MM74HC138MTC

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The MM74HC138MTC is a type of logic-signal switch, multiplexer, decoder and it plays a role of non-inverting 3-8 line decoder/demultiplexer with active-low outputs. MM74HC138MTC is designed to be used as an addressable decoder, demultiplexer which is useful in various applications including data bus applications, multiple device selection, memory decoding and address decoding, etc. It consists of an 8-channel stepper motor control decoder and an 8-channel multiplexer connected together. The decoder part of the device converts encoded input (address) signals using two enable pins into a high-impedance 3-8 logic states. The multiplexer part of the device is used to select one of the 3-8 outputs from the decoder and it can be used in combination with a MM74HC139MTC decoder/demultiplexer.

The MM74HC138MTC has the following features: it operates from a single 2.7V to 5.5V power supply, it has a low typical power consumption of 2uA at a 4V supply voltage, it is guaranteed to operate over temperature range between - 40°C and +85°C. It has an output impedance of 5 Ohms, occupied by a maximum line capacitance of 1000pF, a propagation delay of 20ns and an input threshold of 1.5V. It is designed with Schmitt-trigger inputs having hysteresis of 0.5V. The 3-8 output states are guaranteed to be maintained under all specified supply voltage conditions, thereby providing fast, accurate and reliable performance for data bus applications, memory decoding and address decoding.

The applications of MM74HC138MTC can be divided into two categories, firstly its capability as a non-inverting 3-8 line decoder working together with the MM74HC139MTC decoder/demultiplexer. It can be used to address various devices in multiple bus architectures such as 4-bit, 8-bit and 12-bit busses, another application of it is in data bus applications. It can be used as an input buffer, allowing up to eight independent lines of data to be processed.

MM74HC138MTC\'s working principle is based on the concept of decoding logic. It uses two enable pins to decode the encoded address signals into a high-impedance 3-8 logic states. The 3-8 logic states are used by the multiplexer part of the device to select one of the 3-8 outputs from the decoder. The output from the multiplexer is then used to address the associated devices. The MM74HC139MTC decoder/demultiplexer acts as a transceiver, allowing the MM74HC138MTC and the associated devices to communicate.

In conclusion, the MM74HC138MTC is a type of logic-signal switch, multiplexer and decoder, which is useful in various applications including data bus applications, multiple device selection, memory decoding and address decoding. It can be used to address various devices in multiple bus architectures by decoders and multiplexers; and it is designed with Schmitt-trigger inputs having hysteresis of 0.5V. The 3-8 output states are guaranteed to be maintained under all specified supply voltage conditions, thereby providing fast, accurate and reliable performance.

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