MC100H640FNR2

Overview

The MC100H640FNR2 is a single-circuit clock driver manufactured by onsemi, designed for ECL to TTL voltage level translation. It accepts differential PECL or TTL inputs and provides six TTL outputs with a 2:6 input-to-output ratio. The device operates within a supply voltage range of 4.75V to 5.25V and supports maximum frequencies up to 135MHz. Packaged in a 28-PLCC (J-Lead) surface-mount case measuring 11.51x11.51mm, it functions across an operating temperature range of 0°C to +85°C. This component lacks an internal PLL.

Feature Summary

• Translates differential PECL or TTL inputs to six TTL outputs
• Supports maximum operating frequency of 135MHz
• Designed specifically for 68030 and 68040 MPU clock distribution

Applications

• Clock generation and distribution for Motorola 68030 microprocessors
• Clock generation and distribution for Motorola 68040 microprocessors
• System timing circuits requiring ECL to TTL translation

Procurement Notes

Verify the specific revision status and RoHS compliance directly with onsemi or authorized distributors, as legacy H-series components may have varying environmental certifications. Confirm package availability and lead times through official channels, noting that standard packaging quantities typically apply to this PLCC variant.

Selection Notes

Select the MC100H640FNR2 when a 2:6 fan-out ratio is required for 68030/68040 systems. Ensure the design accommodates the 28-LCC J-Lead footprint. Verify that the load capacitance requirements are met within the specified 135MHz limit and that the 4.75V to 5.25V supply rail is stable for proper TTL output levels.

Part Context

This part belongs to the MC100H series of high-speed clock drivers from onsemi. It shares functional similarities with the MC10H640 but is optimized for higher performance characteristics. Related variants include the MC100H641 (1:9 ratio) and MC100H642 (2:8 ratio), offering different fan-out configurations for similar MPU applications.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the MC10H640FNR2G. For alternative fan-outs, consider the MC100H641FNR2G (1:9) or MC100H642FNR2G (2:8). Verify that any replacement maintains the required 135MHz speed and 28-PLCC package constraints.