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STM32F103CBT7TR Datasheet(PDF) 66 Page - STMicroelectronics

Part # STM32F103CBT7TR
Description  Medium-density performance line Arm®-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 com. interfaces
PDF  116 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F103CBT7TR Datasheet(HTML) 66 Page - STMicroelectronics

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Electrical characteristics
STM32F103x8, STM32F103xB
66/116
DS5319 Rev 18
Figure 30. I/O AC characteristics definition
5.3.14
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 35).
Unless otherwise specified, the parameters given in Table 38 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 9.
ai14131c
10%
90%
50%
tr(IO)out
OUTPUT
EXTERNAL
ON 50pF
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
10%
50%
90%
when loaded by 50pF
T
tf(IO)out
Table 38. NRST pin characteristics
Symbol
Parameter
Conditions Min
Typ
Max
Unit
VIL(NRST)(1)
1. Specified by design, not tested in production.
NRST Input low level voltage
-
–0.5
-
0.8
V
VIH(NRST)(1) NRST Input high level voltage
-
2
-
VDD+0.5
Vhys(NRST) NRST Schmitt trigger voltage hysteresis
-
-
200
-
mV
RPU
Weak pull-up equivalent resistor(2)
2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to
the series resistance must be minimum (~10%).
VIN VSS
30
40
50
kΩ
VF(NRST)(1) NRST Input filtered pulse
-
-
-
100
ns
VNF(NRST)(1) NRST Input not filtered pulse
-
300
-
-
ns



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