参数资料
型号: ST72324K6B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 43/157页
文件大小: 1037K
代理商: ST72324K6B3/XXX
ST72324J/K
137/157
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 88. Typical Application with RESET pin 7)8)9)
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 12.2.2 and the sum of IIO
(I/O ports and control pins) must not exceed IVSS.
5. 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.
6. The reset network (the resistor and two capacitors) protects the device against parasitic resets, especially in noisy en-
vironments.
7. 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).
8. 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.
9. 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-p for example) is less than the absolute maximum value spec-
ified for IINJ(RESET) in Section 12.2.2 on page 113.
10. Data guaranteed by design, not tested in production.
Symbol
Parameter
Condit ions
Min
Typ 1)
Max
Unit
VIL
Input low level voltage 2)
0.16xV
DD
V
VIH
Input high level voltage 2)
0.85xV
DD
Vhys
Schmitt trigger voltage hysteresis 3)
2.5
VOL
Output low level voltage 4)
VDD=5V
IIO=+2mA
0.28
0.45
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 or
internal reset sources
20
30
4210)
s
th(RSTL)in External reset pulse hold time
5)
2.5
s
tg(RSTL)in Filtered glitch duration
6)
100
ns
RESE T
ST72XXX
0.1
F
VDD
0.1
F
EXTERNAL
RESET
CIRCUIT
8)
R
EQ
U
IRE
D
IF
LV
D
USER
PULSE
GENERATOR
Filter
RON
VDD
WATCHDOG
LVD RESET
INTERNAL
RESET
ISD
ISABL
E
D
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