MC14071 - Quad 2-Input OR Gate IC

MC14071 IC consists of 4 independent 2-input OR gates. OR gates are used to perform logical addition operations. These are useful in building logic level circuits like Encoder, Decoders, multiplexers, etc. The IC has a wide input voltage range and is used in places where low power dissipation and high noise immunity is desired.

 

Features and Specifications

This section mentions some of the important features and specifications of the OR gate IC.

1. Supply Voltage Range: 3V - 18V DC
2. Power Dissipation: 500mW
3. Input and Output current per pin: +-10mA
4. Temperature Range: −55 to +125 Degree C
5. Capable of Driving two Low power TTL Loads or One Low−power Schottky TTL Load

 

Note: More technical information can be found in the MC14071 Datasheet, linked at the bottom of this page.

 

Pin Configuration

The MC14071 IC has four independent OR gates. The IC consists of 14 pins including I/O and the power pins, the table below can be referred to understand the pin configuration f the OR gate IC.

Pin Number	Pin Type	Pin Description
1	IN1A	Input for OR gate A
2	IN2A	Input for OR gate A
3	OUTA	Output for OR gate A
4	OUTB	Output for OR gate B
5	IN1B	Input for OR gate B
6	IN2B	Input for OR gate B
7	VSS	Ground
8	IN1C	Input for OR gate C
9	IN2C	Input for OR gate C
10	OUTC	Output for OR gate C
11	OUTD	Output for OR gate D
12	IN1D	Input for OR gate D
13	IN2D	Input for OR gate D
14	VDD	Positive Supply Voltage

 

Working and the Boolean logic 

The MC14071 IC has 4 OR logic gates inside. Each gate provides us a logical addition output of two inputs. The logic or the Boolean expression for the given logic OR gate is pretty simple. It is that for logical addition of input signals, it can also be denoted by a (+) sign. The two inputs A and B are logically added, and the result is received at the output pin. The boolean expression of the gate is: A+B=O

The image above explains the internal schematic of the IC. Here, in MC14071 OR gate IC Pin(1, 2, 5, 6, 8, 9, 12, 13) are presented as the input terminals whereas, Pin(3, 4, 10, 11) are the output pins where we obtain the logically added output.

 

Truth table and Proteus Simulation 

The truth table gives us a clearer understanding of the popper functioning of the logic gate. The logic operation of the OR gate is pretty simple. The truth table shown below shows two inputs(A and B) using the logical operation provide a corresponding output.

Input A	Input B	Output
0	0	0
0	1	1
1	0	1
1	1	1

 

A simulation for the OR gate is also given-

 

Alternatives for MC14071 - Quad 2-Input OR Gate IC

74HC32, CD4071, CD4519, CD74HCT32M96

 

Available packages 

SOIC−14, TSSOP−14

 

Applications 

Here are some of the applications of the OR gate IC.

1. Encoders and Decoders
2. Digital Systems
3. Calculators
4. Basic logic circuits

 

2D Model 

Below is the 2D model of the monostable OR gate IC along with its dimensions in millimeters and inches. The following information can be used to create custom footprints and be used while PCB designing and CAD modelling.