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参数资料
| 型号： | MAX6343LUT-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Analog IC |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | MINIATURE, SOT-23, 6 PIN |
| 文件页数： | 6/8页 |
| 文件大小： | 548K |
| 代理商： | MAX6343LUT-T |
MAX6342–MAX6345
Power-Fail Comparator
The power-fail comparator is useful for various purpos-
es because the power-fail output (PFO) is independent
of the reset output. The inverting input is internally con-
nected to a +1.25V reference.
To build an early-warning circuit for power failure, con-
nect the PFI pin to a voltage divider (see the Typical
Oper-ating Circuit). Choose the voltage-divider ratio so
that the voltage at PFI falls below +1.25V just before the
+5V regulator drops out. Use PFO to interrupt the P to
prepare for an orderly shutdown.
Applications Information
Negative-Going VCC Transients
The MAX6342–MAX6345 supervisors are immune to
short-duration, negative-going VCC transients (glitches)
that usually do not require the entire system to shut down.
Figure 4 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6342–MAX6345 do
not generate a reset pulse. The graph was generated
using a negative-going pulse applied to VCC, starting
0.5V above the actual reset threshold and ending below
it by the magnitude indicated (reset comparator over-
drive). The graph indicates the maximum pulse width a
negative-going VCC transient can have without causing
a reset pulse. As the magnitude of the transient increas-
es (goes further below the reset threshold), the maxi-
mum allowable pulse width decreases.
Typically, a VCC transient that goes 100mV below the
reset threshold and lasts 12s or less will not cause a
reset pulse. A 1F bypass capacitor mounted as close
as possible to the VCC pin provides additional transient
immunity.
Ensuring a Valid Reset Output
Down to VCC = 0
The MAX6342–MAX6345 are guaranteed to operate
properly down to VCC = +1V. In applications that require
valid reset levels down to VCC = 0, a pulldown resistor to
active-low outputs (MAX6342/MAX6345) and a pullup
resistor to active-high outputs (MAX6344/MAX6345)
ensure that the reset line is valid when the reset output is
no longer sinking or sourcing current (Figures 5 and 6).
6-Pin P Reset Circuit with
Power-Fail Comparator
6
_______________________________________________________________________________________
MAX6343
VCC
GND
RESET
P
+5.0V
+3.3V
10k
VCC
160
100
120
140
0
1
100
1000
60
40
20
80
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
MAXIMUM
TRANSIENT
DURATION
(
s)
10
MAX634_L/M
MAX634_T/S/R/Z
Figure 4. Maximum Transient Duration Magnitude Rejection
Figure 3. Open-Drain RESET Output Allows Use with Multiple
Supplies
VCC
GND
100k
RESET
MAX6342
MAX6345
VCC
GND
100k
RESET
MAX6344
MAX6345
Figure 5. Ensuring RESET Valid to VCC = 0 on Active-Low
Push-Pull Outputs
Figure 6. Ensuring RESET Valid to VCC = 0 on Active-High
Push-Pull Outputs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6343MUT | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6343MUT+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.38V 30UA 6PIN SOT-23 - Rail/Tube |
| MAX6343MUT+T | 功能描述:监控电路 6-Pin uPower Reset Circuit RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6343MUT-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6343RUT | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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