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參數資料
| 型號： | MAX807_CPE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| 中文描述： | 全功能レP監(jiān)控電路與精度【1.5eset |
| 文件頁數： | 9/16頁 |
| 文件大小： | 116K |
| 代理商： | MAX807_CPE |
M
Full-Featured μP S upervisory Circ uit with
±1.5% Reset Ac c urac y
_______________________________________________________________________________________
9
The RESET output is active low and implemented with a
strong pull-down/relatively weak pull-up structure. It is
guaranteed to be a logic low for 0V < V
CC
< V
RST
, pro-
vided V
BATT
is greater than 2V. Without a backup bat-
tery, RESET is guaranteed valid for V
CC
≥
1. It typically
sinks 3.2mA at 0.1V saturation voltage in its active state.
The RESET output is the inverse of the RESET output; it
both sources and sinks current and cannot be wire-OR
connected.
Manual Reset Input
Many μP-based products require manual-reset capabil-
ity to allow an operator or test technician to initiate a
reset. The Manual Reset (MR) input permits the genera-
tion of a reset in response to a logic low from a switch,
WDO, or external circuitry. Reset remains asserted
while MR is low, and for 200ms after MR returns high.
MR has an internal 50μA to 200μA pull-up current, so it
can be left open if it is not used. MR can be driven with
TTL or CMOS-logic levels, or with open-drain/collector
outputs. Connect a normally open momentary switch
from MR to GND to create a manual-reset function;
external debounce circuitry is not required. If MR is dri-
ven from long cables or if the device is used in a noisy
environment, connect a 0.1μF capacitor from MR to
ground to provide additional noise immunity. As shown
in Figure 3, diode-ORed connections can be used to
allow manual resets from multiple sources. Figure 4
shows the reset timing.
Watc hdog T imer
Watchdog Input
The watchdog circuit monitors the μP’s activity. If the
μP does not toggle the watchdog input (WDI) within
1.6sec, WDO goes low. The internal 1.6sec timer is
cleared and WDO returns high when reset is asserted
or when a transition (low-to-high or high-to-low) occurs
at WDI while RESET is high. As long as reset is assert-
ed, the timer remains cleared and does not count. As
soon as reset is released, the timer starts counting
(Figure 5). Supply current is typically reduced by 10μA
when WDI is at a valid logic level.
V
RESET
V
LOW LINE
V
CC
V
RESET
V
CE OUT
V
RST
V
LL
t
RP
t
RP
V
BATT
SHOWN FOR V
CC
= 0V to 5V, V
BATT
= 2.8V, CE IN = GND
V
RESET
V
LOW LINE
V
CC
V
RESET
V
CE OUT
V
RST
V
RST
+ V
LR
V
BATT
SHOWN FOR V
CC
= 5V to 0V, V
BATT
= 2.8V, CE IN = GND
Figure 2a. Timing Diagram, V
CC
Rising
Figure 2b. Timing Diagram, V
CC
Falling
MAX807
*
*
OTHER
RESET
SOURCES
MANUAL RESET
MR
* DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
Figure 3. Diode “OR” connections allow multiple reset sources
to connect to MR.
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| MAX810SN293D2T1G | Rectifier Diodes; Mounting style: Surface mount; Package size: 2.9x1.6(t=1.0); Number of terminal: 5; Application: General Purpose Rectifier Diodes; Repetitive peak reverse voltage VRM(V): 400; Average rectified forward current IO(A): 0.5; |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX807L | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| MAX807LCPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCPE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCUE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCUE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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