SN74ALS257ANG4

Overview

The SN74ALS257ANG4 is a quad 2-input data selector/multiplexer from the Texas Instruments ALS logic family. It multiplexes signals from four 4-bit data sources to four output lines in bus-organized systems. The device features three-state outputs that do not load data lines when the output-enable (OE) input is high. It operates within a supply voltage range of 4.5 V to 5.5 V and an operating temperature range of 0°C to 70°C. Propagation delays are specified at 12 ns maximum for A/B inputs and 18 ns maximum for OE transitions.

Feature Summary

• Provides bus interface capabilities from multiple sources in high-performance systems
• Features three-state outputs that isolate data lines when disabled
• Designed for direct interfacing with system buses

Applications

• Multiplexing signals from 4-bit data sources to 4-output data lines
• Bus-organized system signal routing
• High-performance system bus interface design

Procurement Notes

Verify the G4 suffix indicates RoHS compliance and lead-free manufacturing status per the manufacturer's packaging addendum. Confirm the package type corresponds to the standard plastic DIP (N) variant. Ensure the ordering part number matches the specific revision and material specifications required for your application environment.

Selection Notes

Select this component for applications requiring low power consumption and moderate speed typical of the ALS series. It serves as a direct replacement for older S-series devices where lower power is prioritized over the higher drive current of AS-series alternatives. Verify that the 0°C to 70°C commercial temperature range meets the operational requirements.

Part Context

This device belongs to the SN74ALS257A family, which includes complementary demultiplexer variants like the SN74ALS258A. The ALS series offers a balance between the speed of the S-series and the power efficiency of the LS-series. The SN74ALS257ANG4 specifically denotes the commercial grade version in a plastic DIP package.

Replacement Considerations

SN74ALS257AN is the non-RoHS equivalent in the same package. SN74AS257 provides faster switching speeds but higher power consumption. SN74LVC257APWRG4 is a low-voltage CMOS alternative requiring different supply voltages.