ICS9147-01 Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUMTM

Integrated
Circuit
Systems, Inc.
ICS9147- 01
Frequency Generator & Integrated Buffers for PENTIUM^TM
General Description
The ICS9147-01 generates all clocks required for high
speed RISC or CISC microprocessor systems such as Intel
PentiumPro. Two bidirectional I/O pins (FS1,FS2) are latched
at power-on to the functionality table, with FS0 selectable
in real-time to toggle between conditions. The inputs
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
clockcontrols are provided for CPU clocks and BUS clocks.
High drive BUS and SDRAM 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 20 pF
loads while maintaining 50 ±5% duty cycle. The REF clock
outputs typically provide better than 0.5V/ns slew rates.
Seperate buffers supply pins VDD2 allow for 3.3V or
reduced voltage swing (from 2.9 to 2.5V) for CPU (1:4) and
IOAPIC outputs.
Features
• Four copies of CPU clock
• Six SDRAM (3.3 V TTL), usable as AGP clocks
• Seven copies of BUS clock (synchronous with CPU
clock/2 or CPU/2.5 for 75 and 83.3 MHz CPU)
• CPU clocks to BUS clocks skew 1-4ns (CPU early)
• One IOAPIC clock @14.31818 MHz
• Two copies of Ref. clock @14.31818 MHz
• One each 48/ 24 MHz (3.3 V TTL)
• This device is configured into the Mobile mode for
power management of Intel 430 TX
• Ref. 14.31818 MHz Xtal oscillator input
• Separate 66/60 MHz select pin (LSB of select pins)
• Separate V_DD2 for four CPU and single IOAPIC output
buffers to allow 2.5V output (or Std. Vdd)
• Power Management Control Input pins
• 3.0V – 3.7V supply range w/2.5V compatible outputs
• 48-pin SSOP package
Block Diagram
Pin Configuration
9147-01Rev B 04/25/01
48-Pin SSOP
Pentium is a trademark of Intel Corporation
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.