Description
4015 IC Dual 4-Bit
Shift Register
(SIPO)
The 4015 IC Dual 4-Bit Shift Register (SIPO) is a professional-grade CMOS digital logic integrated circuit designed to provide two independent 4-bit serial-input/parallel-output shift registers in a single 16-pin package. The device, commonly referenced as CD4015B in industry datasheets, consists of two identical, fully static 4-stage shift registers with independent data, clock, and reset controls per register. During each positive-going clock transition, the input logic at the serial data pins is shifted into successive stages of the register, with each of the four stored bits available at the corresponding parallel output pins.
Features:
Dual independent 4-bit serial-in/parallel-out shift registers with separate Data, Clock, Reset controls.
CMOS digital logic with low power consumption and high noise immunity.
Wide supply voltage range for flexible system design.
Fully static operation enabling indefinite data storage without clocking.
Parallel outputs available from each shift register stage.
Independent reset per register for controlled data clearing.
The CD4015 is a CMOS IC with two 4-bit shift registers. Each shift register has serial input and parallel output pins. It’s commonly used to give you more output pins from a microcontroller, such as Arduino.
You’ll see an example of this further down.
Pin Overview
Pinout for the 4015 IC:
PIN NAME
PIN #
TYPE
DESCRIPTION
VDD
16
Power
Supply Voltage (+3 to +15V)
GND
8
Power
Ground (0V)
D
A
7
Input
Data pin for register A
CLK
A
9
Input
Clock pulse for register A
RST
A
6
Input
Reset pin for register A
Q
A0
,Q
A1
,Q
A2
,Q
A3
5,4,3,10
Output
4-bit output for register A
D
B
15
Input
Data pin for register B
CLK
B
1
Input
Clock pulse for register B
RST
B
14
Input
Reset pin for register B
Q
B0
,Q
B1
,Q
B2
,Q
B3
11,12,13, 2
Output
4-bit output for register B
Pin overview for the 4015 IC
What is a 4-Stage Shift Register?
A shift register is a simple memory circuit that can store a number of bits. You can build one using a series of flip-flops. Each flip-flop can store one bit. A 4-bit shift register like the ones in the CD4015 chip has 4 flip-flops and is often called a
4-stage shift register
:
After the first clock pulse, whatever is on the
Data In
pin will be stored in the first flip-flop. What was on the first flip-flop from before is stored on the second flip-flop. What was one the second flip-flop from before is stored on the third… And so on.
The bit that was stored on the last flip-flop will be overwritten. So on every clock pulse, the data is shifted one flip-flop, or one position, to the right. Hence the name
shift register
.
How To Use The CD4015:
First of all, you need to connect the
VDD pin
to your positive supply terminal and the
GND pin
to your negative supply terminal. You can use a power supply voltage between 3V and 15V. Although, some versions of the 4015 IC support up to 20V. Check your datasheet for exact values.
Each of the two shift registers in the chip has an independent Clock, Reset, and Data pins. Use the clock and data pins to load data into the registers like this: On each rising edge of the
CLK pin
, whatever is on the
D pin
is shifted into the register.
Set the
RST pin
HIGH to reset the four bits of the register back to 0000. Otherwise, keep it LOW.
At any point in time, you can read the state of the shift registers from the
Q
xx
pins
.
Specifications:
Physical
Case/Package
PDIP
Contact Plating
Gold
Mount
Through Hole
Number of Pins
16
Technical
Direction
Unidirectional
Frequency
17 MHz
Input Capacitance
5 pF
Logic Function
Shift Register
Max Operating Temperature
125 °C
Max Supply Voltage
18 V
Min Operating Temperature
-55 °C
Min Supply Voltage
3 V
Number of Bits
4
Number of Bits per Element
4
Number of Circuits
2
Number of Elements
2
Number of Input Lines
1
Number of Output Lines
4
Power Dissipation
500 mW
Propagation Delay
400 ns
Quiescent Current
100 µA
Turn-On Delay Time
400 ns
Applications
Serial-to-parallel data conversion in MCU/MPU systems.
Expansion of digital I/O pins for microcontrollers.
LED and display driver interfacing.
Digital sequencing and temporary data storage.
Logic control and automation circuits.
Datasheet:
CD4015B
Package Include:
1x
4015 IC Dual 4-Bit Shift Register (SIPO)
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