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 SpecificationsÂ
| Feature | Specification |
| Logic Family | 74HC (High-Speed CMOS) |
| Operating Voltage | 2V to 6V DC (Ideal for 3.3V and 5V systems) |
| Package Type | DIP-16 (Through-Hole) |
| Output Current | ±6mA per pin (up to 35mA total) |
| Propagation Delay | 13ns (at 5V) |
| Operating Temp | -55°C to +125°C |
Common ApplicationsÂ
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.
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