74HC164N Shift Register IC – 8-Bit Serial-In Parallel-Out (SIPO) for LED, Display & I/O Expansion

The 74HC164N is an 8‑bit serial‑in, parallel‑out shift register IC. Ideal for expanding output pins on microcontrollers like Arduino and ESP32, it allows simple LED control, display driving, and digital signal sequencing.

Description

Function: 8-bit serial-in, parallel-out shift register (SIPO)
Inputs: Two serial inputs (A & B), CLK (Clock), CLR (Clear)
Outputs: Q0 to Q7 (8 parallel outputs)
Logic Type: Non-latching (outputs change immediately with clock signal)
Supply Voltage: 2V to 6V (typically 5V)
Operating Speed: Up to 25 MHz at 5V
Output Drive: ±8 mA (at 4.5V–5.5V)
Asynchronous Clear: Active-LOW CLR resets all outputs to LOW
Package: 14-pin DIP (through-hole, 74HC164N) and SOIC options
Applications: LED matrix driving, segment display control, microcontroller I/O expansion
Compatibility: Arduino, STM32, ESP32, Raspberry Pi, other 3.3V/5V logic systems