9248DF-39LFT

Application Specific Clock/Timing Overview

The ICS9248DF-39LFT is a processor-specific clock generator manufactured by Integrated Device Technology (IDT), now part of Renesas Electronics. It operates at a maximum output frequency of 150 MHz and is housed in a 48-pin SSOP package with dimensions of 0.300 inches. The device generates multiple clock signals required for high-speed microprocessor systems, including Intel Pentium Pro or Cyrix architectures. It features eight externally selectable reference frequency multiplying factors to allow smooth frequency transitions. The component supports two CPU clocks, six PCI clocks, and thirteen SDRAM clocks, along with two reference outputs.

Application Specific Clock/Timing Feature Summary

• Generates all necessary clocks for high-speed RISC or CISC microprocessor systems such as Intel Pentium Pro.
• Provides eight different reference frequency multiplying factors that are externally selectable.
• Outputs include two CPU clocks, six PCI clocks, and thirteen SDRAM clocks.
• Includes two reference outputs equal to the input reference frequency.

Application Specific Clock/Timing Applications

• Intel Pentium Pro processor systems
• Cyrix microprocessor systems
• High-speed RISC microprocessor platforms
• High-speed CISC microprocessor platforms

Application Specific Clock/Timing Procurement Notes

Verify manufacturer lineage as IDT was acquired by Renesas. Confirm package type is SSOP-48 and max frequency is 150 MHz. Check RoHS compliance status e3. Ensure lead-free specification matches project requirements. Validate pin count is 48.

Application Specific Clock/Timing Selection Notes

Select this component when designing for Pentium Pro or Cyrix processors requiring specific clock distributions. Ensure external circuitry supports the eight selectable multiplying factors. Verify voltage levels match system requirements. Consider thermal dissipation within the SSOP-48 package limits.

Application Specific Clock/Timing Part Context

This part belongs to the ICS9248 family of frequency generators designed specifically for legacy high-performance processors. It integrates buffer functions alongside clock generation. The '39' suffix typically denotes a specific speed grade or configuration variant within the series.

Application Specific Clock/Timing Replacement Considerations

Check for direct cross-references from IDT/Renesas documentation. Verify electrical compatibility for Pentium Pro/Cyrix systems. Ensure pinout and package dimensions match existing PCB layouts.