Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
V DD1 1
V IA 2
V IB 3
GND 1 4
ADuM1280/
ADuM1285
TOP VIEW
(Not to Scale)
8
7
6
5
V DD2
V OA
V OB
GND 2
Figure 4. ADuM1280 / ADuM1285 Pin Configuration
Table 29. ADuM1280 / ADuM1285 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 (2.7 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA,
WB, and WC grades).
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 (2.7 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA,
WB, and WC grades).
V DD1 1
V OA 2
V IB 3
GND 1 4
ADuM1281/
ADuM1286
TOP VIEW
(Not to Scale)
8
7
6
5
V DD2
V IA
V OB
GND 2
Figure 5. ADuM1281 / ADuM1286 Pin Configuration
Table 30. ADuM1281 / ADuM1286 Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
V DD1
V OA
V IB
GND 1
GND 2
V OB
V IA
V DD2
Description
Supply Voltage for Isolator Side 1 (2.7 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA,
WB, and WC grades).
Logic Output A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Input A.
Supply Voltage for Isolator Side 2 (2.7 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA,
WB, and WC grades).
For specific layout guidelines, refer to the AN-1109 Application Note, Recommendations for Control of Radiated Emissions with i Coupler
Devices .
Rev. B | Page 13 of 20
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