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参数资料
| 型号： | MAX6740XKVFD3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 150 ms |
| 电压 - 阀值： | 1.05V，1.575V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 带卷 (TR) |
Low-Power Dual-/Triple-Voltage SC70 μP
Supervisory Circuits
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
OPEN
PUSHBUTTON
SWITCH
CLOSED
V CC 1
t DEB
t MRP
t DEB
t MRP
RESET
GND
Figure 2. MAX6740/MAX6741/MAX6742 Manual Reset Timing Diagram
released. The manual reset detect function is internally
debounced for the t DEB 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 V CC 1 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, V EXT_TH .
V EXT_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 (V TH - 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 V CC 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 V CC 1 if unused.
Applications Information
Interfacing to the μP with
V EXT_TH
R1
RSTIN
MAX6738
MAX6739
MAX6740
MAX6743
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
R2
logic contention. To prevent contention, connect a
4.7k ? resistor between RESET and the μP’s reset I/O
port as shown in Figure 5.
GND
Figure 3. Monitoring an Additional Voltage
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6740XKVFD7 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL/TRIPLE-VOLTAGE SC70 - Rail/Tube |
| MAX6740XKVFD7+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 |
| MAX6740XKVFD7-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 |
| MAX6740XKVHD3 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL/TRIPLE-VOLTAGE SC70 - Cut Tape Product |
| MAX6740XKVHD3+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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