Shift Register CD4015BE

• CD4015 Dual 4-Stage Shift Register
• The CD4015 has two 4-bit Serial In – Parallel Out Shift Register. Meaning, it can receive (input) get data serially and control 4 output pins in parallel. This comes in very handy when we do not have enough GPIO pins on our MCU/MPU to control the required number of outputs. It is often used in projects where relatively a large number of LED’s has to be controlled through the Microcontroller. It can also be used to interface LCD screen since they can acts as the data bit for the LCD displays. Since the IC has two such Shift Registers in one package it can be used independently to control two outputs in parallel. Commonly used to drive two LCD in 4-bit Mode or control 7-Segment display. So if you are looking for a way to expand the I/O capability of your MCU then this IC might be the right choice for you.
• Using the CD4015 IC is very similar to using the popular 74HC595 shift register. It requires only 3 pins connected to the MCU, which are Clock, Data and Reset. It has a wide operating voltage from 2V to 18V. The CD4015 IC will have two Shift Registers (A and B) in a single package, for understanding purpose lets only consider the Register A as shown above. The pins 1, 15 and 4 are connected to the GPIO pins of the Microcontroller. In which pin 1 is the clock which sends a constant pulse to keep timing. The pin 15 is Data which actually sends the Data about which output pins has to stay low and which should go high. The Pin 14 is the Reset which updates the received the data to the output pins when made low, this pin can also be permanently held low.

Applications

• Expand the GPIO pin on a MCU/MPU
• LED Matrix/Cube Projects
• Interface LCD
• Cascading applications
• High logic level controller