ICS9248DF-39T

Overview

The ICS9248DF-39T is a processor-specific clock generator and buffer integrated circuit manufactured by Renesas Electronics Corporation. Designed for Intel Pentium Pro systems, it generates up to 26 distinct clock outputs from a single crystal input. The device operates within a supply voltage range of 3.135V to 3.465V and supports maximum frequencies of 150MHz. It utilizes a 48-pin SSOP package with a width of 7.50mm. The component functions without differential signaling and is rated for an operating temperature range of 0°C to 70°C.

Feature Summary

• Generates multiple clock signals (up to 26 outputs) for high-speed microprocessor systems
• Supports external reference frequency multiplying factors for smooth frequency transitions
• Includes dedicated CPU, PCI, and SDRAM clock outputs
• Operates on a single 3.3V nominal power supply

Applications

• Intel Pentium Pro based computer systems
• Cyrix microprocessor platforms
• High-speed RISC or CISC system designs requiring specific clock generation

Procurement Notes

Verify the manufacturer part number against official Renesas documentation to confirm the 'T' suffix indicates tape and reel packaging. Ensure the 48-SSOP footprint matches the target PCB design. Check RoHS compliance status as manufacturing processes may evolve over time.

Selection Notes

Select this component when designing for legacy Intel Pentium Pro architectures requiring a fixed set of clock ratios. It is suitable for applications needing simultaneous CPU, PCI, and memory clocks without complex programmability. Compare against newer VersaClock series if flexible configuration is required.

Part Context

This part belongs to the IDT/Integrated Circuit Systems line of timing components, now under Renesas Electronics. It is part of a family of processorspecific clock generators designed to simplify board layout by integrating multiple clock buffers into a single chip.

Replacement Considerations

Consult Renesas datasheets for direct pincompatible replacements or functional equivalents in the ICS9248 series. Verify that any substitute maintains the 1:26 ratio capability and 150MHz frequency limit.