHz (3.3 V TTL) for USB support and single 24MHz.
• Separate VDDL for CPUL (1:2) clock buffers and IOAPIC to allow 2.5V output (or Std. Vdd)
• 3.0V 3.7V supply range w/2.5V compatible outputs
• 48-pin SSOP package


Pinout




Specifications

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


Description

The ICS9147-03 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro, AMD or Cyrix processors. Four bidirectional I/O pins (FS0, FS1, FS2, BSEL) are latched at power-on to the functionality table. The Six BUS clocks can be selected as either synchronous at 1/2 CPU speed or asynchronous at 32MHz selected by BSEL latched input.The inputs of the ICS9147-03 provide for tristate and test mode conditions to aid in system level testing.These multiplying factors can be customized for specific applications. Glitch-free stop clock controls provided for SDRAM(5:8) and SDRAM (9:12) banks (STP2#, STP3#).

High drive BUS and SDRAM of the ICS9147-03 outputs typically provide greater than 1 V/ns slew rate into 30 pF loads. CPU outputs typically provide better than 1V/ns slew rate into 20pF loads while maintaining 50±5% duty cycle. The REF clock outputs typically provide better than 0.5V/ns slew rates. Seperate buffer supply pin VDDL allows for nominal 3.3V voltage or reduced voltage swing (from 2.9 to 2.5V) for CPUL (1:2) and IOAPIC outputs.