SN74S32D

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The SN74S32D is a quad two-input OR gates, a standard logic component found in many digital electronic circuits. Four independent two-input OR gates are included in the SN74S32D, each gate having two active-low inputs and one active-high output. This low-power Schottky device is designed with low noise and low power output for a wide range of applications. It offers a high-speed operation of 10 ns maximum and an output current of 4 mA.

Applications

The SN74S32D is suitable for a wide range of digital applications. Commonly used in logic-level conversions, noise control and high-speed switching operations, it can also be employed to build complex logic functions and combine multiple inputs into a single output. More specifically, this device can be used in more typical applications such as OR logic combining, analog multiplexers, 3-state data selection, sequential logic and memory decoding.

Working Principle

The SN74S32D is an OR gate with four independent channels. When one or both of the inputs are LOW (0 or 0.8 V), the output is HIGH (3 to 5.5 V). When both inputs are at HIGH (3 to 5.5 V), the output is LOW (0 or 0.8 V). It is important to note that this gate takes the output from all four of its inputs to decide its output. As the OR gate takes all the inputs, a “1” output will be returned when any of the inputs is “1”.

Let’s use an example to illustrate this working principle. Suppose you have three inputs A, B and C, and the SN74S32D OR gate is connected as shown below.

If A and B are “0”, and C is “1”, then the output of the gate will be “1” as shown in the diagram. To summarize, the final output of the SN74S32D OR gate will be HIGH if any of the inputs is HIGH and will be LOW if all inputs are LOW.

The SN74S32D device is commonly used in logic level conversions, noise control, and high-speed switching operations, particularly in applications such as OR logic combining and circuit testing. This device is especially useful for combination circuits and functions as it features a fast switching speed and an output current of 4 mA. Because of its low power output, low noise, and high-speed operation, the SN74S32D is extremely popular as a basic logic component and can be found in many digital electronic circuits.

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