![]() So the first data output is ‘1000’Įndmodule 74HC595 IC SIPO Shift Register Circuit & Its WorkingĪ 74HC595 IC is an 8-bit serial in parallel out shift register, so it uses inputs serially and provides parallel outputs. If we apply the first clock pulse ‘1’ to the first flip flop, the data to be entered into the FF and QA becomes ‘1’, and remaining all the outputs like QB, QC and QD will become zero. Let’s take a 4-bit data input example like 1101. Initially, all the output will become zero so without CLK pulse all the data will become zero. Here, QA, QB, QC, and QD are data outputs. The second flip flops output ‘QB’ is connected to the third flip flops input DC, and the third flip flops output ‘QC’ is connected to the fourth flip flops input ‘DD. In the diagram, the first flip flop output ‘QA’ is connected to the second flip flop input ‘DB’. The construction of the SIPO shift register is shown above. ![]() The operation of this shift register is, first all the flip flops from the circuit from FF1 to FF4 have to RESET so that all the outputs of FFs like QA to QD will be at logic zero level so there is no parallel data output. The 4-bit SIPO shift register circuit is shown below. The working of the SIPO shift register is that it takes the serial data input from the first flip flop of the left side and generates a parallel data output. SIPO Shift Register Diagram Working of SIPO Shift Register
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