MC88915TFN55

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC88915TFN55 is a low skew CMOS PLL clock driver designed for high-performance PC and workstation applications. It utilizes phase-locked loop technology to lock frequency and phase onto an input reference clock, distributing it with minimal delay. The device features five Q outputs (Q0–Q4) with less than 500 ps output-to-output skew, an inverted Q5 output, a 2X_Q output running at twice the Q frequency, and a Q/2 output. It supports input frequencies from 5 MHz up to the maximum operating frequency of 55 MHz for the 2X_Q output. The component operates on a single 5V supply and provides ±36 mA drive capability.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Five Q outputs (Q0-Q4) with output-to-output skew less than 500 ps
• Phase-locked loop technology for low skew clock distribution
• Supports frequency ratios of 1:2, 1:1, and 2:1 between SYNC input and Q outputs
• Includes LOCK indicator output to signal steady-state phase and frequency lock

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clock distribution for high performance PCs
• Clock distribution for workstations
• Synchronous distribution of central system clocks to multiple boards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer origin, as the datasheet identifies Motorola, Inc., while the prompt lists NXP USA Inc. Confirm the specific suffix 'FN' corresponds to the Plastic PLCC package (Case 776-02). Ensure the 55MHz variant matches the required operational frequency range and temperature specifications (-40°C to +85°C).

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when low skew (< 500 ps) is critical for synchronous board-level clock distribution. The TFN55 variant is suitable for systems requiring a maximum 2X_Q output frequency of 55 MHz. Consider the FREQ_SEL pin configuration if using low-frequency reference clocks to keep the VCO in its optimal range (> 20 MHz).

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MC88915T series includes variants for different maximum frequencies, including 55, 70, 100, 133, and 160 MHz versions. The MC88915TFN55 specifically denotes the 55 MHz maximum operating frequency version in a 28-Lead PLCC package. This family is designed to replace older clock drivers by providing integrated PLL functionality and lower skew characteristics.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

For a 3.3V application, the MC88LV915T data sheet should be consulted as the alternative. Other frequency variants within the same package include MC88915TFN70, MC88915TFN100, MC88915TFN133, and MC88915TFN160.