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參數(shù)資料
| 型號(hào)： | 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(dòng)復(fù)位安裝周期 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 261K |
| 代理商： | MAX6443US__L-T |
M
μP Reset Circuits with Long Manual Reset
Setup Period
_______________________________________________________________________________________
7
Applications Information
Interrupt Before Reset
To minimize data loss and speed system recovery,
many applications interrupt the processor or reset only
portions of the system before a processor hard reset is
asserted. The extended setup time of the MAX6443
–
MAX6452 manual reset inputs allows the same push-
button (connected to both the processor interrupt and
the extended
MR1
input, as shown in Figure 6) to con-
trol both the interrupt and hard reset functions. If the
pushbutton is closed for less than 6.72s, the processor
is only interrupted. If the system still does not respond
properly, the pushbutton (or two buttons for the dual
manual reset) can be closed for the full extended setup
period to hard reset the processor. If desired, connect
an LED to the
RESET
output to blink off (or on) for the
reset timeout period to signify when the pushbutton is
closed long enough for a hard reset (the same LED
might be used as the front-panel power-on display).
Smart Card Insertion/Removal
The MAX6447/MAX6448/MAX6451/MAX6452 dual manu-
al resets are useful in applications in which both an
extended and immediate setup periods are needed.
Figure 7 illustrates the insertion and removal of a smart
card.
MR1
monitors a front-panel pushbutton. When
closed for 6.72s,
RESET
one-shot pulses low for 140ms
min. Because
MR1
is internally pulled to V
CC
through a
50k
resistor, the front-panel switch can be connected to
MR2
RESET
t = 210ms
t < 210ms
COUNTER RESET
Figure 3. MAX6447/MAX6448/MAX6451/MAX6452 MR2
Assertion DebouncingTiming Diagram
MR2
RESET
210ms
DEBOUNCING PERIOD
210ms
TIMEOUT PERIOD
POSITIVE EDGE
NO RESET
OUTPUT
ASSERTED
Figure 4. MAX6447/MAX6448/MAX6451/MAX6452 MR2
Deassertion Debouncing Timing Diagram
MAX6449
MAX6451
RSTIN
V
CC
R1
R2
RESET
GND
V
MON_TH
= 0.63 x (R1 + R2) / R2
V
MON_TH
V
CC
Figure 5. Calculating the Monitored Threshold Voltages
MAX6443
μ
P
V
CC
RESET
V
CC
+3.3V
NMI
LED
RESET
MR1
GND
PUSHBUTTON SWITCH:
CLOSE FOR < 4.48s
FOR SYSTEM INTERRUPT;
CLOSE FOR > 6.72s FOR
SYSTEM RESET
Figure 6. Interrupt Before Reset Application Circuit
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| MAX6444US16K+T | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH LONG MANUAL RESET SETUP P - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MPU RESET SOT143-4 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits Microprocessor Reset Circuit |
| MAX6444US16L | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
| MAX6444US16L+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.58V 7UA 4PIN SOT-143 - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6444US16L+T | 功能描述:監(jiān)控電路 Single 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(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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