This document describes a binary up/down counter using the IC74193 chip. It includes the components needed, a description and pin diagram of the IC74193, simulations of count up and down operations, procedures for testing count up and down using switches and LED outputs, and schematic diagrams and applications of the counter circuit.

1. Gujarat Technological University
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Binary up/down counter using IC74193
DIGITAL ELECTRONICS

2. 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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3. Components
 IC74193
Switches
Connecting Wires
5V battery
LEDs
Resistors
PCB
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4. 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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5. 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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6. Pin Diagram of IC74193
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7. Simulation design(count up)
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8. Simulation design(count down)
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9. 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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10. 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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11. Schematic diagram of count
up operation
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12. Schematic diagram of count down
operation
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13. Application for counter
 Frequency counters
 Digital clock
 Time measurement
 A to D converter
 Frequency divider circuits
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