IC 74245 PDF

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To contact the author. As you can note it, the frequencies spread out of 5 Hz with 0, Hzi. The stitching of this circuit is indicated on figure L1 ignites with its full intensity. After the sixteenth clock pulse, the incrementing of the indication of the bill-posters starts, this one being in hexadecimal code, of 00 to finish to FF at the end of counting. It is thus enough to a little attention to observe the phenomenon and if there would remain some points obscure, do not hesitate to start again several times the experiment.

Rock then SW1 on position 0 to validate the circuit again. By observing the LED and the bill-posterscheck the correct operation of the meter by consulting the table of figure Will finally know that the circuit 74LS is a circuit of technology T.

Indeed, L0 still flickers, ordered by the signal coming from CP1 ; on the other hand L1 does not flicker any more. In the preceding practices, you tried out various types of meters ; that that you will examine now is not different from the others as for its design, but it has the great advantage of containing 12 stages in a single integrated circuit. How to make a site? By commenting on the experiment, one can say that each stage of the meter carries out a division by two of the frequency of the signal applied to its entry ; if one injects the signal with 10 Hzcoming from contact CP1at the entry f 1 of the meter, the various exits, one obtains signals whose frequency is each time reduced by half.


Now reverse the direction of transmission by applying the rectangular signal provided by CP1 to the B8 entry. The meter can go from 0 to 2 12 positions.

Observe what occurs on A8. You have just checked the two directions of transmission of the signal between A8 and B8 of the one of the eight ways of the integrated circuit.

IC 74LS245/74245 DIP20

To carry out the following experiments, it will be necessary to use a meter. The door of entry NAND is followed of a trigger of Schmitt who is used to improve 7445 of the signal, then come two reversers which control the chain of dividers. In this first phase, you will check the operation of the one of the eight bidirectional buffers of the integrated circuit. Electronic forum and Infos.

Click here for the following lesson or in the synopsis envisaged to this end. To carry out iv experiments envisaged in this practice, it will be necessary for you to use the following material: Carry out then the connections necessary.

The most significant bit M. This is symbolized by a bubble placed on the entry f1 in figure Operational test of a Meter on 12 floors. It presents a luminosity 7425 than the normal. By basing you on the results obtained, you can build the table of operation of the bidirectional buffer indicated figure 17 which can be summarized schematically by figure It must be in position OFF at the time of its connection on the sector.


High of page Preceding page Following page.

A higher tension could damage it. You can notice the sign represented inside each buffer ; it indicates that the buffers used comprise a circuit of re-arrangement of the trigger type of Schmitt. Indeed, when SW0 is in position 1the passage of the signal in the direction of A8 with B8 is authorized. Adopt the same procedure for the seven other ways in order to check correct operation.

The figure b represents the diagram of the electric circuit carried out. Static page of welcome. At boundaries 2, 3, 4, 5, 6, 7, 8 and 9 can be connected eight lines of A1 to A8and eight others can be connected to pins 18, 17, 16, 15, 14, 13, 12 and 11 of B1 with B8. The table of figure 23 indicates the frequency and the period of the signals of the various stages of the meter and summarizes the test results.

The entry RESET gives the meter to zero, it is asynchronous ; as soon as a level H is applied to him, the meter passes to 0. You thus noted that L1 can be ordered independently of the buffer which, not validated, does not intervene. Forms maths Geometry Physics 1. The meter is incremented each time the entry f1 passes from the high level on the bottom grade, i. The electric diagram of the circuit carried out is represented figure b, while the figure c represents its synoptic diagram.