SN74AHC238BQBR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC238BQBR is a high-speed silicon gate CMOS decoder manufactured by Texas Instruments. It implements a single 3-to-8 line noninverting decoding function within a 16-pin WQFN package. The device operates across a supply voltage range of 2V to 5.5V and supports an operating temperature from -40°C to +125°C. Propagation delay reaches a maximum of 10.5ns at 5V with a 50pF load. It features balanced push-pull outputs, standard CMOS inputs, and three strobe inputs for output enable control.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides one-of-eight decoding functionality using three address select inputs
• Includes three strobe inputs to simplify cascading and facilitate demultiplexing operations
• Features balanced CMOS push-pull outputs capable of sourcing and sinking similar currents

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data in solid state memory systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific BQB suffix indicates the WQFN package configuration. Confirm the active production status matches current design requirements. Ensure input signals transition quickly to prevent oscillations. Terminate unused inputs to VCC or GND to maintain valid logic states during operation.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a high-speed 3-to-8 decoder is required for memory addressing or data routing. The wide supply voltage range accommodates various system power rails. The low propagation delay supports high-frequency digital interfaces. Verify that the WQFN package fits the available PCB footprint constraints.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74AHC238 family of decoders. It serves as a core logic element for managing multiple peripheral devices on a shared bus. The device replaces older logic families by offering faster switching speeds and lower power consumption while maintaining compatible pinouts for many legacy designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHC238PW (TSSOP package variant)

Signal Switches, Multiplexers, Decoders FAQ

How do the strobe inputs affect the decoder outputs?

When any of the three strobe inputs (G2, G1, or G0) are active, all outputs are forced into the low state. When not disabled, only the selected output goes high based on the address inputs.

What happens if CMOS inputs are left floating?

Floating standard CMOS inputs can cause excessive power consumption and oscillations. Unused inputs must be terminated at VCC or GND to ensure stable operation.