STM32F446MC Datasheet, PDF (103/201 Pages) STMicroelectronics – 8- to 14-bit parallel camera interface up to 54 Mbytes

STM32F446xC/E
Electrical characteristics
Table 37. High-speed external user clock characteristics
Symbol
Parameter
Conditions
Min Typ Max Unit
f_{HSE_ext}
External user clock source
frequency⁽¹⁾
1
-
50 MHz
V_HSEH OSC_IN input pin high level voltage
0.7V_DD -
V_DD
V
V_HSEL OSC_IN input pin low level voltage
-
V_SS
- 0.3V_DD
t_w(HSE)
t_w(HSE)
t_r(HSE)
t_f(HSE)
OSC_IN high or low time⁽¹⁾
OSC_IN rise or fall time⁽¹⁾
5
-
-
ns
-
-
10
C_in(HSE) OSC_IN input capacitance⁽¹⁾
-
-
5
-
pF
DuCy_(HSE) Duty cycle
-
45
-
55
%
I_L
OSC_IN Input leakage current
V_SS ≤ V_IN ≤ V_DD
-
-
±1
µA
1. Guaranteed by design.
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 56: I/O static characteristics. However, the
recommended clock input waveform is shown in Figure 24.
The characteristics given in Table 38 result from tests performed using an low-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 16.
Table 38. Low-speed external user clock characteristics
Symbol
Parameter
Conditions
Min
Typ
f_{LSE_ext}
User External clock source
frequency⁽¹⁾
V_LSEH
OSC32_IN input pin high level
voltage
V_LSEL OSC32_IN input pin low level voltage
t_w(LSE)
t_f(LSE)
OSC32_IN high or low time⁽¹⁾
t_r(LSE)
t_f(LSE)
C_in(LSE)
OSC32_IN rise or fall time⁽¹⁾
OSC32_IN input capacitance⁽¹⁾
DuCy_(LSE) Duty cycle
I_L
OSC32_IN Input leakage current
1. Guaranteed by design.
-
-
-
V_SS ≤ V_IN ≤ V_DD
-
32.768
0.7V_DD
-
V_SS
-
450
-
-
-
-
5
30
-
-
-
Max
1000
V_DD
0.3V_DD
-
200
-
70
±1
Unit
kHz
V
ns
pF
%
µA
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