MC10H640FNR2G

Overview

The MC10H640FNR2G is a clock driver and distribution IC designed for 68030/040 microprocessors. It accepts TTL or PECL inputs and provides six TTL outputs with internal divide-by-two and divide-by-four stages. The device operates on a single +5.0 V supply (4.75V to 5.25V) and supports maximum input frequencies up to 135 MHz. It features asynchronous reset, differential PECL inputs, and extra power/ground pins. Packaged in a 28-lead PLCC (J-Lead), it ensures part-to-part and within-part skew compliance for MPU clock generation.

Feature Summary

• Generates clocks for 68030/040 MPUs meeting specific skew requirements
• Accepts TTL or PECL input clocks with internal differential processing
• Includes divide-by-two and divide-by-four stages for frequency division
• Asynchronous reset forces all Q outputs LOW and Q-bar outputs HIGH

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 RoHS compliance status of the MC10H640FNR2G before procurement. The datasheet indicates the device is Pb-Free, Halogen Free, and RoHS Compliant. Confirm that the 28-PLCC package matches the target PCB footprint dimensions of 11.51x11.51 mm. Ensure the operating temperature range of 0°C to 85°C aligns with the system environment.

Selection Notes

Select the MC10H640FNR2G when interfacing TTL or PECL sources to 68030/040 MPU clock inputs. The device requires a single +5.0 V supply. For duty cycle control at 50 MHz, limit load capacitance and/or power supply variation as specified in the datasheet figures. Verify that the 135 MHz maximum input frequency meets the source clock requirements.

Part Context

The MC10H640 belongs to the 10H logic family by onsemi, specialized for high-speed ECL/TTL applications. It is distinct from similar parts like the MC10H642, which has different output configurations. The 'FN' suffix denotes the 28-PLCC package, while 'G' indicates a Pb-Free/RoHS-compliant manufacturing process.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Check for pin-compatible alternatives within the 10H series if the MC10H640FNR2G is unavailable, ensuring voltage and speed specifications match.