参数资料
型号: STM32F205RET7XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 120 MHz, RISC MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, ROHS COMPLIANT, LQFP-64
文件页数: 158/163页
文件大小: 2275K
代理商: STM32F205RET7XXX
Electrical characteristics
STM32F205xx, STM32F207xx
Doc ID 15818 Rev 7
5.3.17
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 41).
Unless otherwise specified, the parameters given in Table 44 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
Figure 37.
Recommended NRST pin protection
2.
The reset network protects the device against parasitic resets.
3.
The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in
Table 44. Otherwise the reset is not taken into account by the device.
Table 44.
NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)
(1)
1.
Guaranteed by design, not tested in production.
NRST Input low level voltage
–0.5
-
0.8
V
VIH(NRST)
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% order)
.
VIN = VSS
30
40
50
k
Ω
VF(NRST)
NRST Input filtered pulse
-
100
ns
VNF(NRST)
NRST Input not filtered pulse
VDD > 2.7 V
300
-
ns
TNRST_OUT Generated reset pulse duration
Internal
Reset source
20
-
s
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