Gujarat Technological University

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Binary up/down counter using IC74193

DIGITAL ELECTRONICS

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Outline

Components IC74193 up/down counter description Pin diagram of IC74193 Simulation Design(count up operation) Simulation Design(count down operation) Procedure Schematic diagram of count-down operation Schematic diagram of count-up operation Application

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Components

IC74193SwitchesConnecting Wires5V batteryLEDsResistorsPCB

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IC-74193 up/down counter Description

The IC74193 is synchronous 4 bit binary Up/Down counter .

The IC74193 has 2 control inputs Count up and count Down.

A high to low transition at one of this pins, when the other is held high, determine the direction of count i.e., if count Down is held high and count up is pulsed, the IC74193 functions as an up counter.

The counter can be loaded[preset] with any 4 bit binary code; the desired data is entered at the 4 inputs A,B,C,D while the load pin is held low.

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This feature is very useful when counter is being used as a modulo-N-divider.

This is achieved by loading different values of count length into the IC74193 and counting down to zero.

A overloading clear input is provided Which when taken high forces all the outputs to low levels.

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Pin Diagram of IC74193

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Simulation design(count up)

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Simulation design(count down)

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Procedure

1. Locate the IC74193 on the kit .

2. Make connection as in fig.

3. Take CLR input to 1 and then return it to 0 levels .This clears the counter.

4. Take count down and load inputs to logic ‘1’.

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5. Apply pulse to the count up input by means of manual pulser switch.

6. Monitor the QA to QD outputs on the logic output indicators . Note that QD is the MSB and QA is LSB.

7. Verify the count up operation by forming the table of the output sequences.

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Schematic diagram of count up operation

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Schematic diagram of count down operation

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Application for counter

Frequency counters Digital clock Time measurement A to D converter Frequency divider circuits

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