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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 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 198K |
| 代理商： | MAX791 |
Battery-Bac kup Mode
The MAX791 requires two conditions to switch to bat-
tery-backup mode: 1) V
CC
must be below the reset
threshold; 2) V
CC
must be below VBATT. Table 1 lists
the status of the inputs and outputs in battery-backup
mode.
Battery On Output
The Battery On (BATT ON) output indicates the status
of the internal V
CC
/battery-switchover comparator,
which controls the internal V
CC
and VBATT switches.
For V
CC
greater that VBATT (ignoring the small hystere-
sis effect), BATT ON typically sinks 3.2mA at 0.1V satu-
ration voltage. In battery-backup mode, this terminal
sources approximately 10μA from V
OUT
. Use BATT ON
to indicate battery-switchover status or to supply base
drive to an external pass transistor for higher-current
applications (see Typical Operating Circuit.
Input S upply V oltage
The Input Supply Voltage (V
CC
) should be a regulated
+5V. V
CC
connects to V
OUT
via a parallel diode and a
large PMOS switch. The switch carries the entire cur-
rent load for currents less than 250mA. The parallel
diode carries any current in excess of 250mA. Both the
switch and the diode have impedances less than 1
each (Figure 10). The maximum continuous current is
250mA, but power-on transients may reach a maximum
of 1A.
Bac kup-Battery Input
The Backup-Battery Input (VBATT) is similar to V
CC
,
except the PMOS switch and parallel diode are much
smaller. Accordingly, the on-resistances of the diode
and the switch are each approximately 10
.
Continuous current should be limited to 25mA and
peak currents (only during power-up) limited to 250mA.
The reverse leakage of this input is less than 1μA over
temperature and supply voltage.
Output S upply V oltage
The Output Supply Voltage (V
OUT
) is internally connect-
ed to the substrate of the IC and supplies all the current
to the external system and internal circuitry. All open-
circuit outputs will, for example, assume the V
OUT
volt-
age in their high states rather than the V
CC
voltage. At
the maximum source current of 250mA, V
OUT
will typi-
cally be 200mV below V
CC
. Decouple this terminal with
a 0.1μF capacitor.
M
Mic roproc essor S upervisory Circ uit
______________________________________________________________________________________
13
200ms TYP
RESET
THRESHOLD
V
CC
RESET
CE IN
CE OUT
SECOND CE PULSE ABSENT WHEN VBATT < 2V
Figure 11. Backup-Battery Monitor Timing Diagram
MAX791
VBATT
V
CC
1
3
2
0.1
μ
F
V
OUT
Figure 10. V
CC
and VBATT-to-V
OUT
Switch
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 |
| 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 |
| 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 |
| 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 |
| 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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