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參數(shù)資料
| 型號(hào)： | MAX6321HP |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5-Pin レP Supervisory Circuits with Watchdog and Manual Reset |
| 中文描述： | 5引腳レP監(jiān)控電路，帶有看門(mén)狗和手動(dòng)復(fù)位 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | MAX6321HP |
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M
5-Pin μP S upervisory Circ uits with
Watc hdog and Manual Reset
10
______________________________________________________________________________________
Applic ations Information
Watc hdog Input Current
The WDI input is internally driven through a buffer and
series resistor from the watchdog counter. For minimum
watchdog input current (minimum overall power con-
sumption), leave WDI low for the majority of the watch-
dog timeout period. When high, WDI can draw as much
as 160μA. Pulsing WDI high at a low duty cycle will
reduce the effect of the large input current. When WDI
is left unconnected, the watchdog timer is serviced
within the watchdog timeout period by a low-high-low
pulse from the counter chain.
Negative-Going V
CC
T ransients
These supervisors are immune to short-duration, nega-
tive-going V
CC
transients (glitches), which usually do
not require the entire system to shut down. Typically,
200ns large-amplitude pulses (from ground to V
CC
) on
the supply will not cause a reset. Lower amplitude puls-
es result in greater immunity. Typically, a V
CC
transient
that goes 100mV under the reset threshold and lasts
less than 4μs will not trigger a reset. An optional 0.1μF
bypass capacitor mounted close to V
CC
provides addi-
tional transient immunity.
Ensuring V alid Reset Outputs
Down to V
CC
= 0
The MAX6316_/MAX6317H/MAX6318_H/MAX6319_H/
MAX6321HP/MAX6322HP are guaranteed to operate
properly down to V
CC
= 1V. In applications that require
valid reset levels down to V
CC
= 0, a pull-down resistor
to active-low outputs (push/pull and bidirectional only,
Figure 8) and a pull-up resistor to active-high outputs
(push/pull only, Figure 9) will ensure that the reset line
is valid while the reset output can no longer sink or
source current. This scheme does not work with the
open-drain outputs of the MAX6320/MAX6321/MAX6322.
The resistor value used is not critical, but it must be
large enough not to load the reset output when V
CC
is
above the reset threshold. For most applications,
100k
is adequate.
Watc hdog S oftware Considerations
(MAX 6316/MAX 6317/MAX 6318/
MAX 6320/MAX 6321)
One way to help the watchdog timer monitor software
execution more closely is to set and reset 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 continue to be reset inside the
loop, keeping the watchdog from timing out.
V
CC
t
WD
t
RP
t
RP
t
RST
WDI
RESET
MAX6316/MAX6317
MAX6318/MAX6320
MAX6321
Figure 7. Watchdog Timing Relationship
GND
*THIS SCHEMATIC DOES NOT WORK ON THE OPEN-DRAIN
OUTPUTS OF THE MAX6321/MAX6322.
100k
V
CC
V
CC
RESET
MAX6317
MAX6318
MAX6319
MAX6321*
MAX6322*
Figure 9. Ensuring RESET Valid to V
CC
= 0 on Active-High
Push/Pull Outputs
GND
100k
V
CC
V
CC
RESET
MAX6316
MAX6318
MAX6319
Figure 8. Ensuring
RESET
Valid to V
CC
= 0 on Active-Low
Push/Pull and Bidirectional Outputs
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6321HPUK25AW | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
| MAX6321HPUK25AW+T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX6321HPUK25AW-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX6321HPUK25AX | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6321HPUK25AX+T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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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