Texas Instruments 74HC251 Data Selector/Multiplexer IC, DIP-16

The Texas Instruments 74HC251 Data Selector/Multiplexer IC is an advanced logic component featuring 3-state outputs for direct bus interfacing. This integrated circuit provides full binary decoding to select one-of-eight data sources, making it a cornerstone for data routing and signal management in digital systems. Its strobe-controlled complementary outputs enable efficient parallel-to-serial conversion, delivering both true and inverted data for enhanced design flexibility.

A primary feature is its high-current 3-state output stage, which allows the IC to interface seamlessly with system data buses or drive up to 15 Low-power Schottky (LSTTL) loads. When disabled, outputs enter a high-impedance state, preventing bus contention and allowing multiple devices to share a common line. The single enabled output then drives the bus line to a definitive high or low logic level with low impedance. Outputs are collectively controlled by the Output Enable (OE̅) input, becoming disabled when OE̅ is held high.

Engineered for performance and efficiency, this IC boasts a typical propagation delay of just 9 nanoseconds, supporting high-speed data switching. It operates with a maximum low power consumption of 80µA and features a very low maximum input current of 1µA, minimising its overall power draw. With an output drive capability of ±6mA at 5V, it ensures robust signal integrity across connected components.

Specifications & Applications

• Logic Family: 74HC
• Function: 8:1 Data Selector/Multiplexer
• Package: 16-pin Dual In-line Package (DIP)
• Wide Supply Voltage: Operates from 2V to 6V
• Broad Temperature Range: Suitable for operation from -40°C to +85°C

This versatile component is ideally suited for demanding applications in industrial control systems, communications infrastructure, and networking hardware, where reliable data selection and bus management are non