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| 型号： | MAX706CUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 4.4V |
| 工作温度： | 0°C ~ 70°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： | 带卷 (TR) |
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Power-Fail Comparator
The power-fail comparator can be used for various pur-
poses because its output and noninverting input are
not internally connected. The inverting input is internal-
ly connected to a 1.25V reference.
To build an early-warning circuit for power failure, con-
nect the PFI pin to a voltage divider (see Typical
Operating 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 μP
so it can prepare for an orderly power-down.
WDI
WDO
+5V
0V
+5V
0V
t WP
t WD
t WD
t WD
__________Applications Information
Ensuring a Valid RESET
Output Down to V CC = 0V
When V CC falls below 1V, the MAX705-MAX708 RESET
output no longer sinks current—it becomes an open cir-
cuit. High-impedance CMOS logic inputs can drift to
undetermined voltages if left undriven. If a pull-down
resistor is added to the RESET pin as shown in Figure 5,
+5V
any stray charge or leakage currents will be drained to
RESET
(RESET)
0V
+5V
0V
RESET EXTERNALLY
TRIGGERED BY MR
t RS
ground, holding RESET low. Resistor value (R1) is not
critical. It should be about 100k ? , large enough not to
load RESET and small enough to pull RESET to ground.
Monitoring Voltages Other Than the
Unregulated DC Input
( ) ARE FOR MAX813L ONLY.
Figure 3. MAX705/MAX706/MAX813L Watchdog Timing
Monitor voltages other than the unregulated DC by
connecting a voltage divider to PFI and adjusting the
ratio appropriately. If required, add hysteresis by con-
necting a resistor (with a value approximately 10 times
the sum of the two resistors in the potential divider net-
work) between PFI and PFO . A capacitor between PFI
and GND will reduce the power-fail circuit’s sensitivity
to high-frequency noise on the line being monitored.
V CC
V RT
V RT
t RS
t RS
RESET can be asserted on other voltages in addition to
the +5V V CC line. Connect PFO to MR to initiate a RESET
pulse when PFI drops below 1.25V. Figure 6 shows the
MAX705-MAX708 configured to assert RESET when the
+5V
RESET
0V
+5V
MR
+5V supply falls below the reset threshold, or when the
+12V supply falls below approximately 11V.
Monitoring a Negative Voltage
The power-fail comparator can also monitor a negative
supply rail (Figure 7). When the negative rail is good (a
negative voltage of large magnitude), PFO is low, and
WDO
0V
+5V
0V
t MD
t MR
MR EXTERNALLY DRIVEN LOW
when the negative rail is degraded (a negative voltage
of lesser magnitude), PFO is high. By adding the resis-
tors and transistor as shown, a high PFO triggers reset.
As long as PFO remains high, the MAX705-
MAX708/MAX813L will keep reset asserted ( RESET =
low, RESET = high). Note that this circuit’s accuracy
depends on the PFI threshold tolerance, the V CC line,
and the resistors.
Figure 4. MAX705/MAX706 RESET, MR , and WDO Timing with
WDI Three-Stated. The MAX707/MAX708/MAX813L RESET
output is the inverse of RESET shown.
Maxim Integrated
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX706EPA | 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 |
| MAX706EPA+ | 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 |
| MAX706EPA+T | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.4V 500UA 8PDIP N - Tape and Reel |
| MAX706ESA | 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 |
| MAX706ESA+ | 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 |
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