74F257ASC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74F257ASC is a quad 2-input multiplexer with 3-STATE outputs, housed in a 16-Lead Small Outline Integrated Circuit (SOIC) package. 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 +4.5V to +5.5V and supports an ambient temperature range of 0°C to +70°C. Propagation delays are specified at 5.5 ns maximum for data inputs and 9.5 ns maximum for the select input under standard conditions.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides non-inverting 3-STATE outputs that can be switched to a high impedance state via a common Output Enable input.
• Enables direct interfacing with bus-oriented systems by allowing multiple devices to share output lines without overlap.
• Includes input clamp diodes designed to limit high-speed termination effects during operation.

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented system data routing
• Multiplexing four bits of data from two distinct sources
• Logic implementation of a 4-pole, 2-position switch

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'SC' corresponds to the SOIC-16 package configuration required for your design. Confirm that the component meets the necessary RoHS compliance standards for your region. Ensure that the active LOW Output Enable logic aligns with your control circuitry. Check for any specific handling requirements related to ESD sensitivity during assembly.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a quad 2-input multiplexer with tri-state capability is required for bus applications. Consider the propagation delay specifications if signal timing is critical. Verify that the operating temperature range of 0°C to +70°C suits your environmental conditions. Ensure the power supply voltage remains within the recommended +4.5V to +5.5V limits for reliable performance.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74F series of logic integrated circuits, characterized by fast switching speeds. The 74F257A variant specifically offers quad multiplexing functionality. The 'ASC' designation indicates the manufacturer, series, and specific SOIC package type. This family is widely used in digital logic designs requiring data selection and bus driving capabilities.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include other 74F257 variants from different manufacturers, provided they maintain the same pinout and electrical characteristics. Ensure any replacement also features 3-STATE outputs and compatible propagation delays. Verify package compatibility if physical footprint constraints exist.

Signal Switches, Multiplexers, Decoders FAQ

How does the Output Enable input affect the multiplexer outputs?

When the Output Enable input is HIGH, the outputs are forced to a high impedance OFF state, effectively disconnecting them from the circuit.

What determines which data source is selected?

The Common Data Select input determines the selection; a LOW level selects inputs I0x, while a HIGH level selects inputs I1x.