ICS9248-98 is a frequency generator produced by Integrated Circuit Systems, Inc. It supports 2.5V CPUs and has an output frequency of up to 166MHz. It supports PCI, CPU stop and Mode power management functions.
The document describes the ICS9248-98 single‑chip clock solution for desktop designs. It includes a general description, pin configuration, and detailed serial programming information for setting frequencies, spread‑spectrum, and power‑management features.
Additional sections cover skew specifications, timing diagrams for CLK_STOP# and PCI_STOP#, layout recommendations, and ordering information. The handbook also lists default register values and provides a complete pin‑out table with voltage supplies.
| Maximum Frequency Support | 166 MHz |
|---|---|
| VDD1 Supply Voltage | 3.3 V |
| VDD2 Supply Voltage | 3.3 V |
| VDD3 Supply Voltage | 3.3 V |
| VDDL1 Supply Voltage | 2.5 V |
| CPU‑CPU Skew | < 175 ps |
| PCI‑PCI Skew | < 500 ps |
| Data Transfer Rate | ≤ 100 kbps |
The default data transfer rate is 100 kbps or less.
VDD1 requires a nominal 3.3 V supply.
The device supports frequencies up to 166 MHz.