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6.IO port characteristics

I/O port characteristics#

WizfFi250 is a small size wireless module. Unless otherwise specified, parameters are given as in the table below.
^Symbol^ Parameter ^Conditions^ Min ^Typ^ Max ^Unit^

VILStandard IO input low level voltage-0.30.28*(VDD-2V)+0.8VV
:::IO FT(1) input low level voltage-0.30.32*(VDD-2V)+0.75VV
VIHStandard IO input high level voltage0.41*(VDD-2V)+1.3VVDD+0.3V
:::IO FT(1) input high level voltageVDD > 2V0.42*(VDD-2V)+1V5.5V
::::::VDDโ‰ค 2V5.2
VhysStandard IO Schmitt trigger voltage hysteresis(2)200mV
:::IOFT Schmitt trigger voltage hysteresis(2)5%VDD(3)mV
IlkgInput leakage current(4)VSSโ‰คVINโ‰คVDD
Standard I/Os
::::::VIN=5V,I/O FT3
RPUWeak pull-up equivalent resistor(5)VIN=VSS304050k ฮฉ
RPDWeak pull-down equivalent resistor(5)VIN=VDD304050k ฮฉ
CIOI/O pin capacitance5pF

1. FT = Five-volt tolerant. In order to sustain a voltage higher than VDD+0.3 the internal pull-up/pull-down resistors must be disabled.
2. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization, not tested in production.
3. With a minimum of 100 mV.
4. Leakage could be higher than max. if negative current is injected on adjacent pins.
5. Pull-up and pull-down resistors are designed with a true resistance in series with a switchable PMOS/NMOS. The MOS/NMOS contribution to the series resistance is minimum(~10% order).