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參數(shù)資料
| 型號： | MAX6443US__L-T |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | レP Reset Circuits with Long Manual Reset Setup Period |
| 中文描述： | レP復(fù)位電路，帶有長手動復(fù)位安裝周期 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 261K |
| 代理商： | MAX6443US__L-T |
M
μP Reset Circuits with Long Manual Reset
Setup Period
6
_______________________________________________________________________________________
Manual Reset Input Options
Unlike typical manual reset functions associated with
supervisors, each device in the MAX6443
–
MAX6452
family includes at least one manual reset input, which
must be held logic-low for an extended setup period
(6.72s typ) before the
RESET
output asserts. When
valid manual reset input conditions/setup periods are
met, the
RESET
output is one-shot pulse asserted low
for a fixed reset timeout period (140ms min). Existing
front-panel pushbutton switches (i.e., power on/off,
channel up/down, or mode select) can be used to drive
the manual reset inputs. The extended manual reset
setup period prevents nuisance system resets during
normal front-panel usage or resulting from inadvertent
short-term pushbutton closure.
The MAX6443/MAX6444, MAX6447/MAX6448, and
MAX6451/MAX6452 include a single manual reset input
with extended setup period (
MR1
). The MAX6445/
MAX6446 and MAX6449/MAX6450 include two manual
reset inputs (
MR1
and
MR2
) with extended setup peri-
ods. For dual
MR1
,
MR2
devices, both inputs must be
held low simultaneously for the extended setup period
(6.72s typ) before the reset output is pulse asserted.
The dual extended setup provides greater protection
from nuisance resets. (For example, the user or service
technician is informed to simultaneously push both the
on/off button and the channel-select button for 6.72s to
reset the system.)
The MAX6443
–
MAX6452
RESET
output is pulse asserted
once for the reset timeout period after each valid manual
reset input condition. At least one manual reset input
must be released (go high) and then be driven low for the
extended setup period before
RESET
asserts again.
Internal timing circuitry debounces low-to-high manual
reset logic transitions, so no external circuitry is required.
Figure 1 illustrates the single manual reset function of the
MAX6443/MAX6444 single-voltage monitors, and Figure
2 represents the dual manual reset function of the
MAX6445/MAX6446 and MAX6449/MAX6450.
The MAX6447/MAX6448 and MAX6451/MAX6452
include both an extended setup period and immediate
setup period manual reset inputs. A low-to-high MR2
rising edge transition immediately pulse asserts the
RESET
output for the reset timeout period (140ms min).
If the MAX6447/MAX6448 and MAX6451/MAX6452
MR2 input senses another rising edge before the end
of the 140ms timeout period (Figure 3), the internal
timer clears and begins counting again. If no rising
edges are detected within the 210ms timeout period,
RESET
deasserts. The high-to-low transition on MR2
input is internally debounced for 210ms to ensure that
there are no false
RESET
assertions when MR2 is dri-
ven from high to low (Figure 4). The MR2 input can be
used for system test purposes or smart-card-detect
applications (see the
Applications Information
section).
Adjustable Input Voltage (RSTIN)
The MAX6449
–
MAX6452 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage-divider (Figure 5). Use the following for-
mula to calculate the externally monitored voltage
(V
MON-TH
):
V
MON-TH
= V
TH-RSTIN
(R1+ R2) / R2
where V
MON-TH
is the desired reset threshold voltage
and V
TH-RSTIN
is the reset input threshold (0.63V).
Resistors R1 and R2 can have very high values to mini-
mize current consumption because of low leakage cur-
rents. Set R2 to some conveniently high value (250k
,
for example), and calculate R1 based on the desired
reset threshold voltage, using the following formula:
R1 = R2
(V
MON-TH
/ V
TH-RSTIN
- 1)
RESET TIMEOUT PERIOD
210ms
MR1 SETUP PERIOD
6.72s
MR1
RESET
Figure 1. MAX6443/MAX6444 Manual Reset Timing Diagram
MR2
RESET
MR1
6.72s
210ms
Figure 2. MAX6445/MAX6446/MAX6449/MAX64450 Manual
Reset Timing Diagram
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| MAX6444US16L+T | 功能描述:監(jiān)控電路 Single uPower Reset Circuit 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 |
| MAX6444US16L-T | 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 |
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