MC74ACT157N

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The signal switch is a fundamental building block of integrated circuits (ICs) used in a variety of electronic applications. The MC74ACT157N is a four-input signal multiplexer/demultiplexer. It is a member of the advanced CMOS (ACMOS) logic series, which offers extremely high speed and very low power consumption. The MC74ACT157N features higher speed and improved noise margins over the standard 74ACT logic series. Its four data inputs, A, B, C, and D, and four control inputs, E1, E2, E3, and E4, are synchronized with two enable inputs, EN1 and EN2.

The MC74ACT157N is available in two distinct packages: a 16-pin Ceramic Dual In-Line Package (CDIP) and a 16-pin Plastic Dual-In-Line Package (PDIP). It operates in two operating modes (Mode 0 and Mode 1) depending on whether EN1 is asserted or not. In Mode 0, all four data inputs (A through D) are available on the four output pins. In Mode 1, only two data inputs are available, with the remaining two outputs carrying a high logic level. The MC74ACT157N can be cascaded to multiplex or demultiplex any number of data inputs, up to 16 data inputs. The output data is stored in the internal latch and is available on the output pins regardless of the inputs.

The MC74ACT157N is designed to route data signals between devices quickly. It has a propagation delay time of 2.5 nanoseconds (ns) in Mode 0 and 4ns in Mode 1, making it faster than the standard 74ACT logic series. The input thresholds and the noise immunity of the MC74ACT157N are significantly improved, so it can accept slower signals from noisy environments. The MC74ACT157N also supports edge-triggered and level-sensitive logic, making it especially suitable for synchronous applications.

The MC74ACT157N is also capable of reducing power consumption. Due to its high impedance state when the enable inputs are inactive, it draws only a fraction of the power of an equivalent non-CMOS circuit. This feature makes the device ideal for applications that require low power consumption, such as battery-powered systems. The device has a maximum supply voltage of 4.5 volts and a minimum of 3.0 volts, with a maximum output current of 10 mA.

The MC74ACT157N is a versatile, high-speed, low-power signal switch that is ideal for a variety of applications, including switching between multiple data inputs, data transmission and routing, and data conversion. It is used in memory cards, telecommunications systems, automotive electronics, video and audio applications, and other systems that require fast, low-power switching. The device is also suitable for synchronous logic applications and shows excellent noise immunity and tolerance in noisy environments.

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