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 input lines; multiple devices can be daisy-chained to read large input arrays using only 3 MCU GPIO pins.
Logic supply; choose 3.3V for direct ESP32/Pico GPIO compatibility or 5V for 5V MCU logic.
Ground reference.
Parallel-load latch control from MCU.
Shift clock from MCU.
Serial data output to MCU input.
Clock enable; may be tied active or controlled by MCU.
Parallel input pins from downstream buttons or logic signals; not MCU GPIO.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VCC | power | Logic supply; choose 3.3V for direct ESP32/Pico GPIO compatibility or 5V for 5V MCU logic. | 3.3V | |
| GND | ground | Ground reference. | ||
| PL | digital | Parallel-load latch control from MCU. | ||
| CP | digital | Shift clock from MCU. | ||
| Q7 | digital | Serial data output to MCU input. | ||
| CE | digital | Clock enable; may be tied active or controlled by MCU. | ||
| D0-D7 | data | Parallel input pins from downstream buttons or logic signals; not MCU GPIO. |
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