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| 型号： | MAX706SEUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISOR 3V 8-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 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： | 2.93V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
+3V Voltage Monitoring, Low-Cost μP
Supervisory Circuits
To build an early-warning power-failure circuit, use the
power-fail comparator input (PFI) to monitor the unregu-
lated DC supply voltage (see the Typical Operating
Circuits). Connect the PFI to a resistive-divider network
R1
V IN
+3V/+3.3V
V CC
such that the voltage at PFI falls below 1.25V just
before the regulator drops out. Use PFO to interrupt the
μP so it can prepare for an orderly power-down.
Regulated and unregulated voltages can be monitored
by simply adjusting the PFI resistive-divider network
R2
R3
C1*
PFI
MAX706_
MAX708R/S/T
values to the appropriate ratio. In addition, the reset
signal can be asserted at voltages other that V CC reset
threshold, as shown in Figure 5. Connect PFO to MR to
initiate a reset pulse when the 12V supply drops below
a user-specified threshold (11V in this example) or
when V CC falls below the reset threshold.
Operation with +3V and +5V Supplies
The MAX706P/R/S/T, the MAX706AP/AR/AS/AT, and the
+3V/+3.3V
PFO
0V
0V
TO μ P
PFO
GND
V L V TRIP V H
*OPTIONAL
V TRIP = 1.25
MAX708R/S/T provide voltage monitoring at the reset
threshold (2.63V to 3.08V) when powered from either
+3V or +5V. These devices are ideal in portable-instru-
ment applications where power can be supplied from
either a +3V battery or an AC-DC wall adapter that gen-
V IN
(R1 + R2)
R2
V H = 1.25 (1 + R3 + R2 R1) V L = 1.25 + R1 1.25 - V CC
R2 × R3 R2
- 1.25
R3
erates +5V (a +5V supply allows a μP or a microcon-
troller to run faster than a +3V supply). With a +3V
supply, these ICs consume less power, but output drive
capability is reduced, the MR to RESET delay time
increases, and the MR minimum pulse width increases.
The Electrical Characteristics table provides specifica-
tions for operation with both +3V and +5V supplies.
Figure 7. Adding Hysteresis to the Power-Fail Comparator
+3V/+3.3V
Ensuring a Valid RESET Output Down to
V CC = 0V
R1
V CC
When V CC falls below 1V, the MAX706R/S/T,
MAX706AR/AS/AT, and MAX708R/S/T RESET output no
longer sinks current; it becomes an open circuit. High-
impedance, CMOS logic inputs can drift to undeter-
R2
PFI
PFO
MAX706_
MAX708R/S/T
mined voltages if left as open circuit. If a pulldown
resistor is added to the RESET pin , as shown in Figure
6, any stray charge or leakage current will flow to
GND
ground, holding RESET low. Resistor value R is not criti-
+3V/+3.3V
V-
V CC - 1.25 1.25 - V TRIP
cal, but it should not load RESET and should be small
enough to pull RESET and the input it is driving to
ground. 100k ? is suggested for R1.
Applications Information
Adding Hysteresis to the Power-Fail
PFO
0V
=
R1 R2
NOTE: V TRIP IS NEGATIVE.
V TRIP
V-
0V
Comparator
Hysteresis adds a noise margin to the power-fail com-
parator and prevents repeated triggering of the PFO
when V IN is near the power-fail comparator trip point.
Figure 7 shows how to add hysteresis to the power-fail
comparator. Select the ratio of R1 and R2 such that PFI
Figure 8. Monitoring a Negative Voltage
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX706SEUA+ | 功能描述:监控电路 Single uPower Supervisor 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 |
| MAX706SEUA+T | 功能描述:监控电路 Single uPower Supervisor 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 |
| MAX706SEUA-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 |
| MAX706SFPA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Analog IC |
| MAX706SMJA | 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 |
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