SN74ALS243AD

Overview

The SN74ALS243AD is a quadruple bus transceiver from the Texas Instruments SN74ALS243A series, designed for asynchronous two-way communication between data buses. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature range of 0°C to 70°C. The device features dual output-enable inputs (OEAB and OEBA) that control data transmission direction or isolate the buses. In a specific configuration where both enable inputs are active, the device functions as a latch, retaining identical 4-bit codes on both sets of bus lines.

Feature Summary

• Dual-output-enable configuration allows flexible timing control for maximum design flexibility
• P-N-P input structure reduces DC loading on connected data buses
• Simultaneous enable capability enables data storage by isolating and reinforcing bus states

Applications

• Asynchronous two-way communication between data buses
• Bus isolation to prevent signal interference
• Data latching applications requiring state retention across bus lines

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the package type matches the required SOIC-14 specification. Ensure the operating temperature range aligns with the system's environmental requirements. Check for RoHS compliance status if applicable to your manufacturing standards. Validate that the obsolete status does not conflict with long-term availability needs.

Selection Notes

Select this component when designing systems requiring bidirectional data transfer with precise control over bus isolation. The ALS logic family offers faster switching speeds compared to standard LS devices. Consider the dual-enable feature for applications needing simultaneous data capture. Verify that the 14-pin SOIC package fits the available PCB footprint constraints.

Part Context

This part belongs to the SN74ALS243A family of quadruple bus transceivers manufactured by Texas Instruments. The 'D' suffix indicates a plastic small-outline package. The device is part of the broader 74-series logic family, specifically optimized for high-speed applications using Advanced Low-power Schottky technology.

Replacement Considerations

Public confirmed substitute part numbers: SN74ALS243AN, SN74ALS243ANSR.