This is 74HC595 8-bit shift register breakout module

The 74HC595 contains an 8-bit serial-in, a parallel-out shift register that provides data to an 8-bit D-type memory register.

The 74HC595's memory registers have three-state outputs.

The shift register and the memory register have separate clocks. 74HC595 shift register with the highest priority direct clear side (SRCLR), A serial input (SER), and a serial output for cascading.

When the output enables Is high, the output of the 74HC595 will be in a high-impedance state.

Both the shift register clock (SRCLK) and the store register clock (RCLK) are edge-triggered. If the two clocks are tied together, the shift register will stay one clock pulse ahead of the storage register.

Specifications:

Operating Voltage Range:2-6V

Low Input Current:1.0uA

Output Drive Capability:15 LSTTL Loads

Outputs Directly Interface to CMOS, NMOS, and TTL

Operating Voltage Range:2.0 to 6.0 V

Low Input Current:1.0uA

High Noise Immunity Characteristic of CMOS Devices

In Compliance with the Requirements Defined by JEDEC Standard No.7A

Chip Complexity:328 FETs or 82 Equivalent Gates