MC74AC257N

Overview

The MC74AC257N is a quad 2-input multiplexer with 3-state outputs manufactured by onsemi. It selects four bits of data from two sources using a common data select input, presenting the selected data in true form. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature range of -40°C to +85°C. Outputs can be switched to a high impedance state via the Output Enable (OE) input, facilitating direct interface with bus-oriented systems.

Feature Summary

• Quad 2-input multiplexer architecture with noninverting 3-state outputs
• Common data select input controls selection between two data sources for all four channels
• Outputs switch to high impedance state when Output Enable input is logic HIGH
• Pb-free package construction

Applications

• Bus-oriented system interfacing
• Multiplexer expansion by tying outputs together
• Logic implementation of 4-pole, 2-position switches

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and shipping configuration. Confirm RoHS compliance status and availability through authorized distributors. Ensure the component meets environmental requirements for the intended application before procurement.

Selection Notes

Select this component for applications requiring a quad 2-input multiplexer with 3-state outputs. Verify that the supply voltage falls within the 2.0 V to 6.0 V range. Consider propagation delay specifications if timing constraints are critical. Ensure output enable signals are designed to prevent overlap when outputs are tied together.

Part Context

The MC74AC257 belongs to the 74AC logic family, which offers higher speed and wider voltage operation compared to standard 74LS series devices. It is functionally compatible with other 74AC series components, allowing for mixed logic designs. The device provides a compact solution for data routing in digital circuits.

Replacement Considerations

MC74ACT257N: Offers TTL-compatible inputs while maintaining similar functionality and pinout.