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)： 1/20頁(yè)
文件大?。?/td> 198K
代理商： MAX791
M
Mic roproc essor S upervisory Circ uit
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
19-0075; Rev. 5; 7/95
_____________________
General Desc ription
The MAX791 microprocessor (μP) supervisory circuit
reduces the complexity and number of components need-
ed to monitor power-supply and battery-control functions
in μP systems. The 50μA supply current makes the
MAX791 ideal for use in portable equipment, while the 6ns
chip-enable propagation delay and 250mA output capa-
bility (25mA in battery-backup mode) make it suitable for
larger, higher-performance equipment.
The MAX791 comes in 16-pin DIP and narrow SO pack-
1) μP reset—–————output is asserted during power-up,
power-down, and brownout conditions, and is guaran-
teed to be in the correct state for V
CC
down to 1V,
even with no battery in the circuit.
2) Manual-reset input.
3) A 1.25V threshold detector provides for power-fail
warning and low-battery detection, or monitors a
power supply other than +5V.
4) Two-stage power-fail warning—a separate low-line
comparator compares V
CC
to a threshold 150mV
above the reset threshold.
5) Backup-battery switchover for CMOS RAM, real-time
clocks, μPs, or other low-power logic.
6) Software monitoring of backup-battery voltage.
7) A watchdog-fault output is asserted if the watchdog
input has not been toggled within either a preset or
an adjustable timeout period.
8) Write protection of CMOS RAM or EEPROM.
9) impending–W——Oassertion caused by watchdog timeout.
________________________Applic ations
Computers
Critical μP Power Monitoring
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
____________________________Features
o
Precision 4.65V Voltage Monitoring
o
200ms Power-OK/Reset Time Delay
o
Independent Watchdog Timer—Preset or Adjustable
o
1μA Standby Current
o
Power Switching
250mA Output in V
CC
Mode
25mA Output in Battery-Backup Mode
o
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
o
MaxCap
‰
or SuperCap
‰
Compatible
o
Voltage Monitor for Power-Fail or Low-Battery Warning
o
Backup-Battery Monitor
o
Guaranteed –R————–Valid to V
CC
= 1V
______________Ordering Information
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
WDPO
RESET
WDO
CE IN
GND
V
CC
V
OUT
VBATT
TOP VIEW
MAX791
CE OUT
WDI
LOWLINE
MR
SWT
PFI
PFO
BATT ON
DIP/SO
CMOS
RAM
MAX791
RESET
LOWLINE
WDI
CE IN
CE OUT
+5V
OTHER SYSTEM
RESET SOURCES
+12V
V
OUT
VBATT
*MaxCap
A0–P
MR
+12V SUPPLY
FAILURE
BATT
ON
SWT
ADDRESS
DECODE
0.1
μ
F
0.1
μ
F
0.47F*
V
CC
PFI
PFO
GND
I/O
NMI
INT
RESET
WDO
__________________Pin Configuration
__________Typic al Operating Circ uit
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 CERDIP
16 CERDIP
MAX791CPE
MAX791CSE
MAX791C/D
MAX791EPE
MAX791ESE
MAX791EJ E
MAX791MJ E
*Dice are specified at T
A
= +25°C.
MaxCap is a registered trademark of The Carborundum Corp.
SuperCap is a registered trademark of Baknor Industries.
相關(guān)PDF資料
PDF描述
MAX792R Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門限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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