MC100H643FNR2G

Clock Buffers, Drivers Overview

The MC100H643FNR2G is a high-performance clock fanout buffer manufactured by onsemi, designed for precise clock distribution in complex digital systems. It operates as a dual-supply ECL to TTL 1:8 clock driver, converting low-voltage differential ECL signals into single-ended TTL outputs. The device supports a maximum operating frequency of 80 MHz and functions within a supply voltage range of 4.2 V to 5.7 V. It is housed in a 28-pin PLCC package with surface-mount installation capabilities. The component ensures reliable signal integrity across an operating temperature range of 0°C to +85°C, making it suitable for demanding industrial and commercial applications requiring robust clock management.

Clock Buffers, Drivers Feature Summary

• Converts differential ECL input signals to single-ended TTL outputs for versatile logic compatibility
• Provides one-to-eight fanout capability to distribute clock signals to multiple destinations simultaneously
• Supports high-speed operation up to 80 MHz for efficient data synchronization
• Utilizes dual-supply architecture to bridge different voltage level requirements

Clock Buffers, Drivers Applications

• High-speed computer system clock distribution networks
• Telecommunications infrastructure requiring precise timing signals
• Industrial control systems needing reliable clock synchronization
• Test and measurement equipment utilizing ECL/TTL hybrid architectures

Clock Buffers, Drivers Procurement Notes

Verify the specific suffix 'R2G' against official onsemi documentation to confirm tape-and-reel packaging and RoHS compliance status. Ensure the procurement channel provides valid traceability for this integrated circuit. Cross-reference the part number with current obsolescence notices or lifecycle announcements from the manufacturer. Confirm that the received components match the 28-PLCC physical dimensions and pinout specifications detailed in the official datasheet before integration into production designs.

Clock Buffers, Drivers Selection Notes

Select this component when a design requires translating ECL clock sources to drive multiple TTL-based loads without external buffering. Consider the 80 MHz frequency limit to ensure it meets the system's timing requirements. Evaluate the thermal performance within the specified 0°C to +85°C range for the intended environment. Compare the 1:8 output ratio against other fanout buffers if higher or lower distribution counts are needed. Verify power supply constraints align with the dual-supply operational requirements.

Clock Buffers, Drivers Part Context

This device belongs to the MC100E/H series of clock drivers and buffers from onsemi, which are widely used in high-speed digital applications. The MC100H643 specifically addresses the need for ECL-to-TTL translation with significant fanout. It complements other family members like the MC100E211, though differing in voltage levels and output types. The series is known for providing stable clock distribution in telecommunications and computing environments where signal integrity is critical.

Clock Buffers, Drivers Replacement Considerations

Direct substitutes may include other 1:8 ECL-to-TTL clock drivers from onsemi or compatible manufacturers offering similar PLCC-28 packages. Verify electrical parameters such as propagation delay and output swing against the original specification. Check for pin-compatible alternatives if board space is constrained. Ensure any replacement maintains the 80 MHz operational frequency and dual-supply voltage requirements.