SN74AS253AN

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Logic-Signal Switches, Multiplexers, Decoders provide designers with a device that can modify the data flow in various ways based on the logic structure of their circuits. SN74AS253AN is one of the most widely used logic-signal switches used in a variety of systems. It is a 4-input multiplexer/selector switch with a latch-enable feature that allows designers to sense an incoming data rate of up to five times that of the normal data rate of the system. This application note will discuss the features, application field and working principle of SN74AS253AN.

Features

SN74AS253AN is a 4-input multiplexer/selector switch with latch-enable feature. It has a power supply voltage range of 3.3V to 5.5V and a maximum high frequency switching time of 63 ns. It has an input current of 0.5 mA at 5V, maximum-off leakage current of 2 µA at 5V and a maximum-on supply current of 10.5 mA at 5V. It has an output low voltage of 0.4V at 5V and a maximum-off leakage current of 2 µA at 5V. Additionally, it has on-board bus input buffers and enable latch inputs to increase system performance. It absorbs a maximum of 50 mW of power and operates at temperatures between -40°C to 85°C.

Application Field

SN74AS253AN is used in a variety of systems such as computers, automotive and consumer electronics. In computers it can be used as a replacement for analog multiplexers in applications that require data rate of up to five times that of the normal data rate. In automotive applications, it can be utilized in instrument panel digital displays, multiplexed inputs and NMR sensors. In consumer electronics, SN74AS253AN can be used in environments such as home theater, gaming and home automation.

Working Principle

The working principle of SN74AS253AN is that it utilizes an analog multiplexer (MUX) capable of sensing data rates up to five times that of the normal system data rate. It also has bus input buffers and enable latch inputs to increase system performance. The MUX responds to coded channel address, and if the address matches the address selected by the latches, the data from the corresponding input will be present at the output terminal. This allows for the data rate to effectively be increased from the system’s normal rate, allowing for faster data throughput.

The SN74AS253AN also has a latch-enabling feature that allows for either positive/negative latch enable, depending on the logic of the circuit. Positive latch enable can be enabled by pulsing the LE input high, whereas negative latch enable can be enabled by pulsing the LE input low. This feature allows the MUX to effectively sense incoming data rates of up to five times the normal data rate of the system.

Overall, SN74AS253AN is a logic-signal switch that enables fast data throughput and can provide a performance boost to any system. Its data rate sensing feature makes it one of the most widely used logic-signal switches in a variety of systems. Its latch-enabling feature allows for either positive/negative latch enable, depending on the logic of the circuit, thus allowing it to effectively sense incoming data rates better than its analog multiplexer counterparts.

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