MC10H642FNR2

Overview

The MC10H642FNR2 is a clock driver and distribution IC designed for 68030/68040 microprocessors. It accepts differential PECL or single-ended TTL inputs and provides eight TTL outputs with a 2:8 input-to-output ratio. The device integrates divide-by-two and divide-by-four stages to generate required clock frequencies, supporting maximum input frequencies up to 100 MHz. It operates on a single +5.0 V supply (4.75V to 5.25V) within an operating temperature range of 0°C to 85°C. Packaged in a 28-PLCC surface-mount case, it ensures low part-to-part and within-device skew.

Feature Summary

• Generates clocks for 68030/68040 MPUs with guaranteed skew specifications
• Accepts both TTL and PECL (ECL referenced to +5.0 V) input sources
• Includes internal divide-by-two and divide-by-four stages
• Provides asynchronous reset functionality

Applications

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

Procurement Notes

Verify component authenticity through authorized channels as the MC10H642FNR2 is listed as obsolete by the manufacturer. Confirm RoHS compliance status, as standard versions may not meet current environmental regulations. Check for available surplus stock from third-party distributors if original manufacturing supply is unavailable.

Selection Notes

Select this component when designing systems specifically targeting 68030 or 68040 MPU architectures. Ensure the design accommodates the 28-PLCC package dimensions and requires differential PECL or TTL input compatibility. Verify that the 100 MHz maximum frequency meets system timing requirements and that power supply constraints align with the single +5.0 V operation.

Part Context

This part belongs to the MC10H/100H642 series, which includes variants like MC100H642FNR2. The '10' prefix indicates compatibility with MECL 10H ECL logic levels, while '100' denotes compatibility with 100K levels. The FNR2 suffix specifies the PLCC-28 tape and reel packaging configuration.

Replacement Considerations

MC100H642FNR2 is a functional equivalent within the same family offering identical electrical characteristics but compatible with 100K logic levels instead of MECL 10H.