Datasheet

DocID029968 Rev 3 143/210
STM32L452xx Electrical characteristics
186
In the user application, the number of I/O pins which can drive current must be limited to
respect the absolute maximum rating specified in
Section 6.2:
• The sum of the currents sourced by all the I/Os on V
DDIOx,
plus the maximum
consumption of the MCU sourced on V
DD,
cannot exceed the absolute maximum rating
I
VDD
(see Table 20: Voltage characteristics).
• The sum of the currents sunk by all the I/Os on V
SS
, plus the maximum consumption of
the MCU sunk on V
SS
, cannot exceed the absolute maximum rating I
VSS
(see
Table 20: Voltage characteristics).
Output voltage levels
Unless otherwise specified, the parameters given in the table below are derived from tests
performed under the ambient temperature and supply voltage conditions summarized in
Table 23: General operating conditions. All I/Os are CMOS- and TTL-compliant (FT OR TT
unless otherwise specified).
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 26 and
Table 73, respectively.
Table 72. Output voltage characteristics
(1)
Symbol Parameter Conditions Min Max Unit
V
OL
Output low level voltage for an I/O pin CMOS port
(2)
|I
IO
| = 8 mA
V
DDIOx
 2.7 V
-0.4
V
V
OH
Output high level voltage for an I/O pin V
DDIOx
-0.4 -
V
OL
(3)
Output low level voltage for an I/O pin TTL port
(2)
|I
IO
| = 8 mA
V
DDIOx
 2.7 V
-0.4
V
OH
(3)
Output high level voltage for an I/O pin 2.4 -
V
OL
(3)
Output low level voltage for an I/O pin
|I
IO
| = 20 mA
V
DDIOx
 2.7 V
-1.3
V
OH
(3)
Output high level voltage for an I/O pin V
DDIOx
-1.3 -
V
OL
(3)
Output low level voltage for an I/O pin
|I
IO
| = 4 mA
V
DDIOx
 1.62 V
-0.45
V
OH
(3)
Output high level voltage for an I/O pin V
DDIOx
-0.45 -
V
OL
(3)
Output low level voltage for an I/O pin
|I
IO
| = 2 mA
1.62 V  V
DDIOx
 1.08 V
-0.35V
DDIOx
V
OH
(3)
Output high level voltage for an I/O pin 0.65V
DDIOx
-
V
OLFM+
(3)
Output low level voltage for an FT I/O
pin in FM+ mode (FT I/O with "f"
option)
|I
IO
| = 20 mA
V
DDIOx
 2.7 V
-0.4
|I
IO
| = 10 mA
V
DDIOx
 1.62 V
-0.4
|I
IO
| = 2 mA
1.62 V  V
DDIOx
 1.08 V
-0.4
1. The I
IO
current sourced or sunk by the device must always respect the absolute maximum rating specified in Table 20:
Voltage characteristics, and the sum of the currents sourced or sunk by all the I/Os (I/O ports and control pins) must always
respect the absolute maximum ratings I
IO
.
2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.
3. Guaranteed by design.
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