STM8S003F3 STM8S003K3
Electrical characteristics
9.3.3
External clock sources and timing characteristics
HSE user external clock
Subject to general operating conditions for V
DD
and T
A
.
Table 32. HSE user external clock characteristics
Symbol
f
HSE_ext
V
HSEH(1)
V
HSEL
(1)
Parameter
User external clock source
frequency
OSCIN input pin high level
voltage
OSCIN input pin low level
voltage
OSCIN input leakage
current
Conditions
Min
0
Typ
-
-
-
-
Max
16
V
DD
+ 0.3 V
Unit
MHz
-
0.7 x V
DD
V
SS
V
0.3 x V
DD
1
µA
I
LEAK_HSE
V
SS
< V
IN
< V
DD
-1
1. Data based on characterization results, not tested in production.
Figure 17. HSE external clock source
HSE crystal/ceramic resonator oscillator
The HSE clock can be supplied with a 1 to 24 MHz crystal/ceramic resonator oscillator. All
the information given in this paragraph is based on characterization results with specified
typical external components. In the application, the resonator and the load capacitors have
to be placed as close as possible to the oscillator pins in order to minimize output distortion
and start-up stabilization time. Refer to the crystal resonator manufacturer for more details
(frequency, package, accuracy...).
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