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參數(shù)資料
| 型號： | MAX791 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor Supervisory Circuit(微處理器監(jiān)控電路) |
| 中文描述： | 微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 198K |
| 代理商： | MAX791 |
M
Mic roproc essor S upervisory Circ uit
_______________________________________________________________________________________
7
______________________________________________________________Pin Desc ription
PIN
NAME
FUNCTION
1
VBATT
2
V
OUT
Output Supply Voltage. V
OUT
connects to V
CC
when V
CC
is greater than VBATT and V
CC
is above the reset
threshold. When V
CC
falls below VBATT and V
CC
is below the reset threshold, V
OUT
connects to VBATT.
Connect a 0.1μF capacitor from V
OUT
to GND.
3
V
CC
Input Supply Voltage—+5V input
4
GND
5
BATT ON
6
–——O
7
PFI
8
SWT
9
–M—–
10
–—O—W——
—N—
11
WDI
12
–—OUT
Chip-Enable Output. –— OUT goes low only when –—IN is low and V
is above the reset threshold. If –—IN is
low when reset is asserted, –—OUT will stay low for 15μs or until –—IN goes high, whichever occurs first.
13
–—IN
Backup-Battery Input. Connect to external battery or capacitor and charging circuit.
Ground. 0V reference for all signals
Battery On Output. Goes high when V
OUT
switches to VBATT. Goes low when V
OUT
switches to V
CC
. Connect
the base of a PNP through a current-limiting resistor to BATT ON for V
OUT
current requirements greater than
250mA.
Power-Fail Output. This is the output of the power-fail comparator. –——Ogoes low when PFI is less than 1.25V.
This is an uncommitted comparator, and has no effect on any other internal circuitry.
Power-Fail Input. This is the noninverting input to the power-fail comparator. When PFI is less than 1.25V,
OUT
when not used.
Set Watchdog-Timeout Input. Connect this input to V
OUT
to select the default 1.6sec watchdog timeout period.
Connect a capacitor between this input and GND to select another watchdog-timeout period. Watchdog-timeout
period = 2.1 x (capacitor value in nF) ms.
16
–W———O
15
–————
14
–W——O
Manual-Reset Input. This input can be tied to an external momentary pushbutton switch, or to a logic gate out-
–—O—W——
erate an NMI if the unregulated supply is inaccessible.
—N—Output goes low when V
CC
falls to 150mV above the reset threshold. The output can be used to gen-
Watchdog Input. WDI is a three-level input. If WDI remains either high or low for longer than the watchdog time-
the watchdog function. WDI connects to an internal voltage divider between V
OUT
and GND, which sets it to mid-
supply when left unconnected.
Chip-Enable Input. The input to chip-enable gating circuit. Connect to GND or V
OUT
if not used.
Watchdog Output. –W——Ogoes low if WDI remains either high or low longer than the watchdog timeout period.
–W——Oreturns high on the next transition at WDI. –W——Oremains high if WDI is unconnected. –W——Ois also high
when –————is asserted.
–————Output goes low whenever V
CC
falls below the reset threshold. –————will remain low for typically 200ms
after V
CC
crosses the reset threshold on power-up.
Watchdog-Pulse Output. Upon the absence of a transition at WDI, –W———Owill pulse low for a minimum of 1ms.
–W———Oprecedes –W——O by 70ns.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX791C/D | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX791CPE | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX791CPE+ | 功能描述:監(jiān)控電路 MPU 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX791CSE | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX791CSE+ | 功能描述:監(jiān)控電路 MPU 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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