MM74HC595MTCX Integrated Circuits (ICs)

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The MM74HC595MTCX is a high speed serial-to-parallel shift register with two latches, two clock inputs, two data inputs and two data outputs. It is a member of the popular 74HC family of logic integrated circuits from Texas Instruments. The 74HC595MTCX is designed to interface digital systems that require more output ports than the limited I/O lines available on standard microcontrollers. The 74HC595MTCX allows data to be turned into parallel output using two serial data inputs.

Application Field

The 74HC595MTCX is a popular serial-to-parallel shift register for embedded systems due to its low price, wide operating temperature range, and high speed. It is frequently used to expand the number of outputs available from a microcontroller, allowing users to interface additional external devices such as LEDs, relays, motors, and sensors. It is also often used as an addressable latch to store data from multiple sources.

The 74HC595MTCX is commonly used in combination with other logic integrated circuits to provide more complex logic functions. It can also be used to transmit data over long distances. The clock inputs and data inputs can be connected together to chain multiple shift registers together, allowing for a wider parallel data port.

Working Principle

The 74HC595MTCX is a conventional shift register that shifts in data serially on rising clock edges through the data inputs (SI1, SI2) and sends it out in parallel through the outputs (O1-O7). Data is shifted out at the lowest and highest active outputs (O0, O7) and latched in the active low output enable (OE) pins.

Each shift register contains two 8-bit registers: a serial-in-parallel out shift register and a parallel-in-serial-out register. The parallel-in register stores the data and the serial-out register shifts the data out. When the output enable (OE) is low, the serial data is shifted into the parallel register and the outputs are determined by the data stored in the parallel register. When the OE is high, the serial data is shifted out of the parallel register.

To reduce power usage, the 74HC595MTCX also has an active-high master reset (MR) pin which, when driven, clears all register bits. The data stored in the register can be clocked out using the clock (CK1 and CK2) inputs. This can be done manually by pulsing the clock inputs with the desired data output, or automatically using an external clock source. The loading of data is asynchronous, but the unloading of data is synchronous.

Conclusion

The 74HC595MTCX is a fast, low cost, and high temperature shift register suitable for wide variety of applications. It is commonly used in embedded systems to expand output ports or as an addressable latch to store data from multiple sources. It is also used in combination with other logic integrated circuits or to transmit data over long distances. The 74HC595MTCX is easy to implement and requires only low power usage.

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