74FCT240ASC

Buffers, Drivers, Receivers, Transceivers Overview

The 74FCT240ASC is a dual four-bit bus driver manufactured by National Semiconductor, belonging to the FCT logic family. It features inverted outputs with three-state capability and operates within a supply voltage range of 4.75V to 5.25V. The device utilizes CMOS technology and is housed in a 20-pin plastic small outline integrated circuit package. It supports an operating temperature range from -40°C to 85°C and exhibits a typical propagation delay of 4.3 nanoseconds at nominal supply conditions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual four-bit configuration providing independent control over two data buses
• Inverted output polarity for signal inversion applications
• Three-state outputs allowing isolation of disconnected devices on a bus
• CMOS construction ensuring low power consumption and high noise immunity

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed data bus buffering in computer systems
• Clock distribution networks requiring signal inversion
• Memory interface circuits for address and data lines
• General-purpose digital logic level translation between compatible families

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the manufacturer designation as National Semiconductor or its successor entities, noting that original production may be discontinued. Confirm the specific suffix 'ASC' corresponds to the intended package type and temperature grade. Ensure compatibility with existing system voltage levels and load requirements before integration. Cross-reference datasheets for any revisions or obsolescence notices related to this specific part number.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a dual four-bit inverted buffer with three-state outputs is required for FCT-compatible logic systems. Consider the 20-pin SOIC package constraints for PCB layout. Evaluate the 4.75V to 5.25V supply requirement against available power rails. Compare propagation delay specifications if timing margins are critical for the target application frequency.

Buffers, Drivers, Receivers, Transceivers Part Context

This device is part of the broader 74FCT series, designed for high-speed CMOS applications. It serves as a standard solution for buffering and driving bus lines in digital electronics. The FCT family offers performance improvements over earlier TTL equivalents while maintaining pin compatibility. National Semiconductor contributed significantly to the development of this logic family before industry consolidations.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Check for direct replacements from Texas Instruments, such as the CY74FCT240 series, which shares functional similarities. Verify pinout compatibility and electrical characteristics like drive strength and delay times. Ensure the replacement package matches the physical footprint requirements of the existing design.