SN74ALS646A-1DWRE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS646A-1DWRE4 is an octal bus transceiver and register from the Texas Instruments 74ALS series. It features non-inverting data paths with 3-state outputs, designed for high-speed bidirectional data transfer. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 30 ns, low-level output current of 24 mA, and high-level output current of -15 mA. It accepts TTL input levels and provides TTL output levels. The component is housed in a 24-pin SOIC package and supports surface mount installation.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal registered architecture providing eight-bit data storage and transmission capabilities
• Non-inverting signal path ensuring direct logical correspondence between inputs and outputs
• Three-state output design enabling safe parallel connection to system buses without interference

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed bidirectional data bus architectures requiring registered buffering
• Memory-to-memory or memory-to-I/O data transfer interfaces
• Clocking circuits where registered data alignment is necessary

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'RE4' indicates tape and reel packaging when ordering. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the 24-SOIC footprint matches the target PCB layout. Validate that the 4.5V to 5.5V operating range aligns with the system power supply specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring ALS speed performance with registered output stages. Compare against standard 74ALS646 variants if reel packaging is mandatory. Consider the 30 ns propagation delay for timing budget analysis. Verify compatibility with TTL logic levels in the source circuitry to ensure proper signal interfacing.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the advanced Schottky (ALS) family of clamped TTL integrated circuits. It serves as a registered transceiver, combining bus driving capabilities with data latching functionality. The device is distinct from unregistered transceivers by its internal flip-flop structure, which stabilizes data during transitions.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS646ADW is a tube-packaged equivalent. SN74ALS646ADWR is a reel-packaged equivalent. SN74ALS646A-1DW is a variant with similar electrical characteristics but different packaging.