MC88916EG70

Overview

The MC88916EG70 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 six outputs: three Q outputs (Q0–Q2) with less than 500ps skew, one inverted Q3 output, a 2X_Q output running at twice the system frequency, and a Q/2 output. It includes a dedicated processor reset function via RST_IN/RST_OUT pins and operates on a 4.5V to 5.5V supply in a 20-SOIC package.

Feature Summary

• PLL-based clock distribution with <500ps skew between Q0-Q2 outputs
• Integrated processor reset functionality compatible with 68030/040 families
• Six total outputs including 2X_Q, Q/2, and inverted Q3
• TTL-compatible inputs with ±36mA CMOS drive capability

Applications

• Clock distribution for Motorola 68030 microprocessor family
• Clock generation for 33MHz and 40MHz 68040 microprocessors
• Single processor RISC system clocking

Procurement Notes

Verify the specific suffix 'EG' against official documentation, as standard datasheets list 'DW' variants. Confirm current manufacturing status and availability through authorized distributors or Renesas/IDT channels, as original Motorola production may have transitioned to Freescale or IDT.

Selection Notes

Select the MC88916EG70 for applications requiring a 70MHz maximum 2X_Q output frequency. Ensure the design accommodates the required 1MΩ reference resistor for jitter reduction and proper loop filter components. Verify that the 2X_Q duty cycle meets requirements if used for lower frequency 68040 processors, as it may not satisfy strict PCLK specifications for those specific cases.

Part Context

Originally manufactured by Motorola, this component was part of the timing solutions portfolio. Following corporate acquisitions, the product line moved through Freescale Semiconductor and is now managed by Integrated Device Technology (IDT), which has been acquired by Renesas Electronics Corporation. The device remains a specialized clock driver for legacy high-performance microprocessor architectures.

Replacement Considerations

The MC88916DW80 offers an 80MHz speed grade. For 68040 PCLK/BCLK requirements at lower frequencies, the MC88920 is specifically designed to meet stricter duty cycle specifications.