I/O Pin Characteristics

There are three different pin types with three different speeds: Backup, Normal, and High Sink(3,4).

The Drive Strength bit is located in the Pin Configuration register of the PORT (PORT.PINCFG.DRVSTR).

Table 1. I/O Pins Common Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
VIL Input low-level voltage VDD=1.62V-2.7V - - 0.25*VDD V
VDD=2.7V-3.63V - - 0.3*VDD
VIH Input high-level voltage VDD=1.62V-2.7V 0.7*VDD - -
VDD=2.7V-3.63V 0.55*VDD - -
VOL Output low-level voltage VDD>1.6V, IOL max - 0.1*VDD 0.2*VDD
VOH Output high-level voltage VDD>1.6V, IOH max 0.8*VDD 0.9*VDD -
RPULL Pull-up - Pull-down resistance All pins except PA24, PA25 20 40 60
PA24, PA25(1) 50 100 150
ILEAK Input leakage current Pull-up resistors disabled -1 +/-0.015 1 µA
Table 2. I/O Pins Maximum Output Current
Symbol Parameter Conditions Backup Pins in Backup Mode(4) Backup and Normal Pins(4) High Sink Pins(3) Backup and Normal Pins(4) High Sink Pins(3) Units
DRVSTR=0 DRVSTR=1  
IOL Maximum Output low-level current VDD=1.62V-3V 0.005 1 2 2 4 mA
VDD=3V-3.63V 0.008 2.5 6 6 12
IOH Maximum Output high-level current VDD=1.62V-3V 0.005 0.7 1.5 1.5 3
VDD=3V-3.63V 0.008 2 5 5 10
Table 3. I/O Pins Dynamic Characteristics(1)
Symbol Parameter Conditions Backup Pins in Backup Mode(4) Backup and Normal Pins(4) High Sink Pins(3) Backup and Normal Pins(4) High Sink Pins(3) Units
DRVSTR=0 DRVSTR=1
tRISE Maximum Rise time VDD=3.3V, load=20pF 2000 13 6 6 4.5 ns
tFALL Maximum Fall time VDD=3.3V, load=20pF 2000 12 7 7 4.5

The pins with I2C alternative mode available are compliant(2) with I2C norms. All I2C pins support Standard mode (Sm), Fast mode (Fm), Fast plus mode (Fm+), and High speed mode (Hs, up to 3.4MHz). The available I2C pins are listed in the I/O Multiplexing section.

Note:
  1. 1.These values are based on simulation. They are not covered by production test limits or characterization.
  2. 2.The pins PA12, PA13, PB12, PB13, PB16, PB17, PB30, PB31 are limited on output low-level current in I2C Standard mode (Sm) and Fast mode (Fm). The limitation is 2.5mA instead of 3mA for VOL=0.4V, and 3mA instead of 6mA for VOL=0.6V.
  3. 3.The following pins are High Sink pins and have different properties than normal pins:

    PA08, PA09, PA16, PA17, PA22, PA23, PA27, PA31.

  4. 4.The following pins are Backup pins and have different properties than normal pins:

    PA00, PA01, PB00, PB01, PB02, PB03.