DM74LS257BN

Overview

The DM74LS257BN is a Schottky-clamped high-performance multiplexer featuring 3-STATE outputs, designed for direct interface with bus-oriented systems. It contains four independent 2-input selectors within a single 16-pin Plastic Dual-In-Line (PDIP) package. The device operates on a single supply voltage ranging from 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. Key electrical characteristics include a typical average propagation delay of 12 ns from data input, a typical power dissipation of 50 mW, and output drive capabilities of -2.6 mA at HIGH level and 24 mA at LOW level.

Feature Summary

• Features 3-STATE outputs that allow direct interfacing with data lines in bus-organized systems by enabling high impedance states.

Applications

• Bus interface applications requiring connection from multiple sources in high-performance systems
• Implementation of n-bit paralleled data selectors for data buses

Procurement Notes

Verify the specific manufacturer origin, as this component was originally produced by Fairchild Semiconductor and later acquired by onsemi. Confirm the package designation matches the N16E standard for 16-Lead Plastic Dual-In-Line. Ensure the ordering code suffix aligns with required packaging formats, such as tape and reel options if applicable.

Selection Notes

Select this component when designing systems requiring quad 2-input data selection with tri-state output control. It is suitable for applications needing low impedance driving of bus lines while minimizing contention through optimized output disable timing relative to enable times.

Part Context

This part belongs to the 74LS series of logic integrated circuits, specifically functioning as a 3-STATE Quad 2-Data Selector/Multiplexer. It shares pinouts with LS157 and LS158 variants but provides true output polarity. The device utilizes Schottky clamping to enhance AC performance compared to standard TTL logic families.

Replacement Considerations

SN74LS257BN