IC 7490 Decade Counter Basics

What does the IC-7490 output after receiving 10 clock pulses?

Which of the following correctly describes the MOD-5 counter's output sequence 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?

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?

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.

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.