DM74ALS157N

Overview

The DM74ALS157N is a quad 1-of-2 line data selector/multiplexer manufactured by onsemi (formerly Fairchild Semiconductor). It utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process. The device features four independent multiplexers that route a 4-bit word from one of two sources to the outputs. It operates within a supply voltage range of 4.5V to 5.5V and supports a free air operating temperature range of 0°C to +70°C.

Feature Summary

• Functionally and pin-for-pin compatible with Schottky and low power Schottky TTL counterparts
• Improved AC performance over standard Schottky and low power Schottky devices
• Includes a separate strobe input for data selection control

Applications

• Multiplexing dual data buses
• Source programmable counters
• Implementing general four functions of two variables where one variable is common

Procurement Notes

Verify the manufacturer origin, as the datasheet indicates Fairchild Semiconductor while the brand is listed as onsemi due to acquisition history. Confirm the package type matches the N16E designation for a 16-Lead Plastic Dual-In-Line Package. Ensure the component meets the specified operating temperature range of 0°C to +70°C for your application environment.

Selection Notes

Select this component when requiring high-speed data selection in TTL-compatible systems. It serves as a direct replacement for older Schottky TTL multiplexers while offering improved AC performance. Consider the ALS158 variant if inverted output logic is required instead of true data presentation.

Part Context

This part belongs to the DM74ALS series of logic integrated circuits. It is functionally related to the DM74ALS158, which provides inverted outputs. Both devices share identical pinouts and switching characteristics, differing only in output polarity to minimize propagation delay times in specific logic configurations.

Replacement Considerations

SN74AS157D