MC10H642FN

Overview

The MC10H642FN is a clock driver and distribution IC designed for 68030/040 microprocessors. It accepts TTL or PECL inputs and provides eight differential TTL outputs with a 2:8 input-to-output ratio. The device operates on a single +5.0 V supply (4.75V to 5.25V) and supports maximum frequencies up to 100 MHz. Key electrical parameters include part-to-part skew of 1.0 ns, within-device skew of 0.5 ns, and propagation delays ranging from 4.25 ns to 5.75 ns depending on the output stage. It features asynchronous reset and power-up synchronization.

Feature Summary

• Generates clocks for 68030/040 MPUs meeting specific skew requirements
• Accepts TTL or PECL (ECL referenced to +5.0 V) input sources
• Includes divide-by-two and divide-by-four stages for duty cycle control
• Provides extra TTL and PECL power/ground pins for improved performance

Applications

• Clock generation for Motorola 68030 microprocessors
• Clock generation for Motorola 68040 microprocessors
• High-speed clock distribution in MPU systems

Procurement Notes

Verify component authenticity through authorized channels as counterfeits exist. Confirm RoHS compliance status; standard FN suffix parts are not lead-free, while FNG suffix variants are Pb-Free. Check datasheet revision history for potential parameter updates before finalizing designs.

Selection Notes

Select the MC10H642FN when interfacing ECL/PECL sources to TTL loads in 68030/040 systems. Ensure the design accommodates the 28-PLCC package dimensions (11.51x11.51 mm). Verify that the application requires the specific 2:8 ratio and internal division stages provided by this device rather than a generic buffer.

Part Context

This component belongs to the MC10H/100H642 family, which includes the MC100H642 variant compatible with 100K logic levels. Both devices share identical pinouts and functional descriptions but differ in input voltage compatibility standards. The FN suffix denotes a standard plastic PLCC-28 package.

Replacement Considerations

MC100H642FN serves as a direct functional substitute with different input level compatibility (100K vs MECL 10H). MC10H642FNG is the lead-free equivalent of the same package type.