54.9 I/O Pin Characteristics

The pins have two different speeds controlled by the Drive Strength bit located in the Pin Configuration register PORT (PORT.PINCFG.DRVSTR).

Note: The PA24 and PA25 pads do not have Drive Strength capability.

Table 54-12. I/O Pins Common Characteristics
Symbol	Parameter	Conditions	Min.	Typ.	Max.	Units
V_IL	Input Low-Level Voltage	V_DD= 1.71V-3.6V	-	-	0.3 × V_DD	V
V_IH	Input High-Level Voltage	V_DD= 1.71V-3.6V	0.7 × V_DD	-	-
V_OL	Output Low-Level Voltage	V_DD> 1.71V, I_OL max	-	0.1 × V_DD	0.2 × V_DD
V_OH	Output High-Level Voltage	V_DD> 1.71V, I_OH max	0.8 × V_DD	0.9 × V_DD	-
R_PULL	Pull-up/Pull-down Resistance	-	20	40	60	kΩ
R_PULL	Pull-down resistance on pads PA24 and PA25	-	14	23	28	kΩ
I_LEAK	Input Leakage Current	Pull-up resistors disabled	-1	±0.015	1	µA

Table 54-13. I/O Pins Maximum Output Current^(2,3)
Symbol	Parameter	Conditions	Backup Pins in Backup Mode	Normal Mode (all I/O pins)	Normal Mode (all I/O except Backup pins)	Normal mode (Backup pins)	Units
Symbol	Parameter	Conditions	Backup Pins in Backup Mode	DRVSTR = 0	DRVSTR = 1	DRVSTR = 1	Units
I_OL	Maximum Output low-level current	1.71V<= V_DD <3.0V	0.005	0.5	3	3	mA
I_OL	Maximum Output low-level current	3.0V <= V_DD <= 3.63V	0.01	2	8	8
I_OH	Maximum Output high-level current	1.71V <= V_DD < 3.0V	0.005	0.5	3	2
I_OH	Maximum Output high-level current	3.0V <= V_DD <= 3.63V	0.01	2	8	6

Table 54-14. I/O Pins Dynamic Characteristics (see Notes 1, 2, 3 and 4)
Symbol	Parameter	Conditions	Backup Pins in Backup Mode	Normal Mode (all I/O pins)	Normal Mode (all I/O pins)	Units
Symbol	Parameter	Conditions	Backup Pins in Backup Mode	DRVSTR = 0	DRVSTR = 1	Units
t_RISE	Maximum Rise Time	C_LOAD = 30 pF	4	0.04	0.01	µs
t_FALL	Maximum Fall Time	C_LOAD = 30 pF	4	0.04	0.01	µs

The pins with I²C alternative mode available are compliant with I²C specification.

All I²C pins support Standard mode (Sm), Fast mode (Fm), Fast-plus mode (Fm+), and High-Speed mode (HS). The available I²C pins are listed in the section “I/O Multiplexing”. When an I/O pin multiplexing value is set to an I²C function, internal pull-up/pull-down resistors are disabled.

Note:

These values are based on simulation. They are not covered by production test limits or characterization.
The PA08, PA09, PA12, PA13, PA16, PA17, PA22, PA23, PD08, PD09 pins have faster fall-time in I²C Fast Plus mode (Fm+) and High-Speed mode (HS). The fall-time can be in 1.5 ns range in Fm+ mode and in 1 ns range in HS mode.
The following pins are Backup pins and have different properties than normal pins: PA00, PA01, PB00, PB01, PB02, PB03, PC00, PC01.
The USB pads, PA24 and PA25, are compliant to the USB standard in USB mode.