CD00237391 Datasheet, PDF (97/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

STM32F20xxx
Electrical characteristics
All I/Os are CMOS and TTL compliant (no software configuration required). Their
characteristics cover more than the strict CMOS-technology or TTL parameters.
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) except PC13, PC14 and PC15 which can
sink or source up to ±3mA. When using the PC13 to PC15 GPIOs in output mode, the
speed should not exceed 2 MHz with a maximum load of 30 pF.
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 5.2:
● 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 10).
● 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 10).
Output voltage levels
Unless otherwise specified, the parameters given in Table 45 are derived from tests
performed under ambient temperature and V_DD supply voltage conditions summarized in
Table 12. All I/Os are CMOS and TTL compliant.
Table 45. Output voltage characteristics⁽¹⁾
Symbol
Parameter
Conditions
Min
Max Unit
V_OL(2)
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
CMOS ports
-
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 _VDD–0.4
-
V_OL ⁽²⁾
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
TTL ports
-
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(2)(4)
Output low level voltage for an I/O pin
when 8 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 8 pins are sourced at same time
2.7 V < V_DD < 3.6 V _VDD–1.3
-
V_OL(2)(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
-
1. PC13, PC14, PC15 and PI8 are supplied through the power switch. Since the switch only sinks a limited
amount of current (3 mA), the use of GPIOs PC13 to PC15 and PI8 in output mode is limited: the speed
should not exceed 2 MHz with a maximum load of 30 pF and these I/Os must not be used as a current
source (e.g. to drive an LED).
2. The I_IO current sunk by the device must always respect the absolute maximum rating specified in Table 10
and the sum of I_IO (I/O ports and control pins) must not exceed I_VSS.
3. The I_IO current sourced by the device must always respect the absolute maximum rating specified in
Table 10 and the sum of I_IO (I/O ports and control pins) must not exceed I_VDD.
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