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STM32F412RGU3 Datasheet(PDF) 107 Page - STMicroelectronics

Part # STM32F412RGU3
Description  Arm®-Cortex®-M4 32b MCUFPU, 125 DMIPS, 1MB Flash, 256KB RAM, USB OTG FS, 17 TIMs, 1 ADC, 17 comm. interfaces
PDF  201 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F412RGU3 Datasheet(HTML) 107 Page - STMicroelectronics

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DocID028087 Rev 7
107/201
STM32F412xE/G
Electrical characteristics
166
6.3.8
External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the Table 57. However, the recommended clock input
waveform is shown in Figure 27.
The characteristics given in Table 39 result from tests performed using an high-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 16.
Table 39. High-speed external user clock characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fHSE_ext
External user clock source
frequency(1)
1-
50
MHz
VHSEH
OSC_IN input pin high level voltage
0.7VDD
-VDD
V
VHSEL
OSC_IN input pin low level voltage
VSS
-0.3VDD
tw(HSE)
tw(HSE)
OSC_IN high or low time(1)
1. Guaranteed by design, not tested in production.
5-
-
ns
tr(HSE)
tf(HSE)
OSC_IN rise or fall time(1)
--
10
Cin(HSE) OSC_IN input capacitance(1)
-5
-
pF
DuCy(HSE) Duty cycle
45
-
55
%
IL
OSC_IN Input leakage current
VSS ≤VIN ≤VDD
--
±1
µA



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