参数资料
型号: ST72F652R4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 47/160页
文件大小: 974K
代理商: ST72F652R4T1
ST7265
140/160
13.9 CONTROL PIN CHARACTERISTICS
13.9.1 Asynchronous RESET Pin
Subject to general operating conditions for VDD,fOSC,and TA unless otherwise specified.
Figure 90. Typical Application with RESET pin
8)
Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD=5V.
2. Data based on characterization results, not tested in production.
3. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.
4. The IIO current sunk must always respect the absolute maximum rating specified in Section 13.2.2 and the sum of IIO
(I/O ports and control pins) must not exceed IVSS.
5. The RON pull-up equivalent resistor is based on a resistive transistor (corresponding ION current characteristics de-
scribed in Figure 91). This data is based on characterization results, not tested in production.
5. To guarantee the reset of the device, a minimum pulse has to be applied to RESET pin.
6. All short pulse applied on RESET pin with a duration below th(RSTL)in can be ignored.
7. The reset network protects the device against parasitic resets, especially in a noisy environment.
8. The output of the external reset circuit must have an open-drain output to drive the ST7 reset pad. Otherwise the device
can be damaged when the ST7 generates an internal reset (LVD or watchdog).
Symbol
Parameter
Condit ions
Min
Typ 1)
Max
Unit
VIL
Input low level voltage 2)
0.3xVDD
V
VIH
Input high level voltage 2)
0.7xVDD
Vhys
Schmitt trigger voltage hysteresis 3)
400
mV
VOL
Output low level voltage 4)
VDD=5V
IIO=+5mA
0.68
0.95
V
IIO=+2mA
0.28
0.45
RON
Weak pull-up equivalent resistor 5)
VIN=VSS
VDD=5V
20
40
60
k
VDD=3.3V
80
100
120
tw(RSTL)out Generated reset pulse duration
External pin or
internal reset sources
4
1/fSFOSC
th(RSTL)in External reset pulse hold time
6)
20
s
tg(RSTL)in Filtered glitch duration
7)
100
ns
RESET
VDD
WATCHDOG RESET
ST72XXX
LVD RESET
INTERN AL
RON
0.1
F
VDD
0.1
F
VDD
4.7k
EXTERNAL
RESET
CIRCUI T 8)
RESET CONTROL
O
PT
IO
N
AL
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