STM32F401CD datasheet(96/135 Pages) STMICROELECTRONICS

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Electrical characteristics

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Figure 31. I/O AC characteristics definition

6.3.17

NRST pin characteristics

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

resistor, RPU (see Table 54).

Unless otherwise specified, the parameters given in Table 57 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 14. Refer to Table 54: I/O static characteristics for the values of VIH and VIL for

NRST pin.

Table 57. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

RPU

Weak pull-up equivalent

resistor(1)

VIN = VSS

VF(NRST)(2) NRST Input filtered pulse

100

VNF(NRST)(2) NRST Input not filtered pulse

VDD > 2.7 V

300

TNRST_OUT Generated reset pulse duration

Internal Reset

source

µs

1. 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)

2. Guaranteed by design, not tested in production.

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