SN74HC157NG4

The SN74HC157NG4 is a 1-of-4 data selector/multiplexer/decoder with active low enable and active low outputs. It is a TTL logic device with dual supply voltage, making it an excellent choice for high-performance logic applications. The SN74HC157NG4 is a 4-bit multiplexer (selector) with four input lines, four outputs, and a single enable input. The enable input is used to control the selection of the data to the outputs. When the enable input goes high, the inputs are connected to the output lines by the selection logic.

The digital logic responsible for selecting the data is based on a two-level multiplexer. This digital logic is able to select from up to four specific digital signal inputs, and then multiplex them to an output. This type of circuitry is very useful for signal switching, and for expanding the number of digital inputs that can be connected to a single output line. The SN74HC157NG4 can also be used for decoding, whereby digital signals are used to produce a corresponding set of digital outputs.

The SN74HC157NG4 is used mainly in the applications of logic and data multiplexing, signal switches, multiplexers, and decoders. For example, it is used to reduce the number of control lines used in memory array applications, and as a building block for multiplexers and decoders employed in computer-based systems. In addition, it can be used to expand the number of digital waveforms that can be sent to a single output line, as well as for signal switching.

The SN74HC157NG4 is manufactured as an integrated circuit (IC) according to the Complementary Metal-Oxide Semiconductor (CMOS) technology. It is available in a 14-pin plastic dual-in-line package (PDIP ), as well as in a 14-pin plastic small-outline package (SOIC).

The working principle of the SN74HC157NG4 is simple. When its enable pin is low, all of the outputs of the device are high regardless of the settings of the input pins. When the enable pin is high, the decoder chooses one of the four inputs according to the binary settings of the select pins. The selected input is connected to the appropriate output in accordance with the logic table of the device.

The SN74HC157NG4 is an ideal device for systems that require high-speed logic and data multiplexing, signal switching, multiplexers, and decoders. It is fast and reliable, can be used for a wide range of applications, and is relatively inexpensive. It is a versatile and powerful logic device that is well-suited for a variety of applications.