MC88915TFN70R2

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC88915TFN70R2 is a low skew CMOS PLL clock driver manufactured by NXP USA Inc. (originally Motorola). It operates at a maximum frequency of 70 MHz on the 2X_Q output, with Q outputs running at 35 MHz. The device features five phase-locked outputs (Q0–Q4) with less than 500 ps skew, an inverted Q5 output, and a divide-by-two Q/2 output. It accepts TTL-compatible inputs and provides ±36 mA drive capability for CMOS/TTL loads. Powered by 4.75V to 5.25V, it utilizes a 28-lead PLCC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Phase-Locked Loop (PLL) technology ensures zero-delay distribution of clock signals to multiple components.
• Five Q outputs (Q0-Q4) maintain output-to-output skew under 500 ps.
• Programmable frequency ratios (1:2, 1:1, 2:1) via FREQ_SEL pin and feedback configuration.
• Includes LOCK indicator output and test mode capabilities via PLL_EN pin.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clock distribution for high-performance personal computers and workstations.
• Synchronous clock distribution across multiple boards using a central reference.
• Multiplying low-frequency input clocks to higher system frequencies.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity as the part status is listed as discontinued. Confirm the specific TFN70 speed grade matches design requirements. Check RoHS compliance status, as older Motorola/NXP variants may not meet current environmental standards. Ensure the 28-PLCC footprint aligns with existing PCB layouts.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a 70 MHz maximum 2X_Q frequency is required. Compare against MC88915TFN55 for lower frequency needs or MC88915TFN100/133/160 for higher performance. Verify that the 5V supply voltage range suits the target system power rails. Consider the MC88LV915T if a 3.3V interface is necessary instead of standard 5V logic levels.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the MC88915T family of low skew CMOS PLL clock drivers. Originally developed by Motorola, the product line was later acquired by NXP. The 'TFN' suffix denotes the plastic PLCC package variant, while '70' specifies the 70 MHz operational limit. The 'R2' indicates tape and reel packaging.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. For 3.3V applications, the MC88LV915T is referenced as a related alternative within the same functional category.