IC 7490 Pin Diagram, Truth Table, Internal Circuit, Application

Here, you will find the IC 7490 Pin diagram, IC 7490 Truth Table, IC 7490 Internal Circuit, and applications. IC 7490 is a decade counter IC that can generate output code in BCD. It is an Asynchronous Decade Counter IC.

IC 7490 can count the binary numbers from 0000 to 1001. After 1001 it gets reset and again starts counting. As the IC 7490 gets reset after counting ten numbers, it is called MOD-10 Decade Counter.

IC 7490 Pin Diagram

Here, you can see the pin diagram of IC 7490. Here the actual IC name is 74LS90.

Pin No. 1: CLKB - There are two clock input pins in IC 7490. It is one of them.

Pin No. 2: R1 - It is the reset pin to reset the circuit to start the counting again.

Pin No. 3: R2 - It is also the reset pin.

Pin No. 4: NC - It is not connected to the circuit.

Pin No. 5: Vcc - It is the positive power supply pin.

Pin No. 6: R3 - It is the Reset Pin.



Pin No. 7: R4 - It is also a Reset Pin.

Pin No. 8: Qc - Output Pin 3

Pin No. 9: Qb - Output Pin 2

Pin No. 10: GND - It is the Negative power supply Pin.

Pin No. 11: Qd - Output Pin 4

Pin No. 12: Qa - Output Pin 1

Pin No. 13: NC - Not connected to the Circuit.

Pin No. 14: Clock input pin 1

IC 7490 Truth Table

Here, you can see the truth table of IC 7490. You can see after counting ten number(0 to 9) it gets reset and start counting again.

IC 7490 Internal Circuit

Here, you can see the internal circuit of IC 7490. It consists of four numbers of Master-Slave JK flip-flops that are internally connected.

Here, you can see the first flip-flop is independent and is driven by the CLKA pin. Another three flip-flops are connected to the CLKB pin.

IC 7490 Applications

1. Mainly, IC 7490 is used in the digital counter circuits.
2. IC 7490 is also used in digital timers and clocks.
3. IC 7490 is used in automatic controller circuits.


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