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13.8 I/O PORT PIN CHARACTERISTICS
13.8.1 General Characteristics
Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.
.Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD=5V.
2. Data based on characterization results, not tested in production.
3. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.
4. Configuration not recommended, all unused pins must be kept at a fixed voltage: using the output mode of the I/O for
example or an external pull-up or pull-down resistor (see
Figure ). Data based on design simulation and/or technology
characteristics, not tested in production.
5. The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics de-
scribed in Figure 89). This data is based on characterization results, tested in production at VDD=5V. 6. Data based on characterization results, not tested in production.
7. To generate an external interrupt, a minimum pulse width has to be applied on an I/O port pin configured as an external
interrupt source.
Figure 87Two typical Applications with unused I/O Pin
Symbol
Parameter
Conditions
Min
Typ 1)
Max
Unit
VIL
Input low level voltage
VDD = 5.0V
Vss
0.3xVDD
V
VIH
Input high level voltage
VDD = 5.0V
0.7xVDD
VDD
Vhys
Schmitt trigger voltage hysteresis 3)
400
mV
IL
Input leakage current
VSS≤VIN≤VDD
±1
A
IS
Static current consumption 4)
Floating input mode
200
RPU
Weak pull-up equivalent resistor 5)
VIN=VSS
VDD=5V
70
100
130
k
VDD=3V
130
200
260
CIO
I/O pin capacitance 6)
5pF
tf(IO)out
Output high to low level fall time 6)
CL=50pF
Between 10% and 90%
25
ns
tr(IO)out
Output low to high level rise time 6)
25
tw(IT)in
External interrupt pulse time 7)
1tCPU
10k
UNUSED I/O PORT
ST72XXX
10k
UNUSED I/O PORT
ST72XXX
VDD