MC74HC245ANG

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Logic - Buffers, Drivers, Receivers, Transceivers are electronics components that can control the flow of electric current or voltage between two or more nodes. MC74HC245ANG is one of these components and it is a High Speed CMOS 8-bit Parallel-in/Serial-out Shift Register. The device is designed to provide a low-voltage, high-speed and low-power shift register with a latched parallel port. It is ideal for digital devices for buffering, storing and transferring data in the form of parallel-to-serial or serial-to-parallel.

The application field of MC74HC245ANG is mainly from Interface to peripheral devices in a digital system, such as serial-to-parallel data conversion for a host computer to interface with microprocessor-based system. It is also used in register data transmission, program montoring, data linking and memory address multiplexing.

The working principle of MC74HC245ANG can be described in 4 steps. Firstly, the parallel data is loaded into the 8 bit latched parallel port. Secondly, the parallel data is loaded into the 8 bit serial shift register, this is triggered by active low parallel-load signal or by placing PS (Parallel load enable) pin LOW. Thirdly, serial data can be shifted out of the output of shift register by using active low shift pulse signal. Lastly, the serial data can be outputted from shift register by using active low output enable signal.

The signal timing diagram for the MC74HC245ANG shift register is shown below. The signal name SH ( Shift Pulse ) starts the data to be shifted in the register. The signal name QH is the serial data output from the register. The signal name PL (Parallel Load Enable) is a signal to parallel input from the latch to shift register. The signal name OE (Output Enable) is used to control the output data from the shift register.

In conclusion, MC74HC245ANG is a convenient and cost-effective component that is suitable in many application fields, such as parallel-serial data conversion, address multiplexing and memory linking. It also has low power consumption, high speed and low voltage features that make it a practical device for many digital systems.

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