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STM32F427AI 数据表(PDF) 119 Page - STMicroelectronics

部件名 STM32F427AI
功能描述  32b Arm® Cortex®-M4 MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 com. interfaces, camera & LCD-TFT
PDF  240 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STM32F427AI 数据表(HTML) 119 Page - STMicroelectronics

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DS9405 Rev 12
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STM32F427xx STM32F429xx
Electrical characteristics
197
Low-speed external user clock generated from an external source
In bypass mode the LSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the Table 57: I/O static characteristics. However, the
recommended clock input waveform is shown in Figure 28.
The characteristics given in Table 38 result from tests performed using a low-speed external
clock source, and under ambient temperature and supply voltage conditions summarized in
Table 17.
Figure 27. High-speed external clock source AC timing diagram
Table 38. Low-speed external user clock characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE_ext
User External clock source
frequency(1)
-
-
32.768
1000
kHz
VLSEH
OSC32_IN input pin high level
voltage
0.7VDD
-VDD
V
VLSEL
OSC32_IN input pin low level voltage
VSS
-0.3VDD
tw(LSE)
tf(LSE)
OSC32_IN high or low time(1)
450
-
-
ns
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time(1)
--
50
Cin(LSE)
OSC32_IN input capacitance(1)
--
5
-
pF
DuCy(LSE) Duty cycle
-
30
-
70
%
IL
OSC32_IN Input leakage current
VSS ≤ VIN ≤ VDD
--
±1
µA
1. Specified by design.
ai17528
OSC_IN
External
STM32F
clock source
VHSEH
tf(HSE)
tW(HSE)
IL
90 %
10 %
THSE
t
tr(HSE)
tW(HSE)
fHSE_ext
VHSEL



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