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参数资料
| 型号： | MAX6743XKWID3-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits |
| 中文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | EIAJ, SC-70, 5 PIN |
| 文件页数： | 3/16页 |
| 文件大小： | 236K |
| 代理商： | MAX6743XKWID3-T |
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
______________________________________________________________________________________
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released. The manual reset detect function is internally
debounced for the tDEB timeout period, so the output
can be connected directly to a momentary pushbutton
switch, if desired (Figure 2).
Manual Reset Input
Many microprocessor-based products require manual
reset capability, allowing the operator, a test techni-
cian, or external logic circuitry to initiate a reset while
the monitored supplies remain above their reset thresh-
olds. The MAX6736–MAX6739 have a dedicated
active-low
MR input. The RESET is asserted low while
MR is held low and remains asserted for the manual
reset timeout period after
MR returns high. The MR
input has an internal 1.5k
pullup resistor to VCC1 and
can be left unconnected if not used.
MR can be driven
with CMOS logic levels, open-drain/open-collector out-
puts, or a momentary pushbutton switch to GND to cre-
ate a manual reset function.
Adjustable Input Voltage
The MAX6738/MAX6739 and MAX6740/MAX6743 pro-
vide an additional input to monitor a second or third
system voltage. The threshold voltage at RSTIN is typi-
cally 488mV. Connect a resistor-divider network to the
circuit as shown in Figure 3 to establish an externally
controlled threshold voltage, VEXT_TH.
VEXT_TH = 0.488V((R1 + R2) / R2)
Low leakage current at RSTIN allows the use of large-
valued resistors, resulting in reduced power consump-
tion of the system.
Power-Fail Comparator
PFI is the noninverting input to an auxiliary comparator. A
488mV internal reference (VTH-PFI) is connected to the
inverting input of the comparator. If PFI is less than
488mV,
PFO is asserted low. PFO deasserts without a
timeout period when PFI rises above the externally set
threshold. Common uses for the power-fail comparator
include monitoring for low battery conditions or a failing
DC-DC converter input voltage (see the Typical
Application Circuits). The asserted
PFO output can place
a system in a low-power suspend mode or support an
orderly system shutdown before monitored VCC voltages
drop below the reset thresholds. Connect PFI to an exter-
nal resistor-divider network as shown in Figure 4 to set
the desired trip threshold. Connect PFI to VCC1 if unused.
Applications Information
Interfacing to the P with
Bidirectional Reset Pins
Most microprocessors with bidirectional reset pins can
interface directly to open-drain
RESET output options.
Systems simultaneously requiring a push-pull RESET
output and a bidirectional reset interface can be in
logic contention. To prevent contention, connect a
4.7k
resistor between RESET and the P’s reset I/O
port as shown in Figure 5.
Figure 2. MAX6740/MAX6741/MAX6742 Manual Reset Timing Diagram
OPEN
CLOSED
tDEB
GND
tMRP
tDEB
VCC1
RESET
PUSHBUTTON
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
MAX6738
MAX6739
MAX6740
MAX6743
RSTIN
GND
VEXT_TH
R1
R2
Figure 3. Monitoring an Additional Voltage
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6743XKWID7 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL-/TRIPLE-VOLTAGE SC70 - Rail/Tube |
| MAX6743XKWID7+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 |
| MAX6743XKWID7-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 |
| MAX6743XKWTD3 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL-/TRIPLE-VOLTAGE SC70 - Cut Tape Product |
| MAX6743XKWTD3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.665V/3.075V/ADJV 5UA/10UA 5PIN SC-70 - Rail/Tube |
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