74AC240SJ

Buffers, Drivers, Receivers, Transceivers Overview

The Fairchild Semiconductor 74AC240SJ is an octal bus buffer and line driver featuring inverted 3-STATE outputs. It belongs to the AC series of CMOS logic devices, designed for high-speed applications with low power dissipation. The component provides symmetrical output impedance and balanced propagation delays, making it suitable for driving bus lines or buffering memory address registers. It operates within a voltage range compatible with standard 5V systems and offers improved latch-up immunity.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Inverting 3-STATE outputs capable of driving bus lines or buffering memory address registers
• Outputs source and sink currents up to 24mA for robust signal transmission
• TTL-compatible inputs ensuring interoperability with various logic families
• High noise immunity and symmetrical output impedance for reliable data integrity

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers in computer systems
• Clock distribution networks
• Bus-oriented transmitters and receivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix SJ corresponds to the SOIC-20 plastic package when sourcing. Confirm RoHS compliance status as manufacturing practices evolve. Ensure the supplier provides official datasheets from Fairchild or authorized successors like onsemi to validate electrical characteristics and pinout compatibility before integration into designs.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring octal buffering with inverted logic and high drive capability. It is appropriate where 3-STATE control is necessary for bus sharing. Consider the AC series speed-power trade-offs compared to ACT variants if TTL input compatibility is strictly required alongside lower power consumption.

Buffers, Drivers, Receivers, Transceivers Part Context

This device is part of the widely adopted 74AC logic family, known for offering higher speeds than standard 74LS series while maintaining CMOS low power advantages. The 74AC240 specifically addresses the need for bidirectional or unidirectional octal buffering in complex digital systems, serving as a critical interface between microprocessors and peripheral memory or I/O devices.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The 74ACT240 serves as a functional substitute with identical pinouts but includes TTL-compatible inputs. Other manufacturers such as STMicroelectronics and onsemi produce equivalent octal bus buffers in the 74AC240 family that maintain electrical and mechanical compatibility.