SN74ACT238PWR

Signal Switches, Multiplexers, Decoders Overview

The SN74ACT238PWR is a high-speed silicon gate CMOS decoder manufactured by Texas Instruments. It implements a 3-to-8 decoding function with non-inverted outputs and TTL-compatible inputs. The device operates within a supply voltage range of 4.5V to 5.5V, featuring balanced push-pull outputs capable of continuous ±24mA drive at 5V. Propagation delays are specified with a maximum of 10.9ns from address inputs to outputs. It includes three strobe inputs (G2, G1, G0) for cascading and demultiplexing control.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-compatible CMOS inputs designed for direct interfacing with standard logic devices
• Balanced CMOS push-pull outputs providing equal sourcing and sinking current capabilities
• Three dedicated strobe inputs enabling simplified cascading and data routing functions

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection on shared data buses
• Reducing output requirements for chip select applications
• Data routing and demultiplexing tasks

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package variant, as the SN74ACT238 family includes both TSSOP and WQFN options. Confirm that the ordering suffix matches the required reel quantity and lead finish specifications. Ensure the selected part meets the intended operating temperature range and RoHS compliance requirements for your manufacturing process.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a single-channel 3-to-8 decoder with non-inverted outputs is required. It is suitable for systems needing TTL-compatible input thresholds while maintaining CMOS performance characteristics. Consider the thermal pad connectivity if using the WQFN package, or verify trace length constraints for the TSSOP package to maintain signal integrity.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74ACT series of logic integrated circuits. It provides a specialized decoding function distinct from standard gates or flip-flops within the same product line. The ACT series combines the speed of AC logic with the noise immunity and power consumption characteristics of advanced CMOS technology.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ACT238PW

Signal Switches, Multiplexers, Decoders FAQ

How do the strobe inputs affect the output states?

When any of the three strobe inputs (G2, G1, or G0) is inactive, all outputs are forced into the low state. Only when all strobes are active does the decoder enable the selected output based on the address inputs.

What is the recommended handling for unused inputs?

Unused TTL-compatible CMOS inputs must not be left floating. They should be terminated to either VCC or ground, typically using a pull-up or pull-down resistor, to prevent oscillations and excessive power consumption.