STM32L552CCT3PTR datasheet(236/340 Pages) STMICROELECTRONICS

236 / 340 page

Electrical characteristics

STM32L552xx

236/340

DS12737 Rev 6

Figure 41. I/O AC characteristics definition(1)

1. Refer to Table 104: I/O AC characteristics (All I/Os except FT_c).

5.3.16

NRST pin characteristics

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

up resistor, RPU.

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized in

Table 27: General operating conditions.

Table 105. FT_c I/O AC characteristics(1)(2)

1. The I/O speed is configured using the OSPEEDRy[0] bit. Refer to the RM0438 reference manual for a

description of GPIO Port configuration register.

2. Guaranteed by design.

Speed Symbol

Parameter

Conditions

Min

Max

Unit

Fmax

Maximum

frequency

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

MHz

C=50 pF, 1.6 V≤VDDIOx≤2.7 V

C=50 pF, 1.08 V≤VDDIOx≤3.6 V

0.1

Tr/Tf

Output rise and

fall time

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

170

C=50 pF, 1.6 V≤VDDIOx≤2.7 V

330

C=50 pF, 1.08 V≤VDDIOx≤3.6 V

3300

Fmax

Maximum

frequency

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

MHz

C=50 pF, 1.6 V≤VDDIOx≤2.7 V

C=50 pF, 1.08 V≤VDDIOx≤3.6 V

0.7

Tr/Tf

Output rise and

fall time

C=50 pF, 2.7 V≤VDDIOx≤3.6 V

C=50 pF, 1.6 V≤VDDIOx≤2.7 V

C=50 pF, 1.08 V≤VDDIOx≤3.6 V

400

MS32132V2

10%

50%

90%

10%

50%

90%

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

when loaded by the specified capacitance.

r(IO)out

f(IO)out

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