Datasheet

STM8S207xx, STM8S208xx Electrical characteristics
Doc ID 14733 Rev 12 55/103
10.3 Operating conditions
The device must be used in operating conditions that respect the parameters in Tabl e 18. In
addition, full account must be taken of all physical capacitor characteristics and tolerances.
Table 18. General operating conditions
Symbol Parameter Conditions Min Max Unit
f
CPU
Internal CPU clock frequency
T
A
≤ 105 °C 0 24 MHz
0 16 MHz
V
DD/
V
DD_IO
Standard operating voltage 2.95 5.5 V
V
CAP
(1)
1. Care should be taken when selecting the capacitor, due to its tolerance, as well as the parameter
dependency on temperature, DC bias and frequency in addition to other factors. The parameter maximum
value must be respected for the full application range.
C
EXT
: capacitance of
external capacitor
470 3300 nF
ESR of external capacitor
at 1 MHz
(2)
2. This frequency of 1 MHz as a condition for V
CAP
parameters is given by design of internal regulator.
-0.3
Ω
ESL of external capacitor - 15 nH
P
D
(3)
3. To calculate P
Dmax
(T
A
), use the formula P
Dmax
= (T
Jmax
- T
A
)/Θ
JA
(see Section 11.2: Thermal
characteristics on page 95) with the value for T
Jmax
given in Table 18 above and the value for Θ
JA
given in
Table 57: Thermal characteristics.
Power dissipation at
T
A
= 85° C for suffix 6
or T
A
= 125° C for suffix 3
44, 48, 64, and 80-pin
devices, with output on 8
standard ports, 2 high sink
ports and 2 open drain ports
simultaneously
(4)
4. Refer to Section 11.2: Thermal characteristics on page 95 for the calculation method.
443
mW
32-pin package, with output
on 8 standard ports and 2
high sink ports
simultaneously
(4)
360
T
A
Ambient temperature for 6
suffix version
Maximum power dissipation -40 85
°C
Ambient temperature for 3
suffix version
Maximum power dissipation -40 125
T
J
Junction temperature range
6 suffix version -40 105
3 suffix version -40 130
(5)
5. T
Jmax
is given by the test limit. Above this value the product behavior is not guaranteed.