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| 型号： | MAX811REUS+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC MPU V-MONITOR 2.63V SOT143-4 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.63V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 标准包装 |
| 产品目录页面： | 1413 (CN2011-ZH PDF) |
| 其它名称： | MAX811REUS+TDKR |
4-Pin μP Voltage Monitors
with Manual Reset Input
______________________________________________________________ Pin Description
PIN
NAME
FUNCTION
MAX811
MAX812
1
1
GND
Ground
Active-Low Reset Output. RESET remains low while V CC is below the reset threshold or while
2
—
RESET
MR is held low. RESET remains low for the Reset Active Timeout Period (t RP ) after the reset
conditions are terminated.
Active-High Reset Output. RESET remains high while V CC is below the reset threshold or while
—
2
RESET
MR is held low. RESET remains high for Reset Active Timeout Period (t RP ) after the reset condi-
tions are terminated.
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is
3
3
MR
low and for 180ms after MR returns high. This active-low input has an internal 20k Ω pull-up
resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch.
Leave open if unused.
4
4
V CC
+5V, +3.3V, or +3V Supply Voltage
_______________ Detailed Description
Reset Output
A microprocessor’s (μP’s) reset input starts the μP in a
known state. These μP supervisory circuits assert reset
to prevent code execution errors during power-up,
power-down, or brownout conditions.
RESET is guaranteed to be a logic low for V CC > 1V.
Once V CC exceeds the reset threshold, an internal
timer keeps RESET low for the reset timeout period;
after this interval, RESET goes high.
If a brownout condition occurs (V CC dips below the
reset threshold), RESET goes low. Any time V CC goes
below the reset threshold, the internal timer resets to
zero, and RESET goes low. The internal timer starts
after V CC returns above the reset threshold, and RESET
remains low for the reset timeout period.
The manual reset input ( MR ) can also initiate a reset.
See the Manual Reset Input section.
The MAX812 has an active-high RESET output that is
the inverse of the MAX811’s RESET output.
Manual Reset Input
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for the Reset Active Timeout Period (t RP ) after MR
returns high. This input has an internal 20k Ω pull-up
resistor, so it can be left open if it is not used. MR can
be driven with TTL or CMOS-logic levels, or with open-
drain/collector outputs. Connect a normally open
momentary switch from MR to GND to create a manual-
reset function; external debounce circuitry is not
required. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a
0.1μF capacitor from MR to ground provides additional
noise immunity.
Reset Threshold Accuracy
The MAX811/MAX812 are ideal for systems using a 5V
±5% or 3V ±5% power supply with ICs specified for 5V
±10% or 3V ±10%, respectively. They are designed to
meet worst-case specifications over temperature. The
reset is guaranteed to assert after the power supply
falls out of regulation, but before power drops below
the minimum specified operating voltage range for the
system ICs. The thresholds are pre-trimmed and exhibit
tight distribution, reducing the range over which an
undesirable reset may occur.
_______________________________________________________________________________________
5
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相关代理商/技术参数 |
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| MAX811SCUS-T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX811SEUS | 制造商:Maxim Integrated Products 功能描述:4-PIN UP VOLTAGE MONITORS WITH MANU - Bulk |
| MAX811SEUS/GG8 | 制造商:Maxim Integrated Products 功能描述: |
| MAX811SEUS/GG8-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 |
| MAX811SEUS/GH9 | 制造商:Maxim Integrated Products 功能描述:4-PIN ?P VOLTAGE MONITORS WITH MANUAL RESET INPUT - Rail/Tube |
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