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參數(shù)資料
| 型號(hào)： | MAX6454UTS-T |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | uP Supervisors with Separate VCC Reset and Manual Reset Outputs |
| 中文描述： | 監(jiān)事的uP與單獨(dú)的VCC復(fù)位輸出和手動(dòng)復(fù)位 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 189K |
| 代理商： | MAX6454UTS-T |
M
μP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
6
_______________________________________________________________________________________
Detailed Description
Reset Output
The reset output is typically connected to the reset
input of a microprocessor (μP). A μP
’
s reset input starts
or restarts the μP in a known state. The MAX6453
–
MAX6456 μP supervisory circuits provide the reset
logic to prevent code-execution errors during power-
up, power-down and brownout conditions (see the
Typical Operating Circuit
).
RESET
changes from high to low whenever the moni-
tored voltage (RSTIN or V
CC
) drops below the reset
threshold voltages. When V
RSTIN
and V
CC
exceed their
respective reset threshold voltages,
RESET
remains low
for the reset timeout period, and then goes high.
RESET
changes from high to low after
MR
input is held low for
the 3.36s (typ) setup period and deasserts 140ms (min)
after
MR
deasserts.
RESET
is guaranteed to be in the proper output logic
state for V
CC
inputs
≥
1V. For applications requiring valid
reset logic when V
CC
is less than 1V, see the
Ensuring a
Valid
RESET
Output Down to V
CC
= 0V
section.
Manual Reset
The MAX6453/MAX6454 contain a manual reset output
(
MROUT
) that asserts low immediately after driving
MR
low and remains low for the reset timeout period after
MR
goes high (Figure 1). The pushbutton manual reset
has no effect on the
RESET
output.
MROUT
output can
be used to drive an NMI (nonmaskable interrupt) on the
processor to save valuable data.
The MAX6455/MAX6456
’
s
MROUT
is asserted immedi-
ately upon driving
MR
low. Driving
MR
low for longer
than the 3.36s (typ) setup period asserts
RESET
. When
MR
is deasserted,
MROUT
and
RESET
remain asserted
low for the reset timeout period after
MR
goes high
(Figure 2).
Adjustable Input Voltage (RSTIN)
The MAX6453
–
MAX6456 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage divider (Figure 3). 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 due to low leakage currents.
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
- 1)
210ms
MROUT
RESET
MR
LONG SETUP PERIOD, 3.36s
Figure 2. MAX6455/MAX6456 Timing Diagram
210ms
MROUT
MR
Figure 1. MAX6453/MAX6454 Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6455UT16S | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR SUPERVISORS WITH SEP - Cut Tape Product |
| MAX6455UT16S+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 7UA 6PIN SOT-23 - Rail/Tube |
| MAX6455UT16S+T | 功能描述:監(jiān)控電路 Dual uPower Reset Circuit 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(guò)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(kāi)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 |
| MAX6455UT16S-T | 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(guò)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(kāi)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 |
| MAX6455UT17S | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR SUPERVISORS WITH SEP - Rail/Tube |
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