SN74HC251DG4

Logic - Signal Switches, Multiplexers, Decoders are essential components for electronic circuits. Among them, SN74HC251DG4 is an integrated logic gate from Texas Instruments that has been developed for multiplexing applications. It is composed of four buffered 2-input data selectors/multiplexers, a two-input OR gate, two mutually exclusive 4-input OR gates and a buffered data-out output amplifier.

The SN74HC251DG4 offers 2-bit address inputs A0, A1 and four independent data inputs D0, D1, D2, D3. Three control inputs S0, S1, S2 are used to select which of the data inputs will pass through to the data output pins. In addition, the SN74HC251DG4 also features an active LOW enable input and an active LOW output enable input which allows either the data output pins or the control inputs to be disabled.

Application Field

The SN74HC251DG4 has wide application field due to its high-speed operation and low-power consumption. It is mainly used for electronic transmission systems, bus transceivers, multiplexers, switching circuits, and of course, logic circuits. It is also used for data routing and control applications, including multiplexers, demultiplexers, multiplex switching matrices and memory access control circuits. The SN74HC251DG4, being able to support multiple data protocols and having low-power, is commonly used in embedded systems, especially in telecommunications, computer networks and industrial controllers.

Working Principle

The SN74HC251DG4 operates in a three-stage process. In the first stage, the 2-bit address input (A0, A1) and the external control signal input (S0, S1, S2) are combined together, producing 4-bit control signals for selection. In the second stage, the control signals will control the transistors in the SN74HC251DG4 to select two of the four data input pins (D0, D1, D2, D3) and pass them to the data output pins. In the third stage, the data output pins will be combined together with the buffered signal output. Thus, SN74HC251DG4 is able to multiplex and select data according to the control signals.

In conclusion, the SN74HC251DG4 is a highly robust and reliable device and offers high performance, low power and excellent thermal stability. It is designed to be used in many applications such as data transmission, bus transceivers, multiplexers, switching circuits, logic circuits, and more. Its low-power feature, high-speed switching ability and wide application field make the SN74HC251DG4 a versatile device in the electronics industry.