SN74AHC257PWR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC257PWR is a quad 2-input data selector/multiplexer with three-state non-inverting outputs, manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 5.5V and features low propagation delay, with a maximum of 9.5ns at VCC = 5V and CL = 50pF. The device includes latch-up performance exceeding 250mA per JESD 17. It is housed in a 16-pin TSSOP (PW) package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-to-1 multiplexing capability with shared A/B select inputs
• Three-state outputs for bus-oriented system interfacing
• Balanced CMOS drive characteristics

Signal Switches, Multiplexers, Decoders Applications

• Data selection
• Multiplexing

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the PW (TSSOP-16) package variant when sourcing. Confirm that the component meets the required operating temperature range of -40°C to 125°C for your application environment. Ensure input signals transition quickly to prevent excessive power consumption or oscillations due to the standard CMOS input structure.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring four independent 2-to-1 data paths controlled by common select lines. The balanced output drive supports both sourcing and sinking currents effectively. Consider the 50pF capacitive load limit to maintain specified switching speeds. Unused inputs must be terminated to VCC or GND to ensure stable operation.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AHC257 family of high-speed CMOS logic devices. It provides multiple channels of data routing within a single integrated circuit. The PW package designation indicates a Thin-Shrink Small-Outline Package (TSSOP) with 16 pins, suitable for surface-mount assembly.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHCT257PW

Signal Switches, Multiplexers, Decoders FAQ

How are unused inputs handled?

Unused inputs must not be left floating; they should be terminated to either VCC or ground to prevent undefined operational states.

What is the function of the OE pin?

The Output Enable (OE) input controls all outputs simultaneously. When OE is high, outputs enter a high-impedance state; when low, outputs are enabled based on the A/B select input.