MC88915FN55R2

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC88915FN55R2 is a PLL-based clock driver IC manufactured by NXP USA Inc., originally designed by Motorola. It utilizes phase-locked loop technology to distribute low-skew clock signals for high-performance PCs and workstations. The device operates on a single 5V supply (4.75V to 5.25V) and features five Q outputs with less than 500 ps output-to-output skew. It supports input frequencies from 5 MHz up to the maximum operating frequency of 55 MHz at the 2X_Q output. The package is a 28-pin Plastic Leadless Chip Carrier (PLCC).

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Phase-Locked Loop (PLL) Technology: Locks low skew outputs' frequency and phase onto an input reference clock.
• Low Skew Outputs: Five Q outputs (Q0–Q4) provide output-to-output skew of less than 500 ps.
• Frequency Multiplication: Capable of multiplying low-frequency input clocks to higher system frequencies (2X_Q).
• Test Mode: Includes a PLL_EN pin to disable the VCO for low-frequency board testing.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clock distribution for high-performance personal computers.
• Clock distribution for workstation systems.
• Synchronous clock distribution across multiple boards using a central system clock.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer designation, as this component was originally developed by Motorola and is now part of the NXP portfolio. Confirm the specific suffix 'FN55' indicates the 55 MHz maximum operating frequency variant. Ensure the 28-pin PLCC package matches the target PCB footprint requirements.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the MC88915FN55R2 when a 5V CMOS/TTL compatible clock driver with sub-nanosecond skew is required. Choose the FN55 variant if the maximum operating frequency requirement is 55 MHz; otherwise, consider the FN70 variant for up to 70 MHz operation. Ensure the application can accommodate the 28-pin PLCC package.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MC88915 belongs to the 88915 series of PLL-based clock drivers. It is functionally similar to other variants in the series such as the MC88915TFN70R2, which offers a higher maximum frequency of 70 MHz. The device is part of the broader timing solutions portfolio previously managed by Motorola and currently maintained by NXP.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consider checking for cross-manufacturer equivalents or updated versions within the NXP/Renesas portfolio that maintain the 28-pin PLCC form factor and PLL functionality.