STM32H523CCU6 datasheet(141/228 Pages) STMICROELECTRONICS

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DS14540 Rev 1

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STM32H523xx

Electrical characteristics

197

5.3.15

NRST pin characteristics

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

resistor, RPU (see Table 56).

Unless otherwise specified, the parameters in Table 66 are derived from tests performed

under the ambient temperature and VDD supply voltage conditions summarized in Table 19.

Fmax(2)(4) Maximum frequency

C = 50 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

MHz

C = 40 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

C = 30 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

C = 20 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

C = 10 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

tr/tf(3)(4)

Output high to low level

fall time and output low

to high level rise time

C = 50 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

11.1

C = 40 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

9.2

C = 30 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

7.2

C = 20 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

5.4

C = 10 pF, 1.08 V ≤ VDDIO2 ≤ 1.32 V

3.6

1. Specified by design - Not tested in production.

2. The maximum frequency is defined with the conditions: (tr+tf) ≤ 2/3 T, Skew ≤ 1/20 T, 45%<Duty cycle<55%.

3. The fall and rise times are defined between 90% and 10% and between 10% and 90% of the output waveform, respectively.

4. Compensation system enabled.

Table 64. Output timing characteristics VDDIO2 1.2 V (HSLV ON)(1) (continued)

Speed

Symbol

Parameter

Conditions

Min

Max

Unit

Table 65. Output timing characteristics for FT_c I/Os (PB13/PB14)(1)(2)

Speed Symbol

Parameter

Conditions

Min

Max

Unit

Fmax

Maximum frequency

C = 50 pF, 2.7 V ≤ VDDIO ≤ 3.6 V

MHz

C = 50 pF, 1.71 V ≤ VDDIO < 2.7 V

tr/tf

Output rise and fall time

C = 50 pF, 2.7 V ≤ VDDIO < 3.6 V

166

C = 50 pF, 1.71 V ≤ VDDIO < 2.7 V

330

Frmax

Maximum frequency

C = 30 pF, 2.7 V ≤ VDDIO < 3.6 V

MHz

C = 30 pF, 1.71 V ≤ VDDIO < 2.7 V

tr/tf

Output rise and fall time

C = 30 pF, 2.7 V ≤ VDDIO < 3.6 V

C = 30 pF, 1.71 V ≤ VDDIO < 2.7 V

1. Specified by design - Not tested in production.

2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the product reference manual for a description of

GPIO port configuration register.

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