9179BF-01LF

Clock Buffers, Drivers Overview

The Renesas Electronics Corporation 9179BF-01LF is a low skew, non-inverting fanout buffer designed for SDRAM clock distribution in high-speed microprocessor systems. It provides one input to eighteen outputs (1:18 ratio) with a maximum frequency of 150 MHz. The device operates on a 3.135V to 3.465V supply and features synchronous clocks matched to a 250ps skew window. It utilizes an I2C serial configuration interface for individual output control and includes a tri-state pin for testing. The component is housed in a 48-pin SSOP package.

Clock Buffers, Drivers Feature Summary

• Generates up to four SDRAM DIMM clock buffers with low output-to-output skew.
• Supports I2C serial configuration to enable or stop individual clock outputs for EMI reduction.
• Includes a dedicated OE pin that tristates all outputs when held LOW.
• Features multiple VDD and GND pins to minimize noise in the power distribution network.

Clock Buffers, Drivers Applications

• SDRAM clock buffering for Intel PentiumPro or Pentium II systems.
• High-speed RISC or CISC microprocessor system designs.
• Feedback applications for phase synchronization to a master clock via external PLL stages.

Clock Buffers, Drivers Procurement Notes

Verify the manufacturer designation as Integrated Circuit Systems, Inc., now part of Renesas, as indicated by the datasheet header. Confirm RoHS compliance status based on the 'LF' suffix in the ordering information. Check current availability as this specific part number may be subject to discontinuation notices common in legacy clock buffer families.

Clock Buffers, Drivers Selection Notes

Select this component for applications requiring a 1:18 fanout buffer without internal PLL functionality. Ensure the design supports the 3.3V nominal supply range (3.135V–3.465V). Verify PCB layout capabilities for ground planes and series termination resistors to maintain the specified 250ps skew performance.

Clock Buffers, Drivers Part Context

This part belongs to the ICS9179B family of clock buffers. The 'F' suffix denotes the 48-pin SSOP package, while 'LF' indicates a lead-free configuration compliant with RoHS standards. It serves as a direct replacement for earlier versions like the ICS9179B-01 in compatible form factors.

Clock Buffers, Drivers Replacement Considerations

The ICS9179B-01 is the primary equivalent part number. When substituting, ensure the replacement supports the same 48-pin SSOP footprint and 3.3V logic levels. Verify that the alternative device maintains the 250ps skew specification required for SDRAM timing integrity.