STM32F051R4T6TR STMicroelectronics, STM32F051R4T6TR Datasheet - Page 57

• Manufacturer Part Number: STM32F051R4T6TR
• Description: ARM Microcontrollers - MCU ARM Cortex M0 16kB 48 MHz CPU 8kB Flash
• Manufacturer: STMicroelectronics

Specifications of STM32F051R4T6TR

• Rohs: yes

Electrical characteristics
58/105
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 GPIO.
The external clock signal has to respect the I/O characteristics in
the recommended clock input waveform is shown in
Table 35.
1. Guaranteed by design, not tested in production.
Figure 13. Low-speed external clock source AC timing diagram
Symbol
t
t
f
w(LSEH)
LSE_ext
V
w(LSEL)
V
t
t
r(LSE)
f(LSE)
LSEH
LSEL
User External clock source
frequency
OSC32_IN input pin high level
voltage
OSC32_IN input pin low level
voltage
OSC32_IN high or low time
OSC32_IN rise or fall time
Low-speed external user clock characteristics
Parameter
Doc ID 022265 Rev 3
(1)
Conditions
Figure
0.7V
13.
Min
V
450
-
SS
-
DD
Section
32.768
Typ
-
-
-
-
6.3.13. However,
0.3V
STM32F051x
1000
Max
V
50
DD
-
DD
Unit
kHz
ns
V