Table 5-26 Nonpower I/O Pad Voltage and Current Characteristics
over operating free-air temperature (unless otherwise noted) (1)(2)(3)
||I/O pad voltage limits if voltage protected
||VDD + 0.3
||Positive I/O leakage for VDD ≤ VIN ≤VIO(4)
||Negative I/O leakage for VIO MIN ≤ VIN ≤ 0V (4)
||Maximum positive injection if not voltage protected(5)
||Maximum negative injection if not voltage protected(5)
(1) To avoid potential damage to the part, externally limit either the voltage or current on I/Os other than power and WAKE as listed in this table.
For the external reference inputs of the ADC, avoid a current-limiting resistor (see the IVREF
specification in Table 5-33
(3) I/O pads should be protected if at any point the I/O voltage has a possibility of going outside the limits shown in the table. If the part is unpowered, the I/O pad voltage and current must be limited (as shown in this table) to avoid powering the part through the I/O pad, which can potentially cause irreversible damage.
(4) MIN and MAX leakage current for the case when the I/O is voltage protected to VIO MIN or VIO MAX.
(5) If the I/O pad is not voltage limited, it should be current limited (to IINJ+ and IINJ-) if there is any possibility of the pad voltage exceeding the VIO limits (including transient behavior during supply ramp up, or at any time when the part is unpowered).