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ADuM3220/ADuM3221
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
V DD1 1
V IA 2
V IB 3
GND 1 4
ADuM3220/
ADuM3221
TOP VIEW
(Not to Scale)
8
7
6
5
V DD2
V OA
V OB
GND 2
Figure 4. Pin Configuration
Table 10. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
V DD1
V IA
V IB
GND 1
GND 2
V OB
V OA
V DD2
Description
Supply Voltage for Isolator Side 1, 3.0 V to 5.5 V.
Logic Input A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Output A.
Supply Voltage for Isolator Side 2, 4.5 V to 18 V.
Table 11. Truth Table, ADuM3220 (Positive Logic) 1
V IA Input
L
L
H
H
X
V IB Input
L
H
L
H
X
V DD1 State
Powered
Powered
Powered
Powered
Unpowered
V DD2 State
Powered
Powered
Powered
Powered
Powered
V OA Output
L
L
H
L
L
V OB Output
L
H
L
L
L
Notes
Outputs return to the input state within 1 μs of
V DD1 power restoration.
X
X
Powered
Unpowered
L
L
Outputs return to the input state within 1 μs of
V DD2 power restoration.
1
X = don’t care, L = low, H = high.
Table 12. Truth Table, ADuM3221 (Positive Logic) 1
V IA Input
L
L
H
H
X
V IB Input
L
H
L
H
X
V DD1 State
Powered
Powered
Powered
Powered
Unpowered
V DD2 State
Powered
Powered
Powered
Powered
Powered
V OA Output
L
L
H
H
L
V OB Output
L
H
L
H
L
Notes
Outputs return to the input state within 1 μs of
V DD1 power restoration.
X
X
Powered
Unpowered
L
L
Outputs return to the input state within 1 μs of
V DD2 power restoration.
1
X = don’t care, L = low, H = high.
Rev. C | Page 8 of 16
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