CD74AC138M

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CD74AC138M is a widely used integrated chip, commonly used in logic circuits, signal switches, multiplexers, and decoders. It is an eight-channel data selector/multiplexer supplied in a variety of packages, which can be used to address and buffer standard logic signals. The CD74AC138M is powered by a +5V supply and is designed to drive up to 15 TTL loads.

The CD74AC138M is comprised of a 3-to-8 decoder and eight data selectors with three-state outputs.The decoder utilizes a high speed Schmitt trigger circuit for improved noise immunity, an active high Enable input, an active low chip Enable input, and an active high Output Enable (OE) input. The eight data selector/multiplexers employ three address inputs (A0, A1 and A2) and an active low Enable input. As with the decoder, the data selector/ multiplexer outputs are three-state.

The CD74AC138M applications feature increased noise immunity, wide operating temperature range, and up to15mil gate delay times. The device operates over a temperature range of -40 °C to +85 °C, making it ideal for a variety of industrial, commercial, and consumer applications. Examples include Motorola\'s S-BUS interface and Hitachi\'s HD44780 LCD controller.

The working principle of the CD74AC138M can be broken down into three elementary operation classes. First, it is important to understand how the three-to-eight decoder works. The decoder has three active high inputs (A0, A1 and A2) and an active high enable input. Accordingly, when the enable is high the address inputs select one of the eight outputs (Y0-Y7).

The second principle category involves the data selectors/ multiplexers. The data selectors have three active high address inputs (A0, A1 and A2) and an active low enable input (EN). When enabled, the address select one of eight data inputs (I0-I7). The data selector/multiplexer then drives a corresponding output (Y0-Y7).

The third principle category involves the three-state outputs. It is the OE (Output Enable) input which controls the state of the CD74AC138M outputs. When the OE is low, the output of the CD74AC138M is high. When the OE is high, the output of the CD74AC138M is in a high impedance state. This allows the source of the data that is being selected to drive the CD74AC138M output.

Understanding the CD74AC138M\'s logic gates and signal switches, multiplexers and decoders is important for there applications. This is necessary in order to select the proper application of the device in order to receive the highest performance. Each application of the device requires that the inputs and outputs be properly connected. For example, when a multiplexer is used as an address selector, the address inputs must be placed on the data selector inputs and the output must be connected to the desired data line.

The CD74AC138M is an invaluable device for a variety of applications. It is an extremely versatile and dependable product that is capable of providing a wide range of features for a multitude of tasks. Its features, such as its high noise immunity, wide temperature range and fast gate delay times make it an ideal choice for various industrial and commercial applications.

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