Datasheet
ST7LITE0xY0, ST7LITESxY0
95/124
13.8 I/O PORT PIN CHARACTERISTICS
13.8.1 General Characteristics
Subject to general operating conditions for V
DD
, f
OSC
, and T
A
unless otherwise specified.
Notes:
1. Data based on characterization results, not tested in production.
2. 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 66). Static peak current value taken at a fixed V
IN
value,
based on design simulation and technology characteristics, not tested in production. This value depends on V
DD
and tem-
perature values.
3. The R
PU
pull-up equivalent resistor is based on a resistive transistor (corresponding I
PU
current characteristics de-
scribed in Figure 63).
4. 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 62. Two typical applications with unused I/O pin configured as input
Figure 63. Typical I
PU
vs. V
DD
with V
IN
=V
SS
l
Symbol Parameter Conditions Min Typ Max Unit
V
IL
Input low level voltage V
SS
- 0.3 0.3xV
DD
V
V
IH
Input high level voltage 0.7xV
DD
V
DD
+ 0.3
V
hys
Schmitt trigger voltage
hysteresis
1)
400 mV
I
L
Input leakage current V
SS
≤V
IN
≤V
DD
±1
µA
I
S
Static current consumption induced by
each floating input pin
2)
Floating input mode 400
R
PU
Weak pull-up equivalent resistor
3)
V
IN
=V
SS
V
DD
=5V 50 120 250
kΩ
V
DD
=3V 160
C
IO
I/O pin capacitance 5 pF
t
f(IO)out
Output high to low level fall time
1)
C
L
=50pF
Between 10% and 90%
25
ns
t
r(IO)out
Output low to high level rise time
1)
25
t
w(IT)in
External interrupt pulse time
4)
1t
CPU
10kΩ
UNUSED I/O PORT
ST7XXX
10kΩ
UNUSED I/O PORT
ST7XXX
V
DD
Caution: During normal operation the ICCCLK pin must be pulled- up, internally or externally
(external pull-up of 10k mandatory in This is to avoid entering ICC mode unexpectedly during a reset. noisy environment).
Note: I/O can be left unconnected if it is configured as output (0 or 1) by the software. This has the advantage of greater EMC
robustness and lower cost.
TO BE CHARACTERIZED
0
10
20
30
40
50
60
70
80
90
22.533.544.555.56
Vdd(V)
Ipu(uA)
Ta=140°C
Ta=95°C
Ta=25°C
Ta=-45°C
1