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參數(shù)資料
| 型號： | MAX79C |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| 中文描述： | 3.0V/3.3V可調(diào)微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 150K |
| 代理商： | MAX79C |
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
______________________________________________________________________________________
19
___________________Chip Information
_________________Pin Configurations
CE IN
CE OUT
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
BATT
RESET
LOWLINE
RESET
PFI
(RESET IN) BATT OK
V
CC
OUT
TOP VIEW
MAX793
MAX794
CE OUT
CE IN
WDI
WDO
MR
PFO
GND
BATT ON
DIP / Narrow SO
1
2
3
4
8
7
6
5
BATT
GND
BATT ON
V
CC
OUT
MAX795
DIP/SO
RESET
( ) ARE FOR MAX794
TRANSISTOR COUNT: 1271
have without causing a reset pulse to be issued. As
the amplitude of the transient increases (i.e., goes far-
ther below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V
CC
transient that
goes 40mV below the reset threshold and lasts for
10μs or less will not cause a reset pulse to be issued.
A 0.1μF bypass capacitor mounted close to the V
CC
pin provides additional transient immunity.
Watc hdog S oftware Considerations
There is a way to help the watchdog timer monitor soft-
ware execution more closely, which involves setting
and resetting the watchdog input at different points in
the program rather than “pulsing” the watchdog input
high-low-high or low-high-low. This technique avoids a
“stuck” loop, in which the watchdog timer would con-
tinue to be reset within the loop, keeping the watchdog
from timing out. Figure 19 shows an example of a flow
diagram where the I/O driving the watchdog input is
set high at the beginning of the program, set low at the
beginning of every subroutine or loop, then set high
again when the program returns to the beginning. If
the program should “hang” in any subroutine, the prob-
lem would quickly be corrected, since the I/O is contin-
ually set low and the watchdog timer is allowed to time
out, causing a reset or interrupt to be issued.
_Ordering Information (c ontinued)
* The MAX793/MAX795 offer a choice of reset threshold voltage.
Select the letter corresponding to the desired reset threshold volt-
age range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R = 2.55V
to 2.70V) and insert it into the blank to complete the part number.
The MAX794’s reset threshold is adjustable.
16 Narrow SO
8 Plastic DIP
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
MAX794ESE
MAX795
_CPA
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
PIN-PACKAGE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
MAX794EPE
MAX794CSE
MAX794
CPE
PART*
8 SO
-40°C to +85°C
MAX795_ESA
8 Plastic DIP
8 SO
MAX795_EPA
MAX795_CSA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX79E | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| MAX794ESE | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
| MAX794CPE | Quadruple 2-Input Exclusive-OR Gates 14-CDIP -55 to 125 |
| MAX794CSE | Quadruple 2-Input Exclusive-OR Gates 14-CFP -55 to 125 |
| MAX794EPE | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
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| MAX800LCPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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