gasrami.blogg.se - Parallel to serial converter ic

Following is the small description of these simulations.

Working of IC can be verified from Simulations in Proteus Software. Then after clock transition output will be Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 = 0 a b C D E F G. For example, if before transition of clock, data was Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 = a b C D E F G H. Q0 will be low and data will be shifted towards right by one place. Then after clock transition output will be Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 = 1 a b C D E F G. Q0 will be High and data will be shifted towards right by one place. When any transition of a clock from low to high occurs, Data is shifted one place towards the right and Q0 is filled with AND of two data inputs at A and B.It is also possible to connect two input pins together. Any input pin which is not being used must be set to High. A and B are two input pins and serial data can be fed through any one of the two input pins while using another pin as an active high enables for data entry to other input pins.In order to perform operation ~MR must be set high. So it may be called Reset or clear mode of operation. Until its state is low, no matter what is at input A or B, the output will be in a low state. ~MR is an active low input master reset pin.The Truth Table for working of IC is shown in the figure below.Įquivalent ICs: 74LS165, 74LS166, 74LS170, 74LS295 74LS164 Shift Register Workingįollowing is the working of this particular IC. It internally consists of 8 flip flops, one AND and two Not gates. The logic diagram of the 74LS164 shift register IC is shown in the figure below. GND = This is the ground terminal of power supply.VCC = This is +ve terminal for feeding power supply.Q0 – Q7 : These are output pins and used for providing parallel data of 8 bits as output.Signal at this pin independent of clock, sets all outputs to LOW and clears the register.

~MR : This pin is used to perform the function of master Reset.

CP : This input pin is for a clock signal.

In other words, these are serial data input pins.

A, B : These pins are used to input serial data to IC which needs to be converted into parallel output.

The detailed description of 74LS164 shift register IC pins is given below. As you can see it is a 14 pin IC and it is available in different package formats. The following figure shows the pinout diagram of the 74LS164 IC.