74HC164 8-bit serial-in parallel-out shift register
74HC165 8-bit parallel-in serial-out shift register
74HC595 8-bit latching serial-in parallel-out shift register

74HC164

The 74HC164 is an 8-bit serial-in parallel-out shift register. Set input pin A, clock the CLK pin, and the input bit will shift into the output pin array starting from Q_A.

Notes

Inputs A and B are AND-gated, so both must be high in order for input to be high. You’ll normally just want to hardwire B high.
~CLR acts as a reset pin, bringing it low will set all outputs low.
Clocking occurs on the low-to-high transition of CLK.
Data shifts into parallel outputs in alphabet order, starting from Q_A.
Chain multiple chips together by linking Q_F of the first chip to A of the next, and connecting all sets of V_CC, GND, ~CLR, and CLK pins.

Pinout

Pin	Label	Description
1	`A`	Gated serial input 1
2	`B`	Gated serial input 2
3	`Q_A`	Parallel output
4	`Q_B`	Parallel output
5	`Q_C`	Parallel output
6	`Q_D`	Parallel output
7	`GND`	Ground
8	`CLK`	Clock
9	`~CLR`	Clear (active low)
10	`Q_E`	Parallel output
11	`Q_F`	Parallel output
12	`Q_G`	Parallel output
13	`Q_H`	Parallel output
14	`V_CC`	Power

Characteristics

Characteristic	Value
Max. input current	1μA
Max. operating current	80μA
Max. output pin drive current	4mA
Input voltage	2V to 6V

74HC165

The 74HC165 is an 8-bit parallel-in serial-out shift register. Set input pins A through H and pull SH/~LD low to load data into the chip. To read this data, pull SH/~LD high and clock the CLK pin eight times, reading each bit from Q_H in reverse alphabet order.

Notes

Clocking occurs on the low-to-high transition of CLK while SH/~LD is high and CLK INH is low.
Data shifts into serial outputs in reverse alphabet order, starting from H.
Chain multiple chips together by linking Q_H of the first chip to SER of the next, and connecting all sets of V_CC, GND, and CLK pins.

Pinout

Pin	Label	Description
1	`SH`/`~LD`	Shift or load data
2	`CLK`	Clock
3	`E`	Parallel input
4	`F`	Parallel input
5	`G`	Parallel input
6	`H`	Parallel input
7	`~Q_H`	Serial output (complimentary)
8	`GND`	Ground
9	`Q_H`	Serial output
10	`SER`	Serial input
11	`A`	Parallel input
12	`B`	Parallel input
13	`C`	Parallel input
14	`D`	Parallel input
15	`CLK INH`	Clock inhibit
16	`V_CC`	Power

Characteristics

Characteristic	Value
Max. input current	1μA
Max. operating current	80μA
Max. output pin drive current	4mA
Input voltage	2V to 6V

74HC595

The 74HC595 is an 8-bit latching serial-in parallel-out shift register. Set input pin SER and clock the SRCLK pin eight times to load data into the shift register, and then clock the RCLK pin to latch the shift register data into the storage register.

Notes

Clocking occurs on the low-to-high transistion of SRCLK and RCLK.
When the ~OE pin is low, the parallel output pins temporarily enter a high-impedance disabled state.
Pulling the ~SRCLR pin low will clear the shift register.
Clocking the SRCLK pin will shift data from SER into the shift register in alphabet order, starting from Q_A.
Clocking the RCLK pin will copy shift register data into the storage register.
Chain multiple chips together by linking Q_H' of the first chip to SER of the next, and connecting all sets of V_CC, GND, SRCLK, ~SRCLR, RCLK, and ~OE pins.

Pinout

Pin	Label	Description
1	`Q_B`	Storage register parallel output
2	`Q_C`	Storage register parallel output
3	`Q_D`	Storage register parallel output
4	`Q_E`	Storage register parallel output
5	`Q_F`	Storage register parallel output
6	`Q_G`	Storage register parallel output
7	`Q_H`	Storage register parallel output
8	`GND`	Ground
9	`Q_H'`	Shift register serial output
10	`~SRCLR`	Shift register clear (active low)
11	`SRCLK`	Shift register clock
12	`RCLK`	Storage register clock
13	`~OE`	Output enable (active low)
14	`SER`	Shift register serial input
15	`Q_A`	Storage register parallel output
16	`V_CC`	Power

Characteristics

Characteristic	Value
Max. input current	1μA
Max. operating current	80μA
Max. output pin drive current	4mA
Input voltage	2V to 6V

Header pins


Pitch	2.54mm
Height (total)	11.54mm
Height (base)	3mm
Height (pin)	6mm
Pin thickness	0.64mm

PCB


Thickness	1.6mm

SOIC-8

Length | 4.90mm

Body width | 3.90mm

Width (incl. legs) | 6.00mm