SN74AHC257BQBR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC257BQBR is a quad 2-input data selector/multiplexer with three-state non-inverting outputs. It operates within a supply voltage range of 2V to 5.5V and supports an operating temperature from -40°C to 125°C. The device features balanced CMOS outputs capable of driving bus-organized systems, with a maximum propagation delay of 9.5ns at 5V. It utilizes a 16-pin WQFN package (BQB) measuring 3.6mm by 2.6mm.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-to-1 multiplexing architecture with shared A/B select and OE control inputs
• Balanced CMOS three-state outputs for high-impedance bus interfacing
• Latch-up performance exceeding 250mA per JESD 17 standard

Signal Switches, Multiplexers, Decoders Applications

• Data selection in digital circuits
• Multiplexing signal paths
• Bus-oriented system interfacing

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the BQB suffix indicates the WQFN-16 package configuration. Confirm the specific revision level matches design requirements. Ensure ESD handling protocols are followed during assembly due to CMOS input sensitivity. Validate thermal pad connection to GND or floating status as per layout guidelines.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for applications requiring low delay and wide voltage operation. The WQFN package suits space-constrained designs. Verify load capacitance does not exceed 50pF to maintain specified timing characteristics. Ensure unused inputs are terminated to prevent oscillation and excessive power consumption.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AHC257 family of logic ICs. It functions as a high-speed CMOS quadruple 2-line-to-1-line data selector/multiplexer. The device is designed for general-purpose digital logic applications requiring reliable data routing and bus management capabilities.

Signal Switches, Multiplexers, Decoders FAQ

How should unused inputs be handled?

Unused inputs must not be left floating. They should be terminated to VCC or ground using a pull-up or pull-down resistor, typically 10kΩ, to prevent undefined operational states and oscillations.

What is the recommended bypass capacitor value?

A 0.1μF capacitor is recommended for each VCC terminal. It should be placed physically close to the device to prevent power disturbances.