When EL is LOW, the state of the segment outputs (Oa to. Og) is determined by the data on DA to DD. When EL goes HIGH, the last data. HEFBP datasheet, HEFBP pdf, HEFBP data sheet, datasheet, data sheet, pdf, NXP Semiconductors, BCD to 7-segment latch/decoder/driver. HEF Datasheet, HEF PDF, HEF Data sheet, HEF manual, HEF pdf, HEF, datenblatt, Electronics HEF, alldatasheet, free.

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Subject of this experiment is the realization of a complete digital counter to a figure. In practice, the 7-segment display will show how many times there has been an event, which in this case is the push of a button of the type normally open.

Obviously, the event to be counted may be anything that can be converted into electrical impulse. This counter is, in principle, the basic unit based on the digital clock in the section “projects”. In fact, if we had an oscillator tuned to the frequency of 1 Hz, and we apply this signal to the input of the counter HEFwe achieved a stopwatch or a countdown, depending on how the same is set by means of the presser The circuit is powered by a direct voltage of 5 volts, but could be powered in a voltage range from 5 to 15 volts with the foresight to vary the values of the passive components.

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HEF Datasheet, PDF – Datasheet Search Engine

This means that hf4511 same produces a square wave pulse with the timing of the negative ramp of the positive and determined by the value of the capacitor “C1” and the resistances “R1” and “R2”. The impetus thus obtained present at pin 10 of the IC, is conteggiaggio the counter positive waveHEF The pulses on the pin 15 are counted datashete the value is presented in BCD code on 4 pins: The counting may be increasing or decreasing by setting the pin datashfet Also, to allow a count of number of digits unlimited, on pin 7 is presented a positive signal every 10 in input carry-out.

To realize the circuit on a breadboard is necessary to insert, as usual, the three integrated straddling the two sections upper and lower.

Then make the connections between them directly with clips from insulated copper wire or by means of passive components. Also arranging the display hfe4511 the two sections that connect them datzsheet not, by interposing the resistor voltage drop, corresponding to pins of the IC following the pattern in the datasheet of the same, making sure to connect the output of the IC to the corresponding leg segment A of the display, and so for the other 6. Finally connect at least one of the legs of the cathode to the negative line of the power supply.


Finally connect the outputs positive and negative power supply to the respective lines of the breadboard, then power up. Home English Counter with 7-segment display.

English Menu Home electronic components electronic instruments electronic experiments electronic projects graphic symbols theory. The 4 bits ABCD coming from the meter are applied to the corresponding inputs 7 A 1 B 2 C 6 D of the integrated decoder, which in datahseet ignites the combination of two or more LEDs of the display coherently the figure to be displayed At the side, the schematic of the IC’s pins.