SN74LVC258APWR

Overview

The SN74LVC258A is a quadruple 2-line to 1-line inverting data selector or multiplexer with 3-state outputs. It operates within a supply voltage range of 1.1V to 3.6V and features over-voltage tolerant inputs supporting up to 5.5V independent of VCC. The device supports partial-power-down via back drive protection (Ioff). It provides high push-pull output drive strength, reaching ±24mA at 3.3V. Maximum propagation delay is 6.4ns at a 3.3V supply. Latch-up performance exceeds 100mA per JESD78.

Feature Summary

• Contains four independent 2-to-1 digital multiplexers with inverted outputs controlled by shared OE and A/B select lines.
• Features balanced CMOS 3-state outputs capable of driving high, low, or entering a high-impedance state.
• Includes circuitry to disable all outputs when the supply pin is held at 0V for partial power-down applications.

Applications

• Data selection
• Multiplexing

Procurement Notes

Verify the specific package suffix against the datasheet to confirm physical dimensions and thermal characteristics. Ensure input signals transition quickly to prevent oscillations and excessive power consumption. Unused inputs must be terminated to VCC or GND; do not leave them floating during operation.

Selection Notes

Select this component for designs requiring multiple independent 2-to-1 data paths with inverted logic. Verify that the system load capacitance remains within the specified limits to maintain timing specifications. Consider the 5.5V input tolerance if interfacing with higher voltage logic domains while operating at lower supply voltages.

Part Context

This device belongs to the Texas Instruments SN74LVC258A family of logic integrated circuits. It functions as a quadruple multiplexer designed for low-voltage CMOS applications. The component integrates standard CMOS inputs and balanced 3-state outputs suitable for bus-oriented systems.

Replacement Considerations

Check for SN74LVC258AD or SN74LVC258APW variants which share identical electrical specifications but differ in SOIC or TSSOP packaging respectively.

FAQ

How does the device handle partial power-down?

The SN74LVC258A includes Ioff circuitry that disables all outputs when the supply pin is held at 0V, preventing current flow regardless of applied input voltages.

What happens if an input signal transitions slowly?

Slow input transitions can cause oscillations, increased power consumption, and reduced device reliability. Inputs must transition between valid logic states quickly as defined in the recommended operating conditions.