4071 IC Quad 2-Input OR Gate

CD4071 Pin Configuration

Pin Number

Pin Name

Description

1,6,10,15

OR Gate Input pin (A)

First Input pin for the OR gate

2,5,11,14

OR Gate Input pin (B)

Second Input pin for the OR gate

3,4,12,13

OR Gate Output pin (Q)

Output pin for the OR gate

7

Ground

Connect to the ground of the circuit.

14

Vcc (Vdd)

Used to power the IC. Typically +5V is used

Features

Dual Input OR Gate Quad Package

Typical Operating Voltage: 5V

Operating Voltage Range: -0.5V to +20V

DC input current: 10mA

Power Dissipation: 500mW

Minimum logic Low voltage @+5V: 1.5V

Minimum Logic High voltage @+5V: 3.5V

Propagation Delay @5V : 250ns (maximum)

Transition Time @5V :200ns (maximum)

Available in 14-pin PDIP, GDIP, PDSO packages

Note:
Complete Technical Details can be found in the
CD4071 datasheet
provided below this article.

Where to use CD4071 IC

The
CD4071
is a
Dual Input OR Gate with a Quad package
. Meaning it has four OR gate IC inside it, each of which can be utilized independently. AND gates are used in building Logic level circuits like Encoder, Decoder multiplexers, etc. Logic-level gates like
CD4071
and flip-flops play a vital role in digital electronics.

If you are looking for an IC to perform logic level OR operation with two inputs, then this IC might be the right choice for you. If you have more than two inputs for your OR gate, then you should look into three-input and four-input OR gates.

Logic OR explanation

The logic OR operation is very simple, since this is a two-input OR gate we will have only two inputs which is A and B respectively. The output of the OR gate is called Q. The
truth table for the OR gate
is shown below.

A

B

Q

0

0

0

1

0

1

0

1

1

1

1

1

How to use CD4071 IC

To use the CD4071 IC, just power it using the Vcc (pin 14) and ground (pin 8) lines. The typical operating voltage of the IC is +5V, but it can also be operated at +5V, +10V, and +15V. The output voltage of the IC on the pin Q will be equal to the operating voltage of the IC. As per the truth table shown above, when either one or both the input of the Gate is high the output will be high. The complete working of the gate with a
sample CD4071 circuit
is shown in the GIF file below.

The input for the gate is controlled by using a switch connected to pin A and B of the Gate. A pull down resistor of 100k is used to hold the logic to low (logic 0) when the switch is left floating. To visualize the output we have connected a LED to the output pin Q. The resistor 680R is used to limit the current through the LED.

Applications

Basic Logic Circuits

Encoders and Decoders

Multiplexers and De-multiplexers

Oscillator circuits

Networking and Digital Systems

4071 IC Datasheet