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參數(shù)資料
| 型號： | MAX6746KA29 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | UP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay |
| 中文描述： | 復(fù)位電路的電容可調(diào)的復(fù)位/看門狗超時周期 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 187K |
| 代理商： | MAX6746KA29 |
M
Applications Information
Selecting Reset/Watchdog
Timeout Capacitor
The reset timeout period is adjustable to accommodate
a variety of μP applications. Adjust the reset timeout
period (t
RP
) by connecting a capacitor (C
SRT
) between
SRT and ground. Calculate the reset timeout capacitor
as folllows:
C
SRT
= t
RP
/ (5.06 x 10
6
),
with t
RP
in seconds and C
SRT
in Farads.
The watchdog timeout period is adjustable to accom-
modate a variety of μP applications. With this feature,
the watchdog timeout can be optimized for software
execution. The programmer can determine how often
the watchdog timer should be serviced. Adjust the
watchdog timeout period (t
WD
) by connecting a specif-
ic value capacitor (C
SWT
) between SWT and GND. For
normal mode operation, calculate the watchdog time-
out capacitor as follows:
C
SWT
= t
WD
/(5.06 x 10
6
),
with t
RP
in seconds and C
SRT
in Farads.
For the MAX6752 and MAX6753 windowed watchdog
function, calculate the slow watchdog period, t
WD2
as
follows:
t
WD2
= 0.65 x 10
9
x C
SWT
C
SRT
and C
SWT
must be a low-leakage (<10nA) type
capacitor. Ceramic capacitors are recommended.
Transient Immunity
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these supervi-
sors are relatively immune to short-duration supply tran-
sients (glitches). The Maximum Transient Duration vs.
Reset Threshold Overdrive graph in the
Typical
Operating Characteristics
shows this relationship.
The area below the curves of the graph is the region
in which these devices typically do not generate a reset
pulse. This graph was generated using a falling pulse
applied to V
CC
, starting above the actual reset threshold
(V
TH
) and ending below it by the magnitude indicated
(reset-threshold overdrive). As the magnitude of the tran-
sient increases (farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, a
V
CC
transient that goes 100mV below the reset threshold
and lasts 50μs or less does not cause a reset pulse to be
issued.
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
10
______________________________________________________________________________________
MAX6747
MAX6749
MAX6451
MAX6753
GND
N
RESET
RESET
5V
V
CC
V
CC
GND
3.3V
μ
P
100k
Figure 6. Interfacing to Other Voltage Levels
WDI
(a) FAST FAULT
(b) SLOW FAULT
WDI
RESET
(c) NORMAL OPERATION (NO PULSING, OUTPUT STAYS HIGH)
RESET
WDI
RESET
t
WDI
< t
WD1
(MIN)
t
WDI
> t
WD2
(MAX)
t
WD1
(MAX) < t
WDI
< t
WD2
(MIN)
Figure
5. MAX6752/MAX6753 Window Watchdog Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6746KA29/V+T | 功能描述:監(jiān)控電路 Microprocessor Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout delay 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 |
| MAX6746KA29+T | 功能描述:監(jiān)控電路 Single uPower Supervisor 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 |
| MAX6746KA29+TG48 | 制造商:Maxim Integrated Products 功能描述:?P RESET CIRCUITS WITH CAPACITOR-ADJUSTABLE RESET/WATCHDOG T - Tape and Reel |
| MAX6746KA29-T | 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 |
| MAX6746KA29-TG48 | 制造商:Maxim Integrated Products 功能描述:?P RESET CIRCUITS WITH CAPACITOR-ADJUSTABLE RESET/WATCHDOG T - Tape and Reel |
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