MC100H642FNR2

Overview

The MC100H642FNR2 is a clock driver designed for 68030 and 68040 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 frequencies up to 100 MHz. It includes internal divide-by-two and divide-by-four stages, asynchronous reset functionality, and meets strict part-to-part and within-part skew requirements. The component is housed in a 28-PLCC surface-mount package.

Feature Summary

• Generates clocks for 68030/040 MPUs with guaranteed skew specifications
• Accepts TTL or PECL (ECL referenced to +5.0 V) input signals
• Includes internal ÷2 and ÷4 frequency division stages
• Features asynchronous reset and power-up synchronization

Applications

• Clock generation for Motorola 68030 microprocessors
• Clock generation for Motorola 68040 microprocessors
• High-speed clock distribution systems requiring low skew

Procurement Notes

Verify RoHS compliance status as the standard MC100H642FNR2 may not be compliant; Pb-free versions exist with a 'G' suffix. Confirm availability through authorized distributors or secondary markets like Rochester Electronics, as the component has reached end-of-life status. Ensure proper handling of ECL/TTL interface requirements during integration.

Selection Notes

Select the MC100H642FNR2 when interfacing with 100K logic levels rather than MECL 10H levels used by the MC10H642 variant. Consider the 28-PLCC package constraints for PCB layout. Evaluate load capacitance limits to maintain duty cycle accuracy at target frequencies, particularly above 50 MHz.

Part Context

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

Replacement Considerations

The MC10H642FNR2 serves as a direct functional substitute if the system utilizes MECL 10H logic levels instead of 100K levels. Verify that the replacement matches the required input voltage thresholds and logic family compatibility before implementation.