Datasheet

DS7147 Rev 10 61/103
STM8S003F3 STM8S003K3 Electrical characteristics
87
9.3.3 External clock sources and timing characteristics
HSE user external clock
Subject to general operating conditions for V
DD
and T
A
.
Figure 17. HSE external clock source
HSE crystal/ceramic resonator oscillator
The HSE clock can be supplied with a 1 to 16 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...).
Table 32. HSE user external clock characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
HSE_ext
User external clock source
frequency
-
0-16MHz
V
HSEH
(1)
1. Data based on characterization results.
OSCIN input pin high level
voltage
0.7 x V
DD
-V
DD
+ 0.3 V
V
V
HSEL
(1)
OSCIN input pin low level
voltage
V
SS
- 0.3 x V
DD
I
LEAK_HSE
OSCIN input leakage
current
V
SS
< V
IN
< V
DD
-1 - +1 µA
V
HSEH
V
HSEL
External clock
source
OSCIN
f
HSE
STM8
MS36489V2