DM74ALS257N

Overview

The DM74ALS257N is a 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer manufactured by onsemi. It operates within a supply voltage range of 4.5V to 5.5V and supports a free air operating temperature from 0°C to +70°C. The device features four independent multiplexers with true data outputs, utilizing an advanced oxide-isolated, ion-implanted Schottky TTL process. Key electrical characteristics include a HIGH Level Input Voltage minimum of 2V and a LOW Level Input Voltage maximum of 0.8V. Output drive capabilities provide a HIGH Level Output Current of -2.6mA and a LOW Level Output Current of 24mA.

Feature Summary

• Contains four independent 1-of-2-line data selectors/multiplexers with 3-STATE outputs for direct bus interfacing.
• Presents true data to outputs, functionally compatible with Schottky and Low Power Schottky TTL counterparts.
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process for improved AC performance.
• Switching specifications are guaranteed over the full temperature and VCC range.

Applications

• Bus-organized systems requiring data selection.
• Multiplexing dual data buses.
• Source programmable counters.

Procurement Notes

Verify the package type matches the specific suffix 'N' for the 16-Lead Plastic Dual-In-Line Package (PDIP). Confirm that the application environment remains within the recommended operating free air temperature range of 0°C to +70°C. Ensure supply voltage stays between 4.5V and 5.5V to maintain specified switching characteristics. Check for RoHS compliance status if required by project specifications.

Selection Notes

Select this component when true data output is required for quad multiplexing applications. It serves as a functional replacement for standard Schottky or Low Power Schottky TTL devices where pin compatibility is necessary. Consider the 3-STATE output capability for implementing n-bit paralleled data selectors on shared buses. Verify that the PDIP package fits the available board space constraints.

Part Context

This part belongs to the DM74ALS series of logic integrated circuits. It is related to the DM74ALS258, which provides inverted data outputs instead of true data. Both devices share identical pinouts and switching characteristics but differ in output polarity. The series utilizes Schottky TTL technology to balance speed and power consumption.

Replacement Considerations

SN74ALS257BN