CD00237391 Datasheet, PDF (99/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

STM32F20xxx
Electrical characteristics
Table 46. I/O AC characteristics⁽¹⁾⁽²⁾ (continued)
OSPEEDRy
[1:0] bit
value⁽¹⁾
Symbol
Parameter
Conditions
Min Typ Max Unit
F_max(IO)out Maximum frequency⁽³⁾
C_L = 30 pF, V_{DD >} 2.70 V
C_L = 30 pF, V_{DD >} 1.8 V
C_L = 10 pF, V_{DD >} 2.70 V
-
- 100⁽⁴⁾
-
-
50⁽⁴⁾
MHz
-
- 200⁽⁴⁾
C_L = 10 pF, V_{DD >} 1.8 V
-
- TBD
11
t_f(IO)out
Output high to low level fall
time
C_L = 20 pF, 2.4 < V_DD < 2.7 V -
C_L = 10 pF, V_DD > 2.7 V
-
- TBD
- TBD
ns
t_r(IO)out
Output low to high level rise
time
C_L = 20 pF, 2.4 < V_DD < 2.7 V
C_L = 10 pF, V_DD > 2.7 V
-
-
- TBD
- TBD
Pulse width of external signals
-
t_EXTIpw detected by the EXTI
controller
10 -
-
ns
1. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F20/21xxx reference manual for a
description of the GPIOx_SPEEDR GPIO port output speed register.
2. TBD stands for “to be defined”.
3. The maximum frequency is defined in Figure 36.
4. For maximum frequencies above 50 MHz, the compensation cell should be used.
Figure 36. I/O AC characteristics definition
90%
50%
10%
10%
50%
90%
EXT ERNAL
O UTP UT
ON 50pF
tr(I _O)out
tr(I _O)out
T
Maximum fr equency is achieved if (tr + tf) 2/3) T and if the duty cycle is (45-55%)
when loaded by 50pF
ai14131
Doc ID 15818 Rev 9
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