STM32F051R6T6 Datasheet, PDF (72/104 Pages) STMicroelectronics – Low- and medium-density advanced ARM-based 32-bit MCU

STM32F051x
Electrical characteristics
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 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_DD, plus the maximum Run
consumption of the MCU sourced on V_DD, cannot exceed the absolute maximum rating
I_VDD (see Table 18).
● The sum of the currents sunk by all the I/Os on V_SS plus the maximum Run
consumption of the MCU sunk on V_SS cannot exceed the absolute maximum rating
I_VSS (see Table 18).
Output voltage levels
Unless otherwise specified, the parameters given in Table 51 are derived from tests
performed under ambient temperature and V_DD supply voltage conditions summarized in
Table 20. All I/Os are CMOS and TTL compliant (FT, TTa or TC unless otherwise specified).
Table 51. Output voltage characteristics
Symbol
Parameter
Conditions
Min
Max Unit
V_OL(1)
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
CMOS port⁽²⁾
-
0.4
I_IO = +8 mA
V
V_OH(3)
Output high level voltage for an I/O pin
when 8 pins are sourced at same time
2.7 V < V_DD < 3.6 V V_DD–0.4
-
V_OL ⁽¹⁾
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
TTL port⁽²⁾
-
I_IO =+ 8mA
V_OH ⁽³⁾
Output high level voltage for an I/O pin
when 8 pins are sourced at same time
2.7 V < V_DD < 3.6 V
2.4
0.4
V
-
V_OL(1)(4)
Output low level voltage for an I/O pin
when 5 pins are sunk at same time
I_IO = +20 mA
-
1.3
V
V_OH(3)(4)
Output high level voltage for an I/O pin
when 5 pins are sourced at same time
2.7 V < V_DD < 3.6 V _VDD–1.3
-
V_OL(1)(4)
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
I_IO = +6 mA
-
0.4
V
V_OH(3)(4)
Output high level voltage for an I/O pin
when 8 pins are sourced at same time
2 V < V_DD < 2.7 V _VDD–0.4
-
V_OLFM+
Output low level voltage for an FTf I/O
pin in FM+ mode
I_IO = +20 mA
2.7 V < V_DD < 3.6 V
-
0.4 V
1. The I_IO current sunk by the device must always respect the absolute maximum rating specified in Table 18
and the sum of I_IO (I/O ports and control pins) must not exceed I_VSS.
2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.
3. The I_IO current sourced by the device must always respect the absolute maximum rating specified in
Table 18 and the sum of I_IO (I/O ports and control pins) must not exceed I_VDD.
4. Data based on characterization results, not tested in production.
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