October Revised January General Description. CMOS counters consist of a 4-digit counter, an internal out-. The multiplexing circuit has its own. A HIGH sig-.
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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.
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74C926 Datasheet PDF
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Digital Stop Watch
And also this is a suitable hobby project for newbies. The list of components for this project include;. MM74C consists of a 4-digit counter, an internal output latch, npn output sourcing drivers for common cathode, 7-segment display and an internal multiplexing circuitry with four multiplexing outputs. The counter advances on the negative edge of the clock. The clock is generated by timer IC LM The circuit works off a 5V power supply. It can be easily assembled on a general-purpose PCB.
How does the IC 74926 work?
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.