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| PIN | NAME | FUNCTION | |
| MAX22420/MAX22820 | MAX22421/MAX22821 | ||
| 1 | 1 | VDDA | Power Supply Input for Side A. Bypass VDDA to GNDA with a 0.1μF ceramic capacitor as close as possible to the pin. |
| 2 | — | IN1 | Logic Input 1 on Side A. |
| — | 2 | OUT1 | Logic Output 1 on Side A. |
| 3 | 3 | IN2 | Logic Input 2 on Side A. |
| 4 | 4 | GNDA | Ground Reference for Side A. |
| 5 | 5 | GNDB | Ground Reference for Side B. |
| 6 | 6 | OUT2 | Logic Output 2 on Side B. |
| 7 | — | OUT1 | Logic Output 1 on Side B. |
| — | 7 | IN1 | Logic Input 1 on Side B. |
| 8 | 8 | VDDB | Power Supply Input for Side B. Bypass VDDB to GNDB with a 0.1μF ceramic capacitor as close as possible to the pin. |