Description
CD4070 – An IC with Four XOR Gates
The CD4070 is a CMOS chip with four XOR gates. Because each gate has two inputs and it has four gates inside, it’s usually called a
Quad 2-Input XOR Gate
.
XOR means
exclusive OR
, and will only give a HIGH output if one of the inputs is HIGH and the other is LOW. Or to say it in another way:
The output from an XOR gate will be HIGH only if the inputs are not equal.
Pin Overview
Pin Name
Pin #
Type
Description
VDD
14
Power
Supply Voltage (+3 to +15V)
GND
7
Power
Ground (0V)
A1 to A4
1, 5, 8, 12
Input
Inputs A of the four XOR gates
B1 to B4
2, 6, 9, 13
Input
Inputs B of the four XOR gates
Q1 to Q4
3, 4, 10, 11
Output
Outputs from the four XOR gates
Pin overview for the 4070 IC
What is an XOR gate?
XOR gate symbol
The XOR gate outputs HIGH if its two inputs are not equal. So if one of the inputs (both not both!) is HIGH, the output will be HIGH. It’s one of the basic logic gates.
Input A
Input B
Output Y
0
0
0
0
1
1
1
0
1
1
1
0
XOR Gate Truth Table
How To Use the CD4070?
Like with all ICs in the 4000 series, you need a power supply voltage of 3 to 15V. Some versions of the chip support up to 20V. Check the datasheet of your version of the chip for exact values.
To be able to use any of the XOR gates in the chip, you need to first connect the
VDD pin
to the positive supply terminal and the
GND pin
to the negative supply terminal.
The A and B pins
are the inputs to the four XOR gates in the IC.
The Q pins
are the outputs from the XOR gates.
Technical Specifications
Physical
Case/Package
PDIP
Contact Plating
Gold
Mount
Through Hole
Number of Pins
14
Technical
Ambient Temperature Range High
125 °C
High Level Output Current
-4.2 mA
Input Capacitance
5 pF
Logic Function
XOR
Low Level Output Current
4.2 mA
Max Junction Temperature (Tj)
150 °C
Max Operating Temperature
125 °C
Max Output Current
6.8 mA
Max Supply Voltage
18 V
Min Operating Temperature
-55 °C
Min Supply Voltage
3 V
Number of Bits
4
Number of Channels
4
Number of Circuits
4
Number of Elements
4
Number of Gates
4
Number of Input Lines
2
Number of Inputs
2
Number of Output Lines
1
Number of Outputs
1
Output Current
6.8 mA
Propagation Delay
100 ns
Quiescent Current
5 µA
Schmitt Trigger Input
No
Termination
Through Hole
Turn-On Delay Time
100 ns
4070 Datasheet
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