XR21B1424_17 Datasheet, PDF (62/64 Pages) Exar Corporation – Enhanced 4-Ch Full-Speed USB UART

XR21B1424
Application Circuits
The GPIO inputs are 5V tolerant. However, when GPIO input voltage levels exceed VIO, an external clamp circuit is
required to prevent VIO from increasing. Two examples of different application circuits are shown in Figure 7.
VIO Clamp Circuits
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Figure 7: VIO Clamp Circuits
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Rev 1C