TC74HC165

series introduction

# Introduction to the TC74HC165 Product Series

## Overview
The TC74HC165 is a highly versatile and widely used integrated circuit (IC) belonging to the 74HC family. This product series is designed to provide an efficient solution for parallel - to - serial data conversion, making it an essential component in a variety of digital systems. The "HC" in its name stands for High - Speed CMOS, which indicates that it combines the high - speed performance of TTL (Transistor - Transistor Logic) with the low power consumption and high noise immunity of CMOS (Complementary Metal - Oxide - Semiconductor) technology.

## Key Features

### 1. Parallel - to - Serial Conversion
The primary function of the TC74HC165 is to convert parallel data into a serial stream. It has an 8 - bit parallel input port, allowing it to accept eight individual data bits simultaneously. These parallel data bits can then be shifted out serially one by one, which is extremely useful in applications where data needs to be transmitted over a single communication line, such as in serial communication interfaces or when interfacing with devices that can only handle serial data.

### 2. High - Speed Operation
Thanks to its HC technology, the TC74HC165 offers high - speed operation. It can achieve fast data transfer rates, enabling it to keep up with the demands of modern digital systems. This high - speed performance makes it suitable for applications that require real - time data processing, such as high - speed data acquisition systems and fast - paced communication protocols.

### 3. Low Power Consumption
CMOS technology is known for its low power consumption characteristics, and the TC74HC165 is no exception. It consumes significantly less power compared to traditional TTL - based devices. This low power consumption is beneficial in battery - powered applications, as it helps to extend the battery life. It also reduces the overall power requirements of the system, leading to cost savings and less heat generation.

### 4. High Noise Immunity
The TC74HC165 has excellent noise immunity, which means it can operate reliably in noisy electrical environments. It is less susceptible to electrical interference and noise spikes, ensuring the integrity of the data being processed. This makes it suitable for use in industrial applications, where electrical noise is often present due to the operation of heavy machinery and other equipment.

### 5. Wide Operating Voltage Range
The TC74HC165 can operate over a relatively wide voltage range, typically from 2V to 6V. This flexibility allows it to be used in a variety of systems with different power supply requirements. It can be easily integrated into existing circuits without the need for complex voltage regulation circuits.

## Pin Configuration and Functionality

### 1. Pinout
The TC74HC165 typically comes in a 16 - pin package. The pins are divided into different groups based on their functions:
- **Parallel Input Pins (P0 - P7)**: These eight pins are used to input the parallel data. Each pin represents one bit of the 8 - bit data word.
- **Serial Output Pin (Q7)**: This pin is used to output the serial data. As the parallel data is shifted out, the bits are sent out one by one through this pin.
- **Shift/Load Pin (SH/LD)**: This pin controls the operation mode of the device. When SH/LD is low, the parallel data is loaded into the internal shift register. When SH/LD is high, the data in the shift register is shifted out serially.
- **Clock Pin (CLK)**: The clock signal is applied to this pin. The rising edge of the clock signal is used to shift the data in the shift register.
- **Clock In

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Datasheets

• PDF 1
• PDF 2

Partlist