The M74HC86B1 from STMicroelectronics is a high-speed CMOS quad exclusive-OR gate fabricated with silicon gate C2MOS technology. It has four independent exclusive-OR gates, each with two inputs and one output. The M74HC86B1 is designed for use in a variety of digital circuits, including arithmetic circuits, data processing units, and code converters.

The M74HC86B1 features high-speed operation, with a typical propagation delay of 10 ns. It also has low power consumption, with a typical supply current of 20 µA per gate. The M74HC86B1 is available in a variety of packages, including the 14-pin DIP, the 14-pin SOIC, and the 14-pin TSSOP.

Features

• High speed operation: 10 ns typical propagation delay
• Low power consumption: 20 µA typical supply current per gate
• Wide operating voltage range: 2 V to 6 V
• High noise immunity: VNIH = VNIL = 28% VCC (min.)
• Standard 14-pin DIP, SOIC, and TSSOP packages

Applications

• Arithmetic circuits
• Data processing units
• Code converters
• Parity generators
• Comparators
• Digital filters
• Oscillators
• Frequency dividers
• Logic circuits

Description

The M74HC86B1 is a quad exclusive-OR gate. An exclusive-OR gate is a digital logic gate that produces a high output (1) only if one of its inputs is high (1) and the other input is low (0). If both inputs are high (1) or both inputs are low (0), the output will be low (0).

The M74HC86B1 has four independent exclusive-OR gates, each with two inputs and one output. The inputs of each gate are labeled A and B, and the output is labeled Y. The output of each gate is calculated using the following equation:

Y = A XOR B

where XOR is the exclusive-OR operator. The exclusive-OR operator is defined as follows:

A XOR B = (A AND NOT B) OR (NOT A AND B)

The M74HC86B1 can be used to implement a variety of digital circuits, including arithmetic circuits, data processing units, and code converters. For example, the M74HC86B1 can be used to implement a half adder, which is a circuit that adds two one-bit numbers and produces a two-bit sum.

The M74HC86B1 is also useful for parity generation and checking. Parity is a technique used to detect errors in data transmission. To generate parity, the M74HC86B1 can be used to calculate the exclusive-OR of all of the bits in a data word. The result is then transmitted along with the data word. When the data word is received, the parity bit can be used to check for errors. If the parity bit does not match the calculated parity bit, then an error has occurred.

The M74HC86B1 is a versatile and powerful logic gate that can be used to implement a variety of digital circuits. It is ideal for use in a wide range of applications, including arithmetic circuits, data processing units, code converters, parity generators, comparators, digital filters, oscillators, frequency dividers, and logic circuits.

Example

The following example shows how to use the M74HC86B1 to implement a half adder:

A    B    Y
--   --   --
0    0    0
0    1    1
1    0    1
1    1    0

The half adder circuit adds two one-bit numbers A and B and produces a two-bit sum Y and carry-out bit C. The carry-out bit is generated when the sum of A and B is greater than or equal to 2.

The following table shows the truth table for the half adder circuit:

A    B    Y    C
--   --   --   --
0    0    0    0
0    1    1    0
1    0    1    0
1    1    0    1

The half adder circuit can be implemented using a single M74HC86B1 chip. The inputs A and B of the first exclusive-OR gate are connected to the two one-bit numbers that are being added. The output Y of the first exclusive-OR gate is connected to the sum bit of the half adder circuit. The output of the second exclusive-OR gate is connected to the carry-out bit of the half adder circuit.