Click on picture to enlarge A completed counter. Click on picture to enlarge Positions of jumpers J1, J2 for common cathode 7-segment display. The unused counter has all its inputs grounded it's important that all unused inputs of a CMOS IC should not be left floating. They are usually tied to circuit ground. The following table shows how the outputs change with the input pulses. We therefore need another IC CD to convert the BCD codes to a set of 7 positive signals which individually drives each segment of the display.
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Pin Number. Pin Name. Clock CLK. The counting happens when this clock pulse goes high , this pin is normally connected to timer or other uC to produce a pulse. Clock Inhibit INH. Connected to the Ground low of the circuit, to enable clock pin. Enable Input DEI. Enable Output DEO. This is an output which always stays high, this pin will be only if more than one CD IC is used cascaded.
Divide by 10 CO. This is the carry over output pin; it produces a pulse after counting till 9. This pin will be only if more than one CD IC is used cascaded. These are the decoded output pins which should connected to 7-Segment display.
The ground pin should be connected to ground of circuit. Not 2 out UCS. This is Ungated C segment pin. This is an output pin which will be rarely used when division is required. One single IC can be used to count form zero 0 to nine 9 directly on a Common Cathode type 7-segment display.
The count can be increased by simply giving a high clock pulse; also more than one digit can be created by cascading more than one CD IC. So if you have a 7-segment CC display on which you have to display numbers that are being counted based on some condition then this IC will be a perfect choice.
We have 7 output pins naming from Out A to Out G which is directly connected to the 7-segment display. The 7-segment pins will increment the count by one number each time when the clock pin pin 1 is made high. They simply have to generate a pulse of low voltage 0V and high voltage 5V. In the circuit below I have used a clock source of 1Hz to increment the count. The Reset pin pin 15 is used to reset the count back to zero when made high. There are three other output pins pin 5,4,14 which will be used only when the IC needs to be cascaded.
This small pulse can be used to drive the clock pin of a cascaded IC to display more than one digit. Subscribe to stay updated with industry's latest Electronics components and news. Component Datasheet. CD Datasheet. Tags CD Get Our Weekly Newsletter!
CD4543 Datasheet PDF - Texas Instruments