MC74HC640AN

Overview

The MC74HC640AN is an octal buffer and line driver manufactured by onsemi, belonging to the 74HC logic family. It features eight non-inverting buffers with high-impedance outputs designed for driving bus lines or other high-capacitance loads. The device operates within a supply voltage range of 2 V to 6 V, ensuring compatibility with various digital systems. It provides an output drive capability sufficient for 15 LSTTL loads and exhibits low input current of 1 µA. The component meets JEDEC standard 7A requirements and offers high noise immunity characteristic of CMOS devices.

Feature Summary

• Provides eight non-inverting buffer channels for signal conditioning
• Features high-impedance outputs suitable for bus driving applications
• Operates across a wide supply voltage range from 2 V to 6 V
• Delivers output drive strength capable of supporting 15 LSTTL loads

Applications

• Driving high-capacitance loads in digital circuits
• Bus line buffering and signal isolation
• Interface between different logic families such as CMOS and TTL

Procurement Notes

Verify the package type matches the required SOIC-14 configuration. Confirm the operating temperature range aligns with system specifications. Ensure the logic family corresponds to the design's voltage and speed requirements. Check for any specific ordering suffixes that may indicate tape-and-reel packaging versus tube quantities if applicable to the manufacturing process.

Selection Notes

Select this component when an octal non-inverting buffer with high drive capability is required. It is suitable for designs needing interface between CMOS and TTL levels. Consider the 2 V to 6 V supply range for flexibility. Evaluate the 15 LSTTL load capacity against fan-out requirements. Verify package availability in SOIC-14 for surface mount assembly.

Part Context

This part belongs to onsemi's 74HC series of high-speed CMOS logic devices. The 74HC family is known for compatibility with standard TTL logic levels while offering improved speed and lower power consumption compared to older HC variants. The MC74HC640AN specifically addresses the need for multiple buffered outputs in a single package, simplifying board layout for complex digital systems.

Replacement Considerations

Compatible substitutes include MM74HC640N and SN74HC640N. Verify pinout compatibility and electrical characteristics before substitution. Ensure the alternative part supports the same voltage range and drive current capabilities.