MC88916DW80

Overview

The MC88916DW80 is a low skew CMOS PLL clock driver designed for CISC microprocessor and single processor RISC systems. It utilizes phase-locked loop technology to lock output frequency and phase onto an input reference clock, providing distribution with minimal delay. The device features three Q outputs (Q0–Q2) with less than 500ps skew, an inverted Q3 output, a 2X_Q output running at twice the system frequency, and a Q/2 feedback output. It supports a maximum SYNC input frequency of 50MHz, corresponding to an 80MHz 2X_Q output. The IC operates on a 4.5V to 5.5V supply and includes integrated processor reset functionality compatible with the MC68/EC/LC030/040 family.

Feature Summary

• PLL-based clock distribution with <500ps skew between Q0-Q2 outputs
• Integrated processor reset function with open-drain RST_OUT(LOCK) indicator
• Multiple output frequencies: Q, 2X_Q, Q/2, and inverted Q3
• TTL-compatible inputs driving CMOS or TTL loads with ±36mA drive strength

Applications

• Clock distribution for Motorola MC68030 microprocessors
• Clock generation for 33MHz and 40MHz MC68040 microprocessors
• Single processor RISC system timing solutions

Procurement Notes

Verify the ordering suffix 'DW80' corresponds to the 80MHz speed grade (80MHz max 2X_Q frequency). Confirm the package is 20-SOIC (Case 751D-04). Ensure the application environment supports the required 4.5V to 5.5V VCC supply range and -40°C to +85°C operating temperature.

Selection Notes

Select the MC88916DW80 when an 80MHz 2X_Q output is required for 33MHz or 40MHz processors. Use the DW70 variant if the maximum 2X_Q frequency requirement is limited to 70MHz. This component is suitable for designs requiring low skew distribution to multiple processor pins without external buffering.

Part Context

The MC88916 series was originally manufactured by Motorola and later transitioned through Freescale Semiconductor to NXP USA Inc. The part belongs to the legacy timing solutions portfolio, specifically designed for high-performance microprocessor clocking architectures prevalent in the 1990s and early 2000s.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult current NXP/Freescale timing solution catalogs for modern replacements, as this is a legacy component.