SN74AHC238QPWRQ1

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC238QPWRQ1 is an automotive-grade, high-speed silicon gate CMOS decoder manufactured by Texas Instruments. It functions as a three-to-eight line noninverting decoder or demultiplexer. The device operates within a supply voltage range of 2V to 5.5V and supports an operating temperature range from -40°C to +125°C. It features balanced CMOS push-pull outputs and standard CMOS inputs. Key electrical specifications include a maximum propagation delay of 10.5ns at 5V with a 50pF load and latch-up performance exceeding 250mA per JESD 17. The component is housed in a 16-pin TSSOP package.

Signal Switches, Multiplexers, Decoders Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classification levels.
• Provides one-of-eight decoding capability using three address select inputs and three strobe inputs for output gating.
• Features wettable flank technology in available packages to improve side soldering wetting and facilitate automatic optical inspection.

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix to confirm the package type and reel specifications. Ensure the procurement documentation matches the exact part number SN74AHC238QPWRQ1 to guarantee the correct TSSOP-16 configuration. Confirm compliance with AEC-Q100 standards if automotive qualification is required for the design. Review the latest datasheet revision for any updates to mechanical dimensions or recommended operating conditions before finalizing orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring high-speed memory addressing or data routing in automotive environments. The wide supply voltage range allows compatibility with various logic families. Consider the thermal resistance values provided in the datasheet for PCB layout planning. Ensure input signals meet the required transition rates to prevent excessive power consumption or oscillation during operation.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74AHC238-Q1 family of automotive decoders. It is designed for solid-state memory applications where multiple devices must be accessed using limited GPIO pins on a system controller. The decoder activates the chip select input to a selected memory device, allowing read or write operations over a shared bus without interference from other connected devices.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHC238PW

Signal Switches, Multiplexers, Decoders FAQ

How are unused inputs handled?

Unused standard CMOS inputs must not be left floating. They should be terminated at VCC or GND, typically using a pull-up or pull-down resistor, to prevent undefined operational states and excessive power consumption.

What is the function of the strobe inputs?

The device includes three strobe inputs (G2, G1, and G0) to simplify cascading and facilitate demultiplexing. When any input strobe is active, all outputs are forced into the low state.