SN74ACT139PWR

Signal Switches, Multiplexers, Decoders Overview

The SN74ACT139PWR is a dual 2-to-4 decoder and demultiplexer from the Texas Instruments ACT logic family. It operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs. The device provides balanced CMOS push-pull outputs capable of continuous ±24mA drive, with short burst support up to ±75mA. Propagation delays are specified at a maximum of 10.2ns for address transitions and 10.4ns for strobe transitions. It is housed in a 16-pin TSSOP package and supports an operating temperature range from -40°C to +125°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent 2-to-4 decoders or demultiplexers with active-low output strobes.
• Features TTL-compatible CMOS inputs designed for direct interfacing with standard logic devices.
• Provides balanced push-pull outputs suitable for driving transmission lines and memory selection.

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection utilizing shared data buses
• Reducing output requirements for chip select applications
• Data routing functions

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details and material specifications. Ensure that the selected variant matches the required thermal performance and moisture sensitivity level for the intended manufacturing process. Cross-reference the part number with the latest datasheet revision history to validate current production status and availability constraints.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when system design requires high-speed decoding with TTL input compatibility. The ACT series offers faster switching speeds compared to standard HC logic while maintaining CMOS power efficiency. Consider the thermal characteristics and output drive capabilities when designing for heavy capacitive loads or high-frequency operation environments.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74ACT series, representing advanced CMOS technology optimized for speed and low power consumption. It serves as a logical evolution in Texas Instruments' logic portfolio, providing enhanced performance metrics over previous generations while maintaining pinout compatibility with legacy designs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ACT139PW

Signal Switches, Multiplexers, Decoders FAQ

How does the device function as a demultiplexer?

The demultiplexing function utilizes the address select inputs to choose the desired output line, while the strobe input acts as the data input. When the strobe is active (LOW), the data appears non-inverted at the selected output.

What are the requirements for unused inputs?

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