MC100H640FN

Overview

The MC100H640FN is a single-circuit clock driver manufactured by onsemi, designed for ECL to TTL translation. It supports PECL and TTL inputs with six TTL outputs, providing a 2:6 input-to-output ratio. The device operates within a supply voltage range of 4.75V to 5.25V and achieves a maximum frequency of 135MHz. It features differential inputs and outputs, ensuring low skew performance. Packaged in a 28-PLCC (J-Lead) surface-mount case measuring 11.51x11.51mm, it functions reliably across an operating temperature range of 0°C to 85°C.

Feature Summary

• Translates PECL or TTL differential inputs to six TTL outputs
• Maximum operating frequency of 135MHz
• Differential input and output configuration for low skew
• Single circuit design optimized for 68030/68040 MPUs

Applications

• Clock distribution for Motorola 68030 microprocessors
• Clock distribution for Motorola 68040 microprocessors
• High-speed digital system timing networks

Procurement Notes

Verify the specific suffix 'FN' against the manufacturer datasheet to confirm package type and lead finish specifications. Confirm RoHS compliance status as older variants may differ. Ensure the 28-PLCC footprint matches the target PCB layout dimensions of 11.51x11.51mm before finalizing procurement.

Selection Notes

Select this component when a 1:6 fan-out from a differential source to TTL loads is required at frequencies up to 135MHz. It serves as a direct replacement for similar H640 series devices. Verify that the 5V supply rail aligns with the 4.75V–5.25V operating range. Consider the 28-PLCC package constraints if space is limited compared to larger QFP options.

Part Context

This part belongs to the onsemi H640/H641/H642 family of clock drivers. These devices are specifically engineered for translating high-speed ECL signals to TTL levels for legacy microprocessor systems. The MC100H640FN variant utilizes the PLCC-28 package, distinguishing it from tape-and-reel versions like the FNR2 suffix.

Replacement Considerations

Check for MC100H640FNR2 as a potential alternative with identical electrical characteristics but different packaging. Verify pinout compatibility between PLCC and other 28-pin packages if considering physical substitution.