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Obsolete
- Obsolete
Product(s)
ST72324B-Auto
Electrical characteristics
12.9
I/O port pin characteristics
12.9.1
General characteristics
Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.
Table 105.
General characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL
Input low level voltage
(standard voltage devices)(1)
0.3xVDD
V
VIH
Input high level voltage
(1)0.7xVDD
Vhys
Schmitt trigger voltage hysteresis(2)
0.7
IINJ(PIN)
(3)
Injected current on I/O pins other than
pin PB0(4)
VDD = 5V
±4
mA
Injected current on ROM and 32 Kbyte
Flash devices pin PB0
Injected current on 8/16 Kbyte Flash
devices pin PB0
0+4
ΣI
(3) Total injected current
(sum of all I/O and control pins)
VDD = 5V
±25
mA
Ilkg
Input leakage current
VSS < VIN < VDD
±1
A
IS
Static current consumption induced by
each floating input pin
Floating input mode(5)(6)
200
RPU
Weak pull-up equivalent resistor(7)
VIN = VSS, VDD = 5V
50
120
250
k
CIO
I/O pin capacitance
5
pF
tf(IO)out
Output high to low level fall time
(1)CL = 50pF
between 10% and 90%
25
ns
tr(IO)out
Output low to high level rise time
(1)25
tw(IT)in
External interrupt pulse time(8)
1tCPU
1.
Data based on characterization results, not tested in production.
2.
Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.
3.
When the current limitation is not possible, the VIN maximum must be respected, otherwise refer to the IINJ(PIN)
specification. A positive injection is induced by VIN >VDD while a negative injection is induced by VIN <VSS. Refer to
4.
No negative current injection allowed on 8/16 Kbyte Flash devices
5.
Static peak current value taken at a fixed VIN value, based on design simulation and technology characteristics, not tested
in production. This value depends on VDD and temperature values.
6.
The Schmitt trigger that is connected to every I/O port is disabled for analog inputs only when ADON bit is ON and the
particular ADC channel is selected (with port configured in input floating mode). When the ADON bit is OFF, static current
consumption may result. This can be avoided by keeping the input voltage of this pin close to VDD or VSS.
7.
The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics described in
8.
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.