STM32F103ZCH6 Datasheet, PDF (56/130 Pages) STMicroelectronics – High-density performance line ARM-based 32-bit MCU with 256 to 512KB Flash, USB, CAN, 11 timers, 3 ADCs, 13 communication interfaces

Electrical characteristics
STM32F103xC, STM32F103xD, STM32F103xE
Low-speed external user clock generated from an external source
The characteristics given in Table 22 result from tests performed using an low-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 10.
Table 22. Low-speed external user clock characteristics
Symbol
Parameter
Conditions
Min
Typ
Max Unit
f_{LSE_ext}
User External clock source
frequency⁽¹⁾
32.768 1000 kHz
V_LSEH
V_LSEL
OSC32_IN input pin high level
voltage
OSC32_IN input pin low level
voltage
0.7V_DD
V_SS
V_DD
V
0.3V_DD
t_w(LSE)
t_w(LSE)
OSC32_IN high or low time⁽¹⁾
450
t_r(LSE)
t_f(LSE)
OSC32_IN rise or fall time⁽¹⁾
C_in(LSE) OSC32_IN input capacitance⁽¹⁾
5
DuCy_(LSE) Duty cycle
30
I_L
OSC32_IN Input leakage current ^{VSS ≤ VIN ≤ VD}
D
ns
50
pF
70
%
±1
µA
1. Guaranteed by design, not tested in production.
Figure 20. High-speed external clock source AC timing diagram
VHSEH
VHSEL
90%
10%
tr(HSE)
tf(HSE)
THSE
EXTER NAL
fHSE_ext
CLOCK SOURC E
OSC _IN
tW(HSE)
tW(HSE) t
IL
STM32F103xx
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Doc ID 14611 Rev 8