ICS954127BF

Overview

The ICS954127BF is a clock/frequency synthesizer IC manufactured by Renesas Electronics Corporation, designed for Intel CPU and PCI Express (PCIe) applications. It operates with a single circuit providing one clock output at a maximum frequency of 400MHz. The device requires a 3.3V supply voltage and functions within an operating temperature range of 0°C to 70°C. It is housed in a 56-BSSOP surface-mount package with a width of 7.50mm. This component does not include an internal PLL.

Feature Summary

• Designed specifically for Intel CPU and PCI Express (PCIe) timing requirements
• Provides a single clock output with a maximum frequency of 400MHz
• Operates on a 3.3V supply voltage without an integrated PLL
• Available in a 56-SSOP surface-mount package

Applications

• Intel CPU clock generation
• PCI Express (PCIe) system timing

Procurement Notes

The ICS954127BF is listed as obsolete or discontinued, with a discontinuation date noted around July 28, 2022. It is not RoHS compliant. Verification of current availability through authorized distributors or secondary markets is required before procurement planning.

Selection Notes

Select this component only if the design specifically targets legacy Intel CPU or PCIe architectures requiring a 400MHz clock source. Ensure the 56-SSOP footprint fits the PCB layout. Note that the absence of an internal PLL limits flexibility compared to programmable synthesizers. Verify compatibility with the 3.3V logic levels and industrial temperature range constraints.

Part Context

This part belongs to the ICS954127 series from Renesas, focusing on application-specific clock control for Hub P4 platforms. It serves as a fixed-function solution rather than a general-purpose programmable clock generator, targeting specific motherboard designs from the era of Intel's early PCIe adoption.

Replacement Considerations

As the ICS954127BF is discontinued, direct substitutes may be limited. Engineers should evaluate newer Renesas clock generators or generic PCIe clock synthesizers that match the 400MHz frequency, 3.3V operation, and 56-pin package constraints. Pin-to-pin replacements are unlikely; functional equivalence must be verified.