Datasheet

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STM32F446xC/E Electrical characteristics
175
Figure 32. I/O AC characteristics definition
6.3.18 NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, R
PU
(see Table 56: I/O static characteristics).
Unless otherwise specified, the parameters given in Table 59 are derived from tests
performed under the ambient temperature and V
DD
supply voltage conditions summarized
in
Table 16.
1. Guaranteed by design.
2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F4xx reference manual for a description of
the GPIOx_SPEEDR GPIO port output speed register.
3. The maximum frequency is defined in Figure 32.
4. For maximum frequencies above 50 MHz and
V
DD
> 2.4 V, the compensation cell should be used.
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Table 59. NRST pin characteristics
Symbol Parameter Conditions Min Typ Max Unit
R
PU
Weak pull-up equivalent resistor
(1)
V
IN
= V
SS
30 40 50 kΩ
V
F(NRST)
(2)
NRST Input filtered pulse - - - 100 ns
V
NF(NRST)
(2)
NRST Input not filtered pulse V
DD
> 2.7 V 300 - - ns
T
NRST_OUT
Generated reset pulse duration Internal Reset source 20 - - 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.
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