SN74ALS623AN3

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS623AN is an octal bus transceiver from the Texas Instruments SN74ALS series, housed in a standard plastic 20-pin DIP package. It provides asynchronous two-way communication between data buses with local bus-latch capability and supports true logic output. The device operates within a supply voltage range of 4.5 V to 5.5 V and features dual output-enable inputs (OEAB and OEBA) for flexible timing control. Electrical characteristics include a low-level output current of 24 mA and high-level output current of -15 mA. Propagation delays are specified between 2 ns and 19 ns depending on the signal path and enable state.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous bidirectional data transmission between two independent 8-bit buses
• Features dual output-enable inputs that allow simultaneous enabling for local bus-latch functionality
• Supports true logic output configuration with three-state outputs

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous communication interfaces between microprocessor buses and peripheral devices
• Local bus-latch applications requiring simultaneous data storage across two bus sets
• Bidirectional data routing in memory systems or I/O expansion architectures

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and material finish. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement. Ensure the selected variant matches the required operating temperature range and pinout configuration for your application design.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal-width bidirectional data transfer with precise control over bus isolation and directionality. The dual-enable architecture is suitable for applications needing local latching without external flip-flops. Consider the ALS series power consumption and speed trade-offs compared to standard or AS variants for optimal system performance.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS family of octal bus transceivers, which includes variants like the SN74ALS620A and SN74ALS621A. These devices share similar functional descriptions but differ in output logic types, such as inverting or open-collector configurations. The SN74ALS623AN specifically offers true logic outputs with three-state capabilities, distinguishing it from other members of the same datasheet family.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS623ADW

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74ALS623AN achieve local bus-latch capability?

By simultaneously enabling both the OEAB and OEBA inputs while all other data sources to the bus lines are in a high-impedance state, the device reinforces its input at the output, effectively storing the last state of the 8-bit codes on both bus sets.

What is the function of the OEAB and OEBA inputs?

These dual output-enable inputs control the direction of data flow. Enabling OEAB allows data transmission from the A bus to the B bus, while enabling OEBA allows transmission from the B bus to the A bus. Disabling both isolates the buses.