General Description

The ICS9169C-41 is a Clock Synthesize/Driver chip for Pentium, PentiumPro or Cyrix 68x86 based motherboards using SDRAM.

Features include four dual purpose I/O pins which provide extra CPU clocks and enable the part to be packaged in a low-cost 34-pin SSOP package. These four pins latch the select inputs at the internal Power-On Reset. Additionally, the device meets the Pentium and PentiumPro power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up.

Features

• 12 selectable CPU/SDRAM/AGP clocks up to 75 MHz

• Six PCI clocks, synchronous or asynchronous mode, pin selectable by Bus Select input (pin 19)

• One USB clock at 48MHz, meets Intel jitter, accuracy, as well as rise and fall time requirements

• One I/O clock at 24MHz

• Two Ref. Clocks at 14.318MHz

• CPU clocks to PCI clock skew of 1-4ns (CPU early)

• Low CPU and PCI clock jitter <200ps

• Low skew outputs, skew window 250ps for CPU clocks and for PCI clocks

• Improved output drivers are designed for low EMI

• Test Mode

• 3.3V ±10 operation

• Space saving and low cost 34-pin SSOP package