STM32L151C6U6 datasheet(85/131 Pages) STMICROELECTRONICS

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STM32L151x6/8/B, STM32L152x6/8/B

Electrical characteristics

105

Figure 19. I/O AC characteristics definition

6.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU (see Table 45).

Unless otherwise specified, the parameters given in Table 45 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 13.

Fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDD = 2.7

V to 3.6 V

-50

MHz

CL = 50 pF, VDD =

1.65 V to 2.7 V

-8

tf(IO)out

tr(IO)out

Output rise and fall time

CL = 30 pF, VDD = 2.7

V to 3.6 V

-5

CL = 50 pF, VDD =

1.65 V to 2.7 V

-30

-tEXTIpw

Pulse width of external

signals detected by the

EXTI controller

-8

1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the STM32L15xxx reference manual

for a description of GPIO Port configuration register.

2. Guaranteed by design. Not tested in production.

3. The maximum frequency is defined in Figure 19.

Table 44. I/O AC characteristics(1) (continued)

OSPEEDRx

[1:0] bit

value(1)

Symbol

Parameter

Conditions

Min

Max(2) Unit

ai14131b

10%

90%

50%

tr( IO)out

External

Output

on 50pF

Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)

10%

50%

90%

when loaded by 50 pF

tf(IO)out

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