參數(shù)資料
型號(hào)： MAX6444US__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(zhǎng)手動(dòng)復(fù)位安裝周期
文件頁(yè)數(shù)： 8/13頁(yè)
文件大?。?/td> 261K
代理商： MAX6444US__L-T
M
a microprocessor for general-purpose I/O control. MR2
monitors a switch to detect when a smart card is inserted.
When the switch is closed high (card inserted),
RESET
one-shot pulses low for 140ms. MR2 is internally
debounced for 210ms to prevent false resets when the
smart card is removed.
Interfacing to Other Voltages
for Logic Compatibility
The open-drain
RESET
output can be used to interface
to a μP with other logic levels. As shown in Figure 8, the
open-drain output can be connected to voltages from 0
to 6V.
Generally, the pullup resistor connected to the
RESET
connects to the supply voltage that is being monitored
at the IC
’
s V
CC
pin. However, some systems may use
the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
(Figure 8). Keep in mind that as the supervisor
’
s V
CC
decreases toward 1V, so does the IC
’
s ability to sink
current at
RESET
.
RESET
is pulled high as V
CC
decays
toward 0. The voltage where this occurs depends on
the pullup resistor value and the voltage to which it is
connected.
Ensuring a Valid
RESET
Down to
V
CC
= 0V (Push-Pull
RESET
)
When V
CC
falls below 1V,
RESET
current-sinking capa-
bilities decline drastically. The high-impedance CMOS-
logic inputs connected to
RESET
can drift to
undetermined voltages. This presents no problems in
most applications, because most μPs and other circuitry
do not operate with V
CC
below 1V.
In applications in which
RESET
must be valid down to
0V, add a pulldown resistor between
RESET
and GND
for the push-pull outputs. The resistor sinks any stray
leakage currents, holding
RESET
low (Figure 9). The
value of the pulldown resistor is not critical; 100k
is
large enough not to load
RESET
and small enough to
pull
RESET
to ground. The external pulldown cannot be
used with the open-drain reset outputs.
Transient Immunity
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these supervi-
sors are relatively immune to short-duration falling tran-
sients (glitches). The graph Maximum Transient Duration
vs. Reset Threshold Overdrive in the
Typical Operating
Characteristics
section shows this relationship.
μP Reset Circuits with Long Manual Reset
Setup Period
8
_______________________________________________________________________________________
MAX6451
μ
P
V
CC
RSTIN
RESET
DIGITAL INPUT
I/O SUPPLY
CORE SUPPLY
+3.3V
+1.5V
RESET
MR1
MR2
GND
FRONT-PANEL SWITCH
STANDARD
μ
P INPUT
AND 6.72s MANUAL
RESET DELAY
SMART CARD DETECT:
IMMEDIATE ONE-SHOT
WHEN MANUAL
RESET CLOSES
Figure 7. MAX6451/MAX6452 Application Circuit
MAX6444
MAX6446
MAX6448
MAX6450
MAX6452
μ
P
RESET
RESET
GND
V
CC
5V
3.3V
100k
N
Figure 8. Interfacing to Other Voltage Levels
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6445UK16L 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Rail/Tube
MAX6445UK16L+ 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.58V 7UA 5PIN SOT-23 - Rail/Tube
MAX6445UK16L+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(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
MAX6445UK16L-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
MAX6445UK17L 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Rail/Tube
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