74AC257SJX

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74AC257SJX is a quad 2-input multiplexer with 3-STATE outputs, manufactured by Fairchild Semiconductor. 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 2.0V to 6.0V and supports an operating temperature range of -40°C to +85°C. Propagation delays are specified as 1.5ns to 9.0ns at 3.3V and 1.0ns to 7.0ns at 5.0V, depending on load conditions.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features noninverting 3-STATE outputs that can be switched to a high impedance state via a common Output Enable input.
• Supports multiplexer expansion by allowing outputs to be tied together for bus-oriented system interfacing.
• Provides output source/sink current capability of 24 mA.

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented systems requiring direct interface capabilities
• Multiplexer expansion applications involving tied outputs
• Digital logic implementation of 4-pole, 2-position switches

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering code suffix against manufacturer documentation to confirm package type and tape/reel availability. Confirm RoHS compliance status and lead-free material composition through official datasheets or component databases before procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring quad 2-input multiplexing with 3-STATE output control. Ensure the design accommodates the 2.0V to 6.0V supply voltage range and verify that output enable signals prevent overlap when multiple devices share a bus.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the AC/ACT257 family of quad 2-input multiplexers. The 'SJ' suffix indicates a 16-Lead Small Outline Package (SOP) conforming to EIAJ TYPE II standards with a 5.3mm width. The device is functionally equivalent to other variants in the series but differs in physical packaging.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the 74AC257SC (SOIC), 74AC257MTC (TSSOP), and 74AC257PC (PDIP). These parts share identical electrical characteristics and pinouts but utilize different package geometries.

Signal Switches, Multiplexers, Decoders FAQ

How does the Output Enable input affect the device operation?

Placing a logic HIGH on the common Output Enable (OE) input forces all outputs to a high impedance state, isolating them from the circuit.

What is the function of the Common Data Select input?

The Common Data Select input determines which of the two data sources (I0x or I1x) is routed to the outputs for all four channels simultaneously.