74HC595 8-Bit Serial to Parallel Shift Register IC

Overview

The 74HC595 is an 8-bit serial-in, parallel-out shift register that includes a storage register (latch) and tri-state outputs. It is the most popular solution for “Pin Multiplexing.” By sending data bit-by-bit into the chip, you can control 8 digital outputs while only occupying 3 pins on your Arduino (Data, Clock, and Latch).

The best part? You can daisy-chain multiple 74HC595 chips together to control 16, 24, or 32 outputs without using any extra pins on your microcontroller!

Key Features

• 8-Bit Parallel Output: Control up to 8 individual components (LEDs, Relays, Transistors) per chip.

• Daisy-Chainable: Connect the “Serial Out” pin of one chip to the “Serial In” of another to expand indefinitely.

• Tri-State Outputs: The outputs can be set to high impedance, which is useful for bus-oriented systems.

• High Speed: Shift frequencies up to 25 MHz, ensuring no visible lag in your displays.

• Breadboard Friendly: Standard DIP-16 package fits perfectly into any breadboard or 16-pin IC socket.

Technical Specifications 

Common Applications 

• 7-Segment Displays: Drive multiple digits using minimal pins.

• LED Cubes & Matrixes: Essential for controlling large grids of LEDs.

• Relay Boards: Activating multiple switches in home automation projects.

• Keyboard Scanning: Reading multiple button presses in a matrix.