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8-Bit Parallel In/Serial Out Shift Register IC -74HC165 - SOIC-16 SMD Package

SKU: XIVCM90RUM
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The 74HC165 is a high-speed CMOS 8-bit Parallel-In/Serial-Out (PISO) Shift Register designed to efficiently convert parallel digital inputs into a serial data stream. It is widely used in embedded systems and digital electronics to increase the number of input channels while minimizing the number of microcontroller GPIO pins required. Featuring asynchronous parallel loading and synchronous serial shifting, the 74HC165 enables...
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The 74HC165 is a high-speed CMOS 8-bit Parallel-In/Serial-Out (PISO) Shift Register designed to efficiently convert parallel digital inputs into a serial data stream. It is widely used in embedded systems and digital electronics to increase the number of input channels while minimizing the number of microcontroller GPIO pins required.

Featuring asynchronous parallel loading and synchronous serial shifting, the 74HC165 enables fast and reliable reading of multiple switches, buttons, sensors, or other digital signals. The device operates over a wide supply voltage range of 2V to 6V, making it compatible with both 3.3V and 5V logic systems.

Housed in a compact SOIC-16 Surface Mount (SMD) package, the 74HC165 is ideal for space-constrained PCB designs and automated assembly processes.

Features

  • 8-bit Parallel-In/Serial-Out (PISO) shift register
  • High-speed CMOS logic with low power consumption
  • Wide operating voltage range: 2V to 6V
  • Asynchronous parallel data loading
  • Synchronous serial data shifting
  • Clock Inhibit (CE) function for flexible operation
  • Complementary serial output available
  • Supports cascading of multiple shift registers
  • Compatible with TTL and CMOS logic levels
  • Low standby current for battery-powered applications
  • SOIC-16 SMD package for compact PCB layouts
  • Reliable operation over a wide temperature range

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Specifications

Specifications:

Device Type: 8-Bit Parallel-In/Serial-Out Shift Register
Logic Family: HC CMOS
Number of Bits: 8
Operating Voltage: 2V to 6V
Typical Operating Voltage: 3.3V or 5V
Parallel Inputs: 8
Serial Output: Q7
Serial Input: DS
Parallel Load: Active LOW
Clock Input: Positive Edge Triggered
Clock Inhibit Input: Yes
Propagation Delay: High-speed CMOS performance
Package Type: SOIC-16
Mounting Type: Surface Mount Device (SMD)
Operating Temperature: -40°C to +85°C (typical)

Additional Resources

8-Bit Parallel In/Serial Out Shift Register IC.PDF

FAQ

1. What is the 74HC165 IC used for?

The 74HC165 is an 8-bit Parallel-In/Serial-Out (PISO) shift register designed to convert multiple parallel input signals into a single serial data stream. It is commonly used to expand the number of digital inputs available on microcontrollers such as Arduino, ESP32, Raspberry Pi, and STM32 while minimizing the number of GPIO pins required.

2. How does the 74HC165 work?

The IC captures the logic levels present on its eight parallel input pins when the Parallel Load (PL) pin is activated. Once the data is loaded, clock pulses applied to the Clock (CP) pin shift the stored bits out one at a time through the serial output (Q7). This allows a microcontroller to read eight digital inputs using only a few control pins.

3. What are the key features of the 74HC165?

The 74HC165 offers high-speed CMOS operation, an operating voltage range of 2V to 6V, eight parallel inputs, serial output capability, asynchronous parallel loading, clock inhibit control, and low power consumption. It is supplied in a compact SOIC-16 SMD package suitable for automated PCB assembly.

4. Can multiple 74HC165 ICs be connected together?

Yes. Multiple 74HC165 shift registers can be cascaded by connecting the serial output of one IC to the serial input of the next. This allows designers to monitor 16, 24, 32, or more digital inputs using the same clock and control lines with only one additional serial data connection.

5. What are the common applications of the 74HC165 shift register?

The 74HC165 is widely used in keyboard and keypad scanning, switch and button input expansion, industrial control systems, robotics, embedded systems, digital instrumentation, gaming controllers, automation equipment, and any application requiring efficient digital input expansion.