// ICs & Logic

74HC165

The 74HC165 is an 8-bit parallel-in, serial-out shift register used to expand microcontroller input pins. With just 2–3 signal lines, you can read 8 (or more, daisy-chained) digital inputs.

// Specifications

Supply Voltage

2V – 6V

Input Count

8 parallel

Interface

Serial out (SPI compatible)

Package

DIP-16

Logic Family

HCMOS

Clock

Up to 100 MHz

// Pin Reference Table

Pin	Name	Function	Type
1	SH/LD	Shift or load select	I/O
2	CLK	Clock input	BUS
3	E	Parallel input E	I/O
4	F	Parallel input F	I/O
5	G	Parallel input G	I/O
6	H	Parallel input H	I/O
7	QH_bar	Complementary serial output	I/O
8	GND	Ground	GND
9	QH	Serial output	BUS
10	SER	Serial input for daisy-chain	BUS
11	A	Parallel input A	I/O
12	B	Parallel input B	I/O
13	C	Parallel input C	I/O
14	D	Parallel input D	I/O
15	CLK_INH	Clock inhibit, hold HIGH to stop	I/O
16	VCC	Supply voltage	PWR