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參數(shù)資料
| 型號： | MAX6451UT22L-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | µP Reset Circuits with Long Manual Reset Setup Period |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | ROHS COMPLIANT, SOT-23, 6 PIN |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 158K |
| 代理商： | MAX6451UT22L-T |
MAX6443–MAX6452
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 P 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 VCC 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 VCC
decreases toward 1V, so does the IC’s ability to sink
current at RESET. RESET is pulled high as VCC 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
VCC = 0V (Push-Pull RESET)
When VCC 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 Ps and other circuitry
do not operate with VCC 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 P 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.
P Reset Circuits with Long Manual Reset
Setup Period
8
_______________________________________________________________________________________
MAX6451
P
VCC
RSTIN
RESET
DIGITAL INPUT
I/O SUPPLY
CORE SUPPLY
+3.3V
+1.5V
RESET
MR1
MR2
GND
FRONT-PANEL SWITCH
STANDARD
P INPUT
AND tMR MANUAL
RESET DELAY
SMART CARD DETECT:
IMMEDIATE ONE-SHOT
WHEN MANUAL
RESET CLOSES
Figure 7. MAX6451/MAX6452 Application Circuit
MAX6444
MAX6446
MAX6448
MAX6450
MAX6452
P
RESET
GND
VCC
5V
3.3V
100k
N
Figure 8. Interfacing to Other Voltage Levels
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6451UT23L | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Cut Tape Product |
| MAX6451UT23L+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 7UA 6PIN SOT-23 - Cut Tape Product |
| MAX6451UT23L+T | 功能描述:監(jiān)控電路 Dual 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 |
| MAX6451UT23L-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 |
| MAX6451UT26L | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Cut Tape Product |
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