74HC595 8-Bit Latching Shift Register – 16-Pin DIP

Expand Arduino Outputs with the 74HC595 Shift Register

The 74HC595 is a high-speed, 8-bit serial-in, parallel-out latching shift register in a 16-pin DIP package. Using just three control lines from your microcontroller (such as an Arduino), this IC provides eight additional digital outputs, making it an essential component for projects requiring expanded GPIO capabilities.

Technical Specifications – 74HC595 Shift Register

• Function: 8-bit serial-in, parallel-out latching shift register
• Package: 16-pin Dual In-Line Package (DIP)
• Outputs: Eight parallel 3-state outputs
• Output Enable (OE): Allows all outputs to be placed in high-impedance state, preserving register data
• Daisy-Chaining: Multiple 74HC595 shift registers can be cascaded to provide additional outputs, all controlled via the same three lines
• Typical Applications: LED arrays, bar graphs, digital displays, relay control, and general GPIO expansion
• Alternate Part Number: NTE74HC595

Reliable Output Control and High-Speed Data Management

The 74HC595 shift register features outputs that can be placed in a high-impedance state via the output enable control, allowing for advanced signal management schemes such as multiplexed PWM with precise timing. Data is latched into the output register with every clock pulse, ensuring reliable and glitch-free operation when driving sensitive loads like LEDs or relays.

Usage Instructions

To use the 74HC595, connect the serial data (SER), shift register clock (SRCLK), and storage register clock (RCLK) pins to your controller. Data is shifted in on the rising edge of the clock, and latched to outputs upon strobe. Daisy-chaining requires connecting the Q7' output of one register to the SER input of the next.

For guidance and tutorials, see the official Arduino docs.