SN74ALS857DW

Overview

The SN74ALS857DW is an octal bus transceiver and register manufactured by Texas Instruments. It belongs to the ALS logic series and features eight circuits with three-state outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V. It exhibits a propagation delay of 64 ns, with low-level output current of 24 mA and high-level output current of -15 mA. Input and output levels are TTL compatible. The component functions as an inverting bus transceiver or register and is housed in a 24-pin SOIC package.

Feature Summary

• Integrates octal bus transceiver and register functionality within a single integrated circuit
• Provides three-state outputs for effective bus line management
• Supports TTL input and output logic levels for system compatibility

Applications

• High-speed data buffering applications
• Memory mapping systems
• Clock drivers

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status directly with Texas Instruments before procurement. Confirm that the SOIC-24 package dimensions match your PCB footprint requirements. Ensure operating conditions remain within the specified temperature and voltage limits to maintain performance integrity.

Selection Notes

Select this component when an octal configuration with both transceiver and register capabilities is required. The ALS series offers a balance of speed and power consumption suitable for moderate-frequency digital systems. Verify that the 64 ns propagation delay meets the timing constraints of the target application design.

Part Context

This part is part of the SN74ALS family of logic devices produced by Texas Instruments. It serves as a specialized solution for managing eight-bit data paths in digital electronics. The device combines the versatility of a bus transceiver with the storage capability of a register, simplifying circuit designs that require bidirectional data flow control.

Replacement Considerations

Consult official substitution guides for equivalent parts within the same logic family. Verify pinout compatibility and electrical specifications before replacing the original component.