IC 74245 PDF


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The door of entry NAND is followed of a trigger of Schmitt who is used to improve quality of the 7424, then come two reversers which control the chain of dividers.

IC 74LS245/74245 DIP20

L and that, for this reason, it must be fed with a stable tension of 5 V. The most significant bit M. Form of the perso pages. 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.

To carry out the following experiments, it will be necessary to use a meter. Return to jc synopsis.

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It is about the CDbinary asynchronous meter with 12 bitsi synoptic diagram is represented figure 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.

A higher tension could damage it. Adopt the same procedure for the seven other ways in order to check correct operation. On the twelve exits of Q1 with Q12one finds a number binary of twelve bits active of: Ci must be in position OFF at the time of its connection on the sector. At boundaries 2, 3, 4, 5, 6, 7, 8 and 9 can be connected eight lines of A1 to A8and eight others can be 7445 to pins 18, 17, 16, 15, 14, 13, 12 and 11 of B1 with B8.

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Forms maths Geometry Physics 1.

In this first phase, you will check the operation of the one of the eight bidirectional buffers of the integrated circuit. To carry out the experiments envisaged in this practice, it will be necessary for you to 72445 the following material: 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 742445 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.

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The meter is incremented each time the entry f1 passes from the high level on the bottom grade, i. Electronic forum and Poem. It presents a luminosity weaker than the normal.

Of course, it is not a question to hope the clock pulses up to to check the table: The figure b represents the diagram of the electric circuit carried out. Operational test of a Meter on 12 floors. 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 electric diagram of the circuit carried out is represented figure b, while the figure c represents its synoptic diagram.

L1 ignites with its full intensity. L0 and L1 flicker then at the rate of 10 Hz. To check if the signal goes indeed from B8 towards A8repeat the same procedure as for the preceding case.

Will finally know that the circuit 74LS is a circuit of technology T. The meter can go from 0 to 2 12 positions. This is symbolized by a bubble placed on the entry f1 in figure 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.

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Indeed, when SW0 is in position 1the passage of the signal in the direction of A8 with B8 is authorized. 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.

High of page Preceding page Following page.

Now reverse the direction of transmission by applying the rectangular signal provided by CP1 to the B8 entry. Dynamic page of welcome. Click here for the following lesson or in the synopsis envisaged to this end.

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. Carry out then the connections necessary.

Rock then SW1 on position 0 to validate the circuit again. You have just checked the two directions of transmission of the signal between A8 and B8 of the one of the eight ways of ix integrated circuit.

Datasheet(PDF) – Fairchild Semiconductor

As you can note it, the frequencies spread out of 5 Hz with 0, Hzi. Static page of welcome. This is due to the fact that the exit of door 7425 of figure 15 is at the high level whereas that of door 1 is on the bottom grade thus prohibiting the B8 direction towards A8. By observing the LED and the bill-posterscheck the correct operation of the meter by consulting the table of figure The stitching of this circuit is indicated on figure