Datasheet

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STM32F051x4 STM32F051x6 STM32F051x8 Electrical characteristics
90
Output driving current
The GPIOs (general purpose input/outputs) can sink or source up to +/-8 mA, and sink or
source up to +/- 20 mA (with a relaxed V
OL
/V
OH
).
In the user application, the number of I/O pins whic
h 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
ΣI
VDD
(see Table 17: 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 ΣI
VSS
(see
Table 17: 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 20: General operating conditions. All I/Os are CMOS- and TTL-compliant (FT, TTa or
TC unless otherwise specified).
Table 49. 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
Output low level voltage for an I/O pin TTL 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 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
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
| = 6 mA
-0.4
V
V
OH
(3)
Output high level voltage for an I/O pin V
DDIOx
–0.4 -
V
OLFm+
(3)
Output low level voltage for an FTf I/O pin in
Fm+ mode
|I
IO
| = 20 mA
V
DDIOx
≥ 2.7 V
-0.4V
|I
IO
| = 10 mA - 0.4 V
1. The I
IO
current sourced or sunk by the device must always respect the absolute maximum rating specified in Table 17:
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 ΣI
IO
.
2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.
3. Data based on characterization results. Not tested in production.
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