SN74ALS258ANG4

Overview

The SN74ALS258ANG4 is a quad 2-line to 1-line data selector/multiplexer with 3-state outputs manufactured by Texas Instruments. It belongs to the SN74ALS series and operates on a single power supply ranging from 4.5V to 5.5V. The device features four independent multiplexing circuits, each selecting between two data inputs (A or B) based on the A/B select line. The 3-state outputs interface directly with system buses without loading data lines when the output-enable (OE) input is at a high logic level. It is housed in a 16-pin plastic dual-in-line package (PDIP) and is characterized for operation within an operating free-air temperature range of 0°C to 70°C.

Feature Summary

• Provides bus interface capability from multiple sources in high-performance systems through 3-state outputs that do not load data lines when disabled.
• Designed to multiplex signals from 4-bit data sources to 4-output data lines specifically for bus-organized systems.
• Features include direct interface with system buses and independent control of output enable states.

Applications

• Multiplexing signals from 4-bit data sources to 4-output data lines in bus-organized systems
• Providing bus interface from multiple sources in high-performance systems
• Direct interfacing with system buses

Procurement Notes

Verify the specific ordering suffix 'G4' against current manufacturer documentation to confirm lead-free status and RoHS compliance details. Confirm the package type corresponds to the standard plastic DIP (N) variant as indicated by the 'AN' designation. Ensure the component meets the required catalog rating for commercial temperature ranges rather than military specifications associated with the SN54 prefix variants.

Selection Notes

Select this component for applications requiring quad 2-to-1 multiplexing with tri-state outputs in bus-oriented architectures. It is suitable for designs needing direct system bus interfacing where output disabling prevents bus loading. Consider the ALS series characteristics for speed and power consumption balance compared to standard LS or AS families. Verify voltage levels match the 4.5V to 5.5V supply requirement.

Part Context

This part is part of the SN74ALS258 family, which includes similar devices like the SN74ALS257A. While the SN74ALS257A selects data based on the A/B input state, the SN74ALS258A selects based on the inverse state. Both share the same pinout and 3-state output functionality but differ in their internal logic selection truth tables. They are distinct from the SN74AS258, which offers higher drive currents and faster switching speeds.

Replacement Considerations

SN74ALS257AN serves as a functional substitute if inverted selection logic is acceptable. SN74AS258AN provides equivalent functionality with improved performance metrics including higher output current and reduced propagation delay. SN54ALS258AJ is available for military temperature range requirements (-55°C to 125°C).