Podcast
Questions and Answers
What does the IC-7490 output after receiving 10 clock pulses?
What does the IC-7490 output after receiving 10 clock pulses?
- It outputs a binary number 1001 and resets. (correct)
- It outputs a decimal number 10.
- It outputs a hexadecimal value 0xA.
- It outputs a sequence from 0 to 9 continuously.
Which of the following correctly describes the MOD-5 counter's output sequence in IC-7490?
Which of the following correctly describes the MOD-5 counter's output sequence in IC-7490?
- 0 -> 2 -> 4 -> 6 -> 8 -> 0
- 0 -> 1 -> 2 -> 3 -> 4 -> 0 (correct)
- 0 -> 1 -> 2 -> 3 -> 4 -> 5
- 1 -> 2 -> 3 -> 4 -> 5 -> 0
What role does the external clock signal play in the operation of the MOD-2 and MOD-5 counters in IC-7490?
What role does the external clock signal play in the operation of the MOD-2 and MOD-5 counters in IC-7490?
- It resets the MOD-2 counter after every pulse.
- It is applied to the MOD-2 counter and its output serves as the clock input for the MOD-5 counter. (correct)
- It directly controls the output of the seven segment display.
- It acts solely as the power supply for the ICs.
Which IC is responsible for converting the binary coded decimal (BCD) output from IC-7490 into a format suitable for the seven segment display?
Which IC is responsible for converting the binary coded decimal (BCD) output from IC-7490 into a format suitable for the seven segment display?
What is the most significant bit (MSB) in the output sequence of the MOD-5 counter from IC-7490?
What is the most significant bit (MSB) in the output sequence of the MOD-5 counter from IC-7490?
Flashcards
7490 IC
7490 IC
A 14-pin integrated circuit that acts as a BCD (Binary-Coded Decimal) decade counter.
Decade Counter
Decade Counter
A counter that counts through 10 discrete states before returning to zero.
MOD-2 Counter
MOD-2 Counter
A counter that goes through two states (0 and 1) repeatedly before returning to 0.
MOD-5 Counter
MOD-5 Counter
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BCD Code
BCD Code
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7447 Decoder
7447 Decoder
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Seven-Segment Display
Seven-Segment Display
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External Clock Signal
External Clock Signal
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Study Notes
Aim and Objectives
- Implement a decade counter using IC 7490 and a seven-segment display.
- Understand the functionality of the IC 7490.
IC 7490 Block Diagram
- The IC 7490 is a 14-pin IC.
- It has a MOD-2 and a MOD-5 counter.
- It generates a BCD code corresponding to each clock pulse.
- The outputs QA, QB, QC, and QD are four bits of the BCD code.
- The counter resets after 10 clock pulses.
IC 7490 Pin Diagram
- Input pins for clock CLK and reset pins R1, R2, R3, R4.
- Output pins for QA, QB, QC, QD.
- Pin 4 is Vcc and pin 8 is Ground (GND).
- Pin 3, 5, 6, and 7 are not connected or NC.
Counter Operation
- The external clock signal is applied to the MOD-2 counter.
- The output QA of the MOD-2 counter acts as a clock for the MOD-5 counter.
- The MOD-2 counter has a count sequence of 0 → 1 → 0...
- The MOD-5 counter has a count sequence of 0 → 1 → 2 → 3 → 4 → 0...
- The output sequence for a decade counter is 0 to 9.
Decade Counter Diagram
- The diagram shows the block diagram of the experiment.
- It shows the connection of IC 7490 to the 7447 decoder and 7-segment display.
BCD to 7 Segment Display
- The outputs of the IC 7490 are used to drive the IC 7447 decoder.
- The decoder converts the BCD code to the corresponding 7-segment code.
- The 7-segment code is used to drive a seven-segment display showing the decimal count.
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Description
This quiz explores the fundamentals of the IC 7490 decade counter and its operation with a seven-segment display. Test your understanding of the block diagram, pin configuration, and counting sequences essential for implementing this integrated circuit. Perfect for electronics enthusiasts and students alike.
