STM32F398VE datasheet(117/151 Pages) STMICROELECTRONICS

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STM32F398VE

Electrical characteristics

142

Figure 34. I/O AC characteristics definition

1. See Table 64: 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 62).

Unless otherwise specified, the parameters given in Table 65 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 18

Table 65. 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

700(1)

1. Guaranteed by design, not tested in production.

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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