SN74HCT157DE4

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The SN74HCT157DE4 logic device is designed with two or four independent two-input multiplexers which are used to select several sources and combine it into a single output. It is a high-speed device which allows flexibility, simple solutions and product design at a lower cost. This article will discuss the application field and working principle of SN74HCT157DE4.

SN74HCT157DE4 belongs to the family of logic-signal switches, multiplexers and decoders. It is a Quadruple 2-Input Multiplexers which is an integrated circuit composed of CMOS logic component. This component is suitable to be used in data buses, multiplexing data and address lines, input/output/memory ports, data selector/multiplexer parts, bi-directional buses, 4-16 line decoders, and other applications that require multiplexing or data selection.

The SN74HCT157DE4 provides several advantages such as low-power dissipation, high noise-immunity, and high-speed operation (300mV feedback cap) or 600mV without the cap. It is designed with a TTL logic when Vcc is 5V and its TTL compatible levels when Vcc is 3V. Furthermore, it provides protection against static discharges and inputs pints for ensuring the data retention even at a maximum voltage of 6.5V.

Regarding the working principle, the SN74HCT157DE4 is a device consisting of two or four independent two-input multiplexers that multiplex four data input lines to the common output line - Output Enable (OE). Each multiplexer has two address inputs (A1, A0), two data inputs (D1, D0) and a single common output line. A multiplexer selects one of its two data inputs depending on the value of its address inputs. This device is controlled using four control terminals.

When the OE terminal is enabled, the device allows one of the data inputs lines to be connected to the output line depending on the value of the address inputs. The input signals at the address terminals are decoded to select an enabled low data input. When OE is disabled (logic high), all the outputs will be disabled and the inputs are isolated from the outputs.

In conclusion, the SN74HCT157DE4 is a device classified in the family of Logic- Signal Switches, Multiplexers and Decoders. It is a Quadruple 2-Input Multiplexers which are used in data buses, multiplexing data and address lines, input/output/memory ports, data selector/multiplexer parts, bi-directional buses, 4-16 line decoders, and other applications that require multiplexing or data selection. The SN74HCT157DE4 provides several advantages such as low-power dissipation, high noise-immunity and high-speed operation and it is designed with a TTL logic when Vcc is 5V and its TTL compatible levels when Vcc is 3V.

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