74HC165 Parallel-In Serial-Out Shift Register
8-bit parallel-in, serial-out shift register for reading many buttons or digital inputs through shared latch, clock, and serial data pins. D0-D7 connect to external button/input lines and should not consume MCU GPIO.
Pinout
- VCC
Logic supply; choose 3.3V for direct ESP32/Pico GPIO compatibility or 5V for 5V Arduino logic.
Type · powerVoltage · 3.3 - GND
Ground reference.
Type · ground - PL
Parallel-load latch control from MCU.
Type · digital - CP
Shift clock from MCU.
Type · digital - Q7
Serial data output to MCU input.
Type · digital - CE
Clock enable; may be tied active or controlled by MCU.
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