DM74S257N

Overview

The DM74S257N is a 3-STATE Quad 1-of-2 Data Selector/Multiplexer manufactured by Fairchild Semiconductor. It belongs to the S series of logic integrated circuits and utilizes a 16-pin Plastic Dual-In-Line Package (PDIP) with a 0.300-inch width, conforming to MS-001 standards. The device features four independent selector functions, each providing two data inputs and one output. It operates within a temperature range of 0°C to 70°C and supports a maximum low-level output current of 0.02 A.

Feature Summary

• Provides quad 1-of-2 data selection capabilities for routing digital signals
• Features 3-STATE outputs to facilitate bus-oriented systems
• Incorporates Schottky clamping on inputs to suppress line-ringing

Applications

• High-performance memory decoding systems
• Data transmission systems requiring short propagation delays
• Microprocessor-based data routing applications

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm package integrity and pin alignment against the specified 16-lead PDIP dimensions. Ensure environmental compliance status aligns with project requirements, noting the specific part may not meet current RoHS standards. Validate operating temperature ranges match system constraints before integration.

Selection Notes

Select this component when high-speed data multiplexing is required in TTL-compatible environments. The S series offers superior speed compared to standard LS variants. Consider the DIP-16 package for prototyping or through-hole assembly needs. Verify that the 3-STATE output characteristic meets the specific bus isolation requirements of the target circuit design.

Part Context

This device is part of the Fairchild 74S logic family, designed for high-speed applications. It serves as a specialized data selector within the broader portfolio of digital logic components. The N suffix indicates the specific plastic dual-in-line package configuration, distinguishing it from other mounting options like tape-and-reel variants.

Replacement Considerations

Equivalent parts include the DM74LS257N for lower-speed applications and the DM74ALS257N for advanced low-power requirements. Cross-reference pinouts and electrical characteristics carefully to ensure compatibility with existing board layouts and power supply constraints.