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


Here, you will find IC 7490 Pin diagram, IC 7490 Truth Table, IC 7490 Internal Circuit and applications. IC 7490 is a decade counter IC which 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.

IC 7490 Pin Diagram, pin diagram of IC 7490


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 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

Read Also: BCD to Seven Segment Display Decoder Circuit using IC 7447

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 Truth Table, Truth Table of IC 7490



Read Also: IC 7400 Pin Diagram, Circuit design, Datasheet, Application


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.

IC 7490 Internal Circuit


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 also used in digital timers and clocks.
3. IC 7490 is used in automatic controller circuits.


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IC 7490 Pin Diagram, Truth Table, Internal Circuit, Application IC 7490 Pin Diagram, Truth Table, Internal Circuit, Application Reviewed by Author on 19:19 Rating: 5
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