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STM32F446MC Datasheet(PDF) 123 Page - STMicroelectronics

Part # STM32F446MC
Description  ARM® Cortex®-M4 32b MCUFPU, 225DMIPS, up to 512kB Flash/1284KB RAM, USB OTG HS/FS, 17 TIMs, 3 ADCs, 20 comm. interfaces
PDF  202 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F446MC Datasheet(HTML) 123 Page - STMicroelectronics

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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, RPU (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 VDD 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
VDD > 2.4 V, the compensation cell should be used.
Table 59. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RPU
Weak pull-up equivalent resistor(1)
VIN = VSS
30
40
50
k
Ω
VF(NRST)(2) NRST Input filtered pulse
-
-
-
100
ns
VNF(NRST)(2) NRST Input not filtered pulse
VDD > 2.7 V
300
-
-
ns
TNRST_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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