MM74HCT138N

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Logic - Signal Switches, Multiplexers, Decoders - MM74HCT138N application field and working principle

The MM74HCT138N is a logic device specifically designed for use as a 3 to 8 line decoder/demultiplexer. It is a CMOS device manufactured by the Nippon FET company.

The device is designed to accept a three bit binary input and provide the user with a two to four line output, corresponding to the state of the input. The output is the recirculated state of the decoder output control lines. The maximum voltage at the output levels is serviceable up to 4.5V.

The device can be used as a multiplexer, which allows the signal to be sent over a single line. The signal is sent a signal multiple times over one line, allowing multiple receivers to receive the signal. This is known as an \'asynchronous serial data bus\', and is commonly used in electronics, telecom, automotive and embedded systems.

The device also has an active low enable input which allows the user to control when the multiplexing process will occur. The enable input is necessary for the device to operate in this mode, and can be used to synchronize the signal being sent and received over the data bus.

The device operates with a supply voltage of 1.65 V to 5.5V, and the operating temperature range of -5C to +125C. The output waveforms of the device in this operating range are standard logic outputs, where logic 0 is between 0 V to 0.8V and logic 1 is between 2.2V to 5.5V. The device also offers logic high and low output current of 2.6mA and 0.25A respectively.

The device is especially useful where low propagation delays and low power dissipation are required. It is also useful in applications where high speed, low noise and logic level conversion are needed due to its high input impedance.

The MM74HCT138N is typically used in a wide range of consumer, automotive and industrial applications, including communications systems, industrial controllers, motor controllers, timer/clock ICs, computer CPUs, and others. The device is also used for data conversion, analog signal conditioning and memory address decoding.

The working principle of the MM74HCT138N is relatively simple. The device takes an input signal, usually from a logic family such as TTL, HTL, HC, etc. It converts this signal into a digital format, which is then used to select the appropriate output channel. The channel selection is performed by decoding the address lines, which is then used to select the appropriate output channel. There are eight outputs, which are activated depending on the binary address stored in the input.

The device has three input signals, including two bin address lines and one enable line. When the enable line is activated, the bin address lines are used to decode the address. The decoded address then selects the appropriate output channel. The output from the decoder is then amplified and sent to the next stage of the application.

In summary, the MM74HCT138N is a 3-8 line decoder/demultiplexer. It is designed for use in a wide range of consumer, automotive and industrial applications, including communications systems, industrial controllers, motor controllers, timer/clock ICs, computer CPUs, and others. It operates with a supply voltage of 1.65 V to 5.5V, and the operating temperature range of -5C to +125C. The output waveforms of the device in this operating range are standard logic outputs, where logic 0 is between 0 V to 0.8V and logic 1 is between 2.2V to 5.5V. The device can be used as a multiplexer, allowing the signal to be sent multiple times over one line. It is especially useful where low propagation delays and low power dissipation are required.

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