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參數(shù)資料
| 型號： | MAX794 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 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) |
| 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)： | 7/20頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX794 |
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
_______________________________________________________________________________________
7
______________________________________________________________Pin Desc ription
PIN
Supply Output for CMOS RAM. When V
CC
rises above the reset threshold or above
V
BATT
, OUT is connected to V
CC
through an internal P-channel MOSFET switch. When
V
CC
falls below V
SW
and V
BATT
, BATT connects to OUT.
Main Supply Input
OUT
1
1
Reset Input. Connect to an external resistor divider to select the reset threshold. The
reset threshold can be programmed anywhere in the V
SW
to 5.5V range.
RESET IN
(MAX794)
3
—
Battery Status Output. High in normal operating mode when V
BATT
exceeds V
BOK
, other-
wise low. V
BATT
is checked continuously. Disabled and logic low while V
CC
is below V
SW
.
BATT OK
(MAX793)
V
CC
2
2
Power-Fail Comparator Output. When PFI is less than V
PFT
or when V
CC
falls below
V
SW
, PFO goes low; otherwise, PFO remains high. PFO is also used to enable the bat-
tery freshness seal (see Battery Freshness Seal and Power-Fail Comparatorsections).
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as
MR is low and for 200ms after MR returns high. The active-low input has an internal
70μA pull-up current. In can be driven from a TTL- or CMOS-logic line or shorted to
ground with a switch. Leave open if unused.
PFO
7
—
Active-High Reset Output. Sources and sinks current. RESET is the inverse of RESET.
RESET
13
Chip-Enable Output. CE OUT goes low only when CE IN is low and reset is not asserted.
If CE IN is low when reset is asserted, CE OUT will remain low for 10μs or until CE IN
goes high, whichever occurs first. CE OUT is pulled up to OUT.
CE OUT
12
—
6
Ground
GND
6
Power-Fail Comparator Input. When PFI is less than V
PFT
or when V
CC
falls below V
SW
,
PFO goes low; otherwise, PFO remains high (see Power-Fail Comparatorsection).
Connect to V
CC
if unused.
Logic Output/External Bypass Switch-Driver Output. High when OUT switches to BATT.
Low when OUT switches to V
CC
. Connect the base/gate of PNP/PMOS transistor to
BATT ON for I
OUT
requirements exceeding 75mA.
PFI
4
Chip-Enable Input. The input to the chip-enable gating circuit. Connect to GND if unused
CE IN
11
5
4
—
Watchdog Output. WDO goes low if WDI remains either high or low for longer than the
watchdog timeout period. WDO returns high on the next transition of WDI. WDO is a
logic high for V
SW
< V
CC
< V
RST
, and low when V
CC
is below V
SW
.
Watchdog Input. If WDI remains either high or low for longer than the watchdog timeout
period, the internal watchdog timer runs out and WDO goes low. WDO returns high on
the next transition of WDI. Connect WDO to MR to generate a reset due to a watchdog
fault.
WDO
9
—
MR
8
—
WDI
10
—
Early Power-Fail Warning Output. Low when V
CC
falls to V
LR
. This output can be used to
generate an NMI to provide early warning of imminent power-failure.
LOWLINE
14
—
Open-Drain, Active-Low Reset Output. Pulses low for 200ms when triggered, and stays
low whenever V
CC
is below the reset threshold or when MR is a logic low. It remains low
for 200ms after either V
CC
rises above the reset threshold, the watchdog triggers a reset
(WDO connected to MR), or MR goes low to high.
Backup-Battery Input. When V
CC
falls below V
SW
and V
BATT
, OUT switches from V
CC
to
BATT. When V
CC
rises above the reset threshold or above V
BATT
, OUT reconnects to
V
CC
. V
BATT
may exceed V
CC
. Connect V
CC
, OUT, and BATT together if no battery is
used.
RESET
15
7
BATT
16
8
BATT ON
5
3
MAX793/
MAX794
FUNCTION
NAME
MAX795
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX794CPE | 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 |
| MAX794CPE+ | 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 |
| MAX794CSE | 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 |
| MAX794CSE+ | 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 |
| MAX794CSE+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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