STM32F302X6 datasheet(91/139 Pages) STMICROELECTRONICS

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DS9896 Rev 8

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STM32F302x6 STM32F302x8

Electrical characteristics

117

Figure 23. I/O AC characteristics definition

1. See Table 55: I/O AC characteristics.

6.3.15

NRST pin characteristics

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

resistor, RPU (see Table 53).

Unless otherwise specified, the parameters given in Table 56 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 23.

MS34942V1

10%

90%

50%

tr(IO)out

External

output on CL

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

10%

50%

90%

when loaded by CL

tf(IO)out

(see note 1).

Table 56. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1) NRST Input low level voltage

0.3VDD+

0.07(1)

VIH(NRST)(1) NRST Input high level voltage

0.445VDD+

0.398(1)

Vhys(NRST) NRST Schmitt trigger voltage hysteresis

200

RPU

Weak pull-up equivalent resistor(2)

VIN = VSS

VF(NRST)(1) NRST Input filtered pulse

100(1)

VNF(NRST)(1) NRST Input not filtered pulse

500(1)

1. Guaranteed by design.

2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series

resistance must be minimum

(~10% order)

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