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Onsemi MC74HC165ADR2G Environmental and export classification status description

The MC74HC165 is an 8-bit serial-in parallel-out shift register. It can take 8 bits of data in serially and output them in parallel. It is designed for high-speed operation and offers a wide range of applications in digital systems. Functions - Serial Data Input: The chip allows for 8 bits of serial data to be fed into the register. - Parallel Data Output: After shifting in the serial data, the output pins can provide the 8 bits in parallel. - Shift Register Operation: It includes a clock input that regulates the operation of shifting the data into the register. - Output Control: It has control pins that manage the shifting and clocking of data into the register. Applications - Data Acquisition Systems: Used when digital data needs to be collected in a systematic manner. - Microcontroller Interface: Allows microcontrollers to interface with multiple digital inputs or outputs efficiently. - LED Control: Can be used to control multiple LEDs from a microcontroller with fewer I/O pins. - Sensor Data Reading: Reading multiple sensor inputs through a single serial line. - Expansion of Digital Inputs/Outputs: Used in applications requiring expansion of limited pins on microcontrollers or FPGA. Alternative Parts - 74HC595: This is another common 8-bit shift register with similar functionality but includes a latching output. - SN74HC165: A direct variant with similar functionality, equally popular in applications needing parallel output. - 74LS165: This is the low-power version of the 74HC165 but operates at lower speeds. - 74HCT165: Similar function to the 74HC165 but designed for TTL compatibility. Embedded Modules - Shift register modules that integrate the MC74HC165 can often be found in hobbyist kits. - Some development boards may integrate this IC for demonstration purposes in interfacing applications. - Modules that convert GPIO pins into multiple I/O controls using shift registers typically use this IC. Related Q&A 1. What is the maximum clock frequency for the MC74HC165? - The maximum clock frequency for the MC74HC165 typically depends on the supply voltage but is generally around 25 MHz when powered under standard conditions. 2. How do you connect multiple MC74HC165s in a daisy chain configuration? - To connect multiple MC74HC165s, you can connect the QH’ (serial out) pin of the first register to the SER (serial input) pin of the next register, ensuring all clock and control pins are shared among them. 3. What is the difference between the MC74HC165 and the 74HC595? - The MC74HC165 is a serial-in parallel-out shift register, whereas the 74HC595 is a serial-in serial-out shift register with additional latch functionality for holding the last output state. 4. Can the MC74HC165 be used with microcontrollers like Arduino? - Yes, the MC74HC165 can be easily interfaced with microcontrollers, including Arduino, to expand the number of digital input pins available. 5. What considerations should be taken when using MC74HC165 in a high-speed application? - Ensure proper signal integrity, maintain short trace lengths, and provide adequate decoupling capacitors near the IC to reduce noise and improve performance in high-speed applications.