74165 8 Bit Parallel In Serial Out Shift Register
The 74165 IC is a high-speed 8-bit parallel-in serial-out (PISO) shift register belonging to the 74 series logic family. It enables parallel data loading through its input pins and outputs the data serially, controlled by clock pulses. Featuring asynchronous clear and serial data input, it provides flexible operation for microprocessors, digital systems, and embedded designs.
Packaged in a DIP-16, the 74165 is commonly used in I/O port expansion, digital data transfer, serial communication, and memory interface circuits.
🔹 Applications
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I/O expansion in microcontrollers and microprocessors
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Data storage and transfer in digital circuits
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Serial communication (UART, SPI)
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LED matrix and display control
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Robotics and automation projects
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Educational and DIY electronics
🔹 Precautions
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Maintain supply voltage between 4.75V – 5.25V
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Do not exceed 7V absolute maximum rating
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Use proper clock signal for stable data shifting
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Protect against ESD damage while handling
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Avoid overheating during soldering (<260°C for 10s max)
🔹 Technical Specifications
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IC Type: 8-bit Parallel-In Serial-Out Shift Register
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Logic Family: 74-series TTL
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Package Type: DIP-16
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Number of Bits: 8
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Data Input: Parallel (8) + Serial (1)
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Data Output: Serial
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Control Inputs: Clock, Shift/Load, Clear
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Supply Voltage (Vcc): 4.75V – 5.25V
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Propagation Delay: ~20ns (typical)
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Fan-out: 10 LS-TTL loads
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Operating Temperature Range: 0°C to +70°C
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Pin Count: 16 pins
📹 Tutorial Video
Watch 74165 Shift Register Tutorial
🔹 Related Categories
🔹 Summary
The 74165 8-Bit Parallel-In Serial-Out Shift Register IC (DIP-16) is a reliable solution for I/O expansion, serial data transfer, and memory interfacing. With parallel loading, serial output, and TTL compatibility, it is widely used in embedded systems, display control, robotics, and communication circuits. A must-have for any IC’s collection.
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