STM32F378XX Datasheet, PDF (86/131 Pages) STMicroelectronics – Reset and power management

Electrical characteristics
STM32F378xx
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 20 and
Table 52, respectively.
Unless otherwise specified, the parameters given are derived from tests performed under
ambient temperature and V_DD supply voltage conditions summarized in Table 22.
Table 52. I/O AC characteristics⁽¹⁾
OSPEEDRy
[1:0] value⁽¹⁾
Symbol
Parameter
Conditions
Min Max Unit
f_max(IO)out Maximum frequency⁽²⁾ C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
1 MHz
x0
t_f(IO)out
Output high to low level
fall time
- 125⁽³⁾
t_r(IO)out
Output low to high level
rise time
C_L = 50 pF, V_DD = 1.65 V to 1.95 V
ns
- 125⁽³⁾
f_max(IO)out Maximum frequency⁽²⁾ C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
4 MHz
01
t_f(IO)out
Output high to low level
fall time
- 62.5
t_r(IO)out
Output low to high level
rise time
C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
62.5
ns
f_max(IO)out Maximum frequency⁽²⁾⁽³⁾ C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
10 MHz
11
t_f(IO)out
Output high to low level
fall time
C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
25
ns
t_r(IO)out
Output low to high level
rise time
C_L = 50 pF, V_DD = 1.65 V to 1.95 V
-
25
f_max(IO)out Maximum frequency⁽²⁾
- 0.5 MHz
FM+
configuration
(4)
t_f(IO)out
Output high to low level
fall time
CL = 50 pF, V_DD = 1.65 V to 1.95 V
-
16
ns
t_r(IO)out
Output low to high level
rise time
-
44
Pulse width of external
-
t_EXTIpw signals detected by the
EXTI controller
-
10
-
ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0313 reference manual for a description of
GPIO Port configuration register.
2. The maximum frequency is defined in Figure 20.
3. Guaranteed by design.
4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F37xx reference manual RM0313 for a
description of FM+ I/O mode configuration
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