MC10H642FNR2G

Overview

The MC10H642FNR2G is a clock driver and distribution IC designed for 68030/68040 microprocessors. It accepts TTL or PECL inputs and provides eight differential TTL outputs with divide-by-two and divide-by-four stages. The device operates on a single +5.0 V supply (4.75V to 5.25V) within an operating temperature range of 0°C to 85°C. It features asynchronous reset, part-to-part skew of 1.0 ns, and internal device skew of 0.5 ns. Maximum input frequency is 100 MHz. It is housed in a 28-PLCC surface-mount package.

Feature Summary

• Generates clocks for 68030/68040 MPUs with guaranteed skew specifications
• Accepts TTL or PECL input clock sources via Select pin
• Includes divide-by-two and divide-by-four output stages
• Asynchronous Reset function forces all Q outputs LOW

Applications

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

Procurement Notes

Verify the 'G' suffix indicates a lead-free package compliant with RoHS standards. Confirm the 'R2' suffix corresponds to tape and reel packaging containing 500 units per reel. Ensure the specific ordering code matches the required Pb-Free variant for environmental compliance requirements.

Selection Notes

Select this component when interfacing ECL/PECL sources with TTL-based MPU architectures. The device supports both single-ended TTL and differential PECL inputs. Verify that the application requires the specific 2:8 ratio and the integrated divide-by-two/four functionality for duty cycle control.

Part Context

This part belongs to the MC10H/100H642 family. The '10H' designation signifies compatibility with MECL 10H logic levels, while the '100H' version supports 100K levels referenced to +5.0 V. Both variants share identical pinouts and functional characteristics for generating processor clocks.

Replacement Considerations

The MC100H642FNR2G serves as a direct functional equivalent within the same family, differing only in input level compatibility (100K vs MECL 10H). Other parts in the MC10H series are not directly interchangeable due to differing logic functions.