STM32F051C8T7TR STMicroelectronics, STM32F051C8T7TR Datasheet - Page 56

• Manufacturer Part Number: STM32F051C8T7TR
• Description: ARM Microcontrollers - MCU Entry-level ARM Cortex-M0 MCU 64Kb
• Manufacturer: STMicroelectronics

Specifications of STM32F051C8T7TR

• Rohs: yes

STM32F051x
6.3.6
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 GPIO.
The external clock signal has to respect the I/O characteristics in
the recommended clock input waveform is shown in
Table 34.
1. Guaranteed by design, not tested in production.
Figure 12. High-speed external clock source AC timing diagram
Symbol
t
t
f
w(HSEH)
V
w(HSEL)
HSE_ext
V
t
t
r(HSE)
f(HSE)
HSEH
HSEL
User external clock source
frequency
OSC_IN input pin high level voltage
OSC_IN input pin low level voltage
OSC_IN high or low time
OSC_IN rise or fall time
High-speed external user clock characteristics
Parameter
Doc ID 022265 Rev 3
(1)
Conditions
Figure
12.
0.7V
Min
V
15
Electrical characteristics
1
Section
SS
-
DD
Typ
8
-
-
-
-
6.3.13. However,
0.3V
Max
V
32
20
DD
-
DD
57/105
MHz
Unit
ns
V