SN74ALS857DWR

Overview

The SN74ALS857DWR is a hex 2-to-1 universal multiplexer manufactured by Texas Instruments, featuring three-state outputs for bus-oriented applications. It operates within a supply voltage range of 4.5 V to 5.5 V and is housed in a 24-pin SOIC package. The device supports high-speed data routing with propagation delays typically ranging from 10 ns to 20 ns depending on load conditions. Designed for low power consumption, it draws a maximum quiescent current of 19 mA at 5 V. The component functions as an identity comparator or data selector, enabling efficient signal management in digital logic systems.

Feature Summary

• Provides six independent 2-to-1 multiplexing channels with three-state output control
• Supports universal data selection with active-low enable functionality for bus isolation
• Delivers high-speed switching performance suitable for synchronous digital circuits
• Compatible with standard TTL logic levels while maintaining low power dissipation

Applications

• Bus-oriented memory address decoding and data routing
• High-speed data selector circuits in microprocessor systems
• Signal multiplexing for test and measurement equipment
• Digital logic interface modules requiring isolated data paths

Procurement Notes

Verify the complete part number including the 'DWR' suffix to ensure correct SOIC-24 packaging and reel quantity specifications. Confirm RoHS compliance status through official Texas Instruments documentation prior to integration. Cross-reference datasheet revision dates to validate electrical characteristics against current design requirements. Ensure ESD handling procedures are followed during storage and assembly processes.

Selection Notes

Select this component when multiple independent 2-to-1 data paths with tri-state capability are required in a compact footprint. Consider the ALS series speed-power trade-offs compared to standard 74LS or advanced HC/HCT families. Evaluate board space constraints against the 24-pin SOIC package dimensions. Verify input voltage compatibility with existing logic levels in the target system architecture.

Part Context

This multiplexer belongs to Texas Instruments' SN74ALS logic family, known for improved speed over standard LS devices with reduced power consumption. The SN74ALS857 provides versatile data routing capabilities essential for complex digital designs. Its three-state outputs facilitate direct connection to shared buses without external buffering components.

Replacement Considerations

Direct substitutes include SN74ALS857N (PDIP package) or SN74ALS857NSR for alternative mounting styles. Check equivalent offerings from other manufacturers such as ON Semiconductor or NXP that match the ALS specification and pinout configuration.