on November 10th 84

How to Use the 74LS86 IC in Digital Circuits?

The 74LS86 IC is a versatile component used in digital circuits for tasks like binary addition, error checking, and signal processing. This article covers its features, applications, and how it operates, along with details on its configuration and design.

Catalog

Overview of 74LS86 IC

The 74LS86 is a versatile integrated circuit featuring four independent 2-input XOR (exclusive OR) gates. XOR gates are commonly used in digital circuits to perform operations where the output is high only if the inputs differ. This IC belongs to the widely used 74XXYY family, designed for straightforward compatibility with other logic devices. It interfaces easily with CMOS, NMOS, and TTL devices, providing a convenient solution for designers working on mixed-signal circuits. Additionally, with TTL-compatible output levels, the 74LS86 integrates seamlessly into projects requiring robust communication with other TTL-based components and microcontrollers. This feature makes it particularly practical for various applications, from digital computing to signal processing.

74LS86 Pin Configuration

74LS86 Pin Details

Pin No	Pin Name	Description
1	1A	INPUT 1 of GATE 1
2	1B	INPUT 2 of GATE 1
3	1Y	OUTPUT of GATE 1
4	2A	INPUT 1 of GATE 2
5	2B	INPUT 2 of GATE 2
6	2Y	OUTPUT of GATE 2
7	GND	Ground pin
8	3Y	OUTPUT of GATE 3
9	3B	INPUT 2 of GATE 3
10	3A	INPUT 1 of GATE 3
11	4Y	OUTPUT of GATE 4
12	4B	INPUT 2 of GATE 4
13	4A	INPUT 1 of GATE 4
14	VCC	Supply Voltage

74LS86 CAD Model

74LS86 Footprint

74LS86 3D Model

74LS86 Specifications

Technical specifications, features, characteristics, and components with comparable specifications of HIT (Hitachi) 74LS86.

Type	Parameter
Package / Case	DIP-14
Series	74LS
Packaging	Tube-packed
Voltage - Supply	4.75V~5.25V
Logic Type	XOR
Number of Circuits/Elements	4
Number of Inputs/Bits per Element	2
RoHS Status	RoHS Compliant

Key Features of 74LS86

High Output Current

The 74LS86 can deliver a maximum output current of 16mA. This feature allows it to handle connections to multiple TTL-compatible devices without needing additional amplification, making it ideal for designs requiring a reliable and steady current flow.

Low Input Current

With a maximum input current of -0.8mA, the 74LS86 ensures minimal power drain from connected components, helping to maintain the efficiency and reliability of your circuit. This low input current makes it a convenient choice for low-power applications.

TTL-Compatible CMOS

The input structure of the 74LS86 is designed to work well with TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) inputs, giving you flexibility when working with different types of logic devices and components.

Wide Operating Voltage

The 74LS86 operates within a voltage range of 4.75V to 5.25V. This range is ideal for projects needing steady performance and compatibility with various power supplies.

High-Speed Performance

With a typical propagation delay of 10-50ns, the 74LS86 provides fast switching speeds. This high-speed operation is useful in circuits where timing and quick responses are required, such as in digital signal processing or computer systems.

Data Rate

The IC can manage data rates up to 35Mbps. This data rate allows the 74LS86 to perform efficiently in applications that involve data transmission and require reliable and quick response times.

Reliable Temperature Range

Operating within a temperature range of 0°C to 70°C, the 74LS86 is suitable for most standard environments, ensuring stability and consistent performance across various conditions.

Push-Pull Output

The 74LS86 features a push-pull output type, which allows it to provide both sourcing and sinking current. This design enhances compatibility with a variety of connected components, helping ensure accurate and stable outputs.

Applications of 74LS86 IC

Binary Addition

The 74LS86 XOR gates are often used in binary addition circuits, such as half-adders and full-adders. The XOR logic is ideal for these circuits since it can output a high signal only when the inputs differ, making it perfect for basic binary addition operations in digital devices.

Network Equipment

In networking, XOR gates play a role in data comparison and error-checking functions. The 74LS86 can be used in devices that verify data integrity, allowing for more reliable data transmission and accurate error detection.

Home Entertainment Systems

The 74LS86 is also used in entertainment systems, particularly for digital processing tasks like encoding and decoding signals. Its XOR gates can simplify complex signal processing, making it useful in applications like televisions, audio systems, and other multimedia devices.

How to Operate 74LS86

The 74LS86 relies on the simple logic of three basic gates. The 7486 is a logical circuit with two AND gates, two NOT gates, and one OR gate. At input pins, the NOT gate is used, and the input is passed to the AND gates without inversion. The output from both AND gates is then fed into the OR gate, producing the final output.

The OR gate only provides a LOW output when both inputs are LOW; here, the NOT and AND gates filter the HIGH states before reaching the OR gates. This simple filtering method creates the XOR gate circuit. Other configurations can be used to create the XOR gate, but each will produce a unique output based on the inputs. A truth table can represent the inputs and results.

Truth Table of 74LS86

INPUTS		OUTPUTS
A	B	OUTPUTS
0	0	0
0	1	1
1	0	1
1	1	0

When either one of the two inputs in a given gate is high, the output of that gate will also be high, as indicated in the truth table. However, if both inputs are either high or low, the output of the XOR gate will be low.

Circuit Design Using 74LS86 Gate IC

In this XOR gate setup, a 1K resistor is used to pull both gate inputs to ground, while each input is connected to power through a button.

Pressing a button raises the corresponding gate input to a high state. Using two buttons allows you to illustrate the EX-OR gate’s truth table. When only one button is pressed, one input is high and the other is low, producing a high output.

Since the chosen chip responds to positive edge triggering, these pull-down resistors are necessary to prevent unintended behavior. The capacitors in this circuit help reduce the button's bounce effect. Although not essential, these capacitors can enhance the gate’s performance for a smoother operation.

Package Dimensions of 74LS86

Manufacturer Information of 74LS86

On Semiconductor, the manufacturer of the 74LS86, focuses on energy-efficient solutions that help reduce global energy consumption. They provide a wide array of power and signal management components, including logic and discrete options tailored for diverse industry needs. Their extensive portfolio is crafted to help engineers solve challenges across fields such as automotive, communications, computing, industrial applications, and more. Known for a strong and reliable supply chain, On Semiconductor supports high-quality standards with responsive customer service, offering a seamless experience from design to deployment. With manufacturing facilities and design centers across North America, Europe, and the Asia Pacific, they maintain a global reach, ensuring timely and efficient service for clients worldwide.