CD4015 Dual 4-stage Static Shift Register

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The CD4015 belongs to the CD4000 IC series. The IC contains two identical, 4-stage, serial input/parallel-output registers with independent “Data”, “Clock,” and “Reset” inputs. The logic level present at the input of each stage is transferred to the output of that stage at each positive-going clock transition. A logic high on the “Reset” input resets all four stages covered by that input. The IC has a wide range of operative conditions and voltages and interfaces directly with CMOS, NMOS, and TTL devices. CD4015 offers various features such as high noise immunity and low thermal dissipation.

What is Static Shift Register?

Static Shift registers are digital memory circuitry found in devices such as calculators, computers, and data processing systems. With a static shift register, data or bits are entered into the system in a serial or parallel manner. data entry is done from one direction, and as more data is added, it shifts positions until the data gets to the output end. The two ends are referred to as the left and right end. Movement of data can be from left to right, from right to left, or in both directions to make a bidirectional register.

CD4015 Key Features

Wide supply voltage range: 3.0V to 18V
High noise immunity: 0.45 VDD (typ.)
Low power TTL: Fan out of 2 driving 74L compatibility: or 1 driving 74LS
Medium speed operation: 8 MHz (typ.) clock rate
Fully static design: @VDD − VSS = 10V

CD4015 Pinout

Pin No	Pin Name	Description
1	CLK B	clock signal of shift register B
2	Q4B	output 4 of shift register B
3	Q3A	output 3 of shift register A
4	Q2A	output 2 of shift register A
5	Q1A	output 1 of shift register A
6	RA	reset value of shift register A
7	DA	data value of shift register A
8	VSS	source supply
9	CLK A	clock signal of shift register B
10	Q4A	output 4 of shift register A
11	Q3B	output 3 of shift register B
12	Q2B	output 2 of shift register B
13	Q1B	output 1 of shift register B
14	RB	reset value of shift register B
15	DB	data value of shift register B
16	VDD	Drain supply