MC100H642FNR2G

Overview

The MC100H642FNR2G is a single-supply clock driver designed for 68030 and 68040 microprocessors. It translates differential PECL or TTL inputs into eight TTL outputs with guaranteed part-to-part and within-device skew. The device includes divide-by-two and divide-by-four stages to generate required MPU clocks, such as 50 MHz and 25 MHz from a 100 MHz input. It operates on a single +5.0 V supply (4.75V to 5.25V) and supports frequencies up to 100 MHz. Packaged in a PLCC-28 surface-mount case.

Feature Summary

• Generates clocks for 68030/040 MPUs with guaranteed skew specifications
• Accepts either TTL or PECL (ECL referenced to +5.0 V) input clocks
• Includes internal divide-by-two and divide-by-four stages
• Features asynchronous reset and extra power/ground pins

Applications

• Clock generation for Motorola 68030 microprocessors
• Clock generation for Motorola 68040 microprocessors
• Differential PECL to TTL clock distribution systems

Procurement Notes

Verify the RoHS status of the specific batch, as datasheets indicate lead-free packages are available but earlier versions may not comply. Confirm the 'G' suffix denotes Pb-Free construction. Check current availability as this component series has been subject to discontinuation notices by the manufacturer.

Selection Notes

Select the MC100H642 variant when the system requires compatibility with 100K ECL levels referenced to +5.0 V. Use the MC10H642 if MECL 10H logic levels are required. Ensure the application utilizes a single +5.0 V supply and requires low skew performance for high-speed processor clocking.

Part Context

This component belongs to the MC10H/100H642 family of clock drivers. The '100H' designation specifically indicates compatibility with 100K ECL voltage levels referenced to +5.0 V, distinguishing it from the '10H' version which supports MECL 10H levels. Both variants share identical pinouts and functional logic.

Replacement Considerations

Public confirmed substitute part numbers: MC10H642FNR2G.