參數(shù)資料
型號(hào)： 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(yè)數(shù)： 8/20頁(yè)
文件大小： 198K
代理商： MAX791
_______________Detailed Desc ription
Manual Reset Input
Many μP-based products require manual-reset capabil-
ity, allowing the operator or test technician to initiate a
reset. The Manual Reset Input (MR) can be connected
directly to a switch, without an external pull-up resistor
or debouncing network. It connects to a 1.25V com-
parator, and has a pull-up to V
OUT
as shown in Figure
1. The propagation delay from asserting MR to RESET
asserted is 4μs typical. Pulsing MR low for a minimum
of 15μs resets all the internal counters, sets the
Watchdog Output (WDO) and Watchdog-Pulse Output
(WDPO) high, and sets the Set Watchdog-Timeout
(SWT) input to V
OUT
- 0.6V, if it is not already connect-
ed to V
OUT
(for internal timeouts). It also disables the
chip-enable function, setting the Chip-Enable Output
(CE OUT) to a high state. The RESET output remains
active as long as MR is held low, and the reset-timeout
period begins after MR returns high (Figure 2).
Use this input as either a digital-logic input or a second
low-line comparator. Normal TTL/CMOS levels can be
wire-OR connected via pull-down diodes (Figure 3),
and open-drain/collector outputs can be wire-ORed
directly.
M
Mic roproc essor S upervisory Circ uit
8
_______________________________________________________________________________________
MAX791
CHIP-ENABLE
OUTPUT
CONTROL
V
CC
3
1
13
9
8
11
7
VBATT
CE IN
MR
SWT
WDI
PFI
RESET
GENERATION
TIMEBASE FOR
RESET AND
WATCHDOG
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
V
OUT
1.25V
GND
4
4.65V
150mV
10
LOWLINE
5
2
12
15
16
14
PFO
WDO
WDPO
RESET
CE OUT
6
V
OUT
BATT ON
Figure 1. Block Diagram
MR
RESET
CE IN
0V
7.5
μ
s TYP
15
μ
s TYP
25
μ
s MIN
CE OUT
Figure 2. Manual-Reset Timing Diagram
MAX791
*
*
OTHER
RESET
SOURCES
MANUAL RESET
MR
* DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
Figure 3. Diode "OR"connections allow multiple reset sources
相關(guān)PDF資料
PDF描述
MAX792R Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門(mén)限2.61V,微處理器和非易失存儲(chǔ)器監(jiān)控電路)
MAX792S Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門(mén)限1.91V,微處理器和非易失存儲(chǔ)器監(jiān)控電路)
MAX792T Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門(mén)限3.06V,微處理器和非易失存儲(chǔ)器監(jiān)控電路)
MAX793 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有監(jiān)控器、芯片使能和支持備用電池的復(fù)位器)
MAX794 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有可調(diào)閾值監(jiān)控器、芯片使能和支持備用電池的復(fù)位器)
相關(guān)代理商/技術(shù)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(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
MAX791CPE 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
MAX791CPE+ 功能描述:監(jiān)控電路 MPU Supervisor 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
MAX791CSE 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
MAX791CSE+ 功能描述:監(jiān)控電路 MPU Supervisor 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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