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參數(shù)資料
| 型號： | MAX793 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 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) |
| 中文描述： | 3.0V/3.3V可調(diào)、微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX793 |
M
____________________________Erratum
Initial versions of the MAX793 and MAX794 have a
logic design error that can cause the loss of output volt-
age (OUT) when V
CC
is absent even though a backup
battery is connected to the BATT input. Applications
that do not use the MR input (including all MAX795
applications) are unaffected by this phenomenon.
Also, applications that do not use PFO are unaffected if
PFI is tied to V
CC
.
The loss of output voltage is caused by the IC incor-
rectly entering the battery “freshness seal” mode.
Normally, freshness seal mode is activated by ground-
ing PFO during a power-up reset timeout period. Then,
the removal of V
CC
powers the IC down without con-
necting the backup battery to OUT.
The IC decides whether or not to enter freshness seal
mode during all reset timeout periods. During a power-
up reset timeout period (which occurs when V
CC
is
raised above the MAX793’s reset threshold or the volt-
age on the MAX794’s RESET IN pin is raised above the
RESET IN threshold), the IC momentarily disconnects
the PFO pin from the comparator output and lightly
pulls PFO up to V
CC
. The voltage level on the PFO pin
is then tested and, if it is low, freshness seal mode is
chosen. (PFO is reconnected to the comparator output
before the end of the reset timeout period.)
However, when a reset is initiated by MR, the PFO pin
incorrectly remains connected to the comparator output
during the entire timeout period and is not pulled up. If
the comparator is driving PFO low during an MR reset
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
16
______________________________________________________________________________________
MAX793
MAX794
MAX795
3.0V OR 3.3V
TOCMOS RAM
BODY DIODE
GND
MAX793
MAX794
MAX795
BATT ON
V
CC
OUT
S
D
G
PMOS FET
BATT ON
V
CC
OUT
GND
(b)
(a)
Figure 14. Driving an External Transistor with BATT ON
MAX793
MAX794
OUT
TOSTATIC
RAM
BATT
V
CC
GND
1N4148
RESET
TO
μ
P
0.47F
3.0V OR 3.3V
MAX793
MAX794
OUT
TOSTATIC
RAM
BATT
V
CC
V
CC
GND
1N4148
RESET
TO
μ
P
0.47F
3.0V OR
3.3V
+5V
(b)
(a)
V
CC
Figure 15. Using a SuperCap as a Backup Source
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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) |
| MAX796 | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
| MAX797 | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
| MAX797CPE | Octal Bus Transceivers With 3-State Outputs 20-CDIP -55 to 125 |
| MAX796-MAX799 | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX793RCPE | 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 |
| MAX793RCPE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV 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(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 |
| MAX793RCSE | 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 |
| MAX793RCSE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV 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(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 |
| MAX793RCSE+T | 功能描述:監(jiān)控電路 3/3.3/AdjV 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(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 |
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