IC 7490 (BCD Decade Counter)
BD 1.300
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
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. 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
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
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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.
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 internal circuit of IC 7490. It consists of four numbers of Master-Slave JK flip-flops that are internally connected.
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.
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.