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参数资料
型号： ST72F611F1B1
英文描述： 64Mb EDO/FPM - OBSOLETE
中文描述： ST7的-低速USB 8 - 3端点位MCU。闪存。内径。水分散粒剂。定时器
文件页数： 44/161页
文件大小： 2070K
代理商： ST72F611F1B1
ST72324
138/161
12.9 CONTROL PIN CHARACTERISTICS
12.9.1 Asynchronous RESET Pin
Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified.
Figure 85. Typical Application with RESET pin 6)7)8)
Notes:
1. Data based on characterization results, not tested in production.
2. Hysteresis voltage between Schmitt trigger switching levels.
3. The IIO current sunk must always respect the absolute maximum rating specified in Section 12.2.2 and the sum of IIO
(I/O ports and control pins) must not exceed IVSS.
4. To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses applied on
the RESET pin with a duration below th(RSTL)in can be ignored.
5. The reset network (the resistor and two capacitors) protects the device against parasitic resets, especially in noisy en-
vironments.
6. 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).
7. Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below
the VIL max. level specified in Section 12.9.1 . Otherwise the reset will not be taken into account internally.
8. Because the reset circuit is designed to allow the internal RESET to be output in the RESET pin, the user must ensure
that the current sunk on the RESET pin (by an external pull-up for example) is less than the absolute maximum value
specified for IINJ(RESET) in Section 12.2.2 on page 114.
9. Data guaranteed by design, not tested in production.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL
Input low level voltage 1)
0.16xVDD
V
VIH
Input high level voltage 1)
0.85xVDD
Vhys
Schmitt trigger voltage hysteresis 2)
2.5
VOL
Output low level voltage 3)
VDD=5V
IIO=+2mA
0.2
0.5
IIO
Input current on RESET pin
2
TBD
mA
RON
Weak pull-up equivalent resistor
20
30
120
k
tw(RSTL)out Generated reset pulse duration
External pin
0
429)
s
Internal reset sources
20
30
429)
s
th(RSTL)in External reset pulse hold time
4)
2.5
s
tg(RSTL)in Filtered glitch duration
5)
200
ns
0.01
F
VDD
0.01
F
EXTERNAL
RESET
CIRCUIT 5)
USER
VDD
4.7k
Required if LVD is disabled
Recommended
if LVD is disabled
ST72XXX
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
LVD RESET
INTERNAL
RESET
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