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| 型号： | MAX706SEUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/15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
WDI
6
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
8
WDO
V CC
8
RESET
MR
V CC
1
2
V CC
70 μ A
TIMEBASE FOR
RESET AND
WATCHDOG
RESET
GENERATOR
7
RESET
(RESET)
MR
V CC
1
2
70 μ A
RESET
GENERATOR
7
RESET
2.63V MAX708R
PFI
4
2.63V MAX706P/R
2.93V MAX706S MAX706P/R/S/T
3.08V MAX706T MAX706AP/AR/AS/AT
5
PFO
PFI
4
2.93V MAX708S
3.08V MAX708T
1.25V
MAX708R/S/T
5
PFO
1.25V
3 GND
( ) ARE FOR MAX706P/AP.
3 GND
Figure 1. MAX706_ Functional Diagram
RESET and RESET Outputs
A microprocessor’s (μP’s) reset input starts in a known
state. When the μP is in an unknown state, it should be
held in reset. The MAX706P/R/S/T and the MAX706AP/
AR/AS/AT assert reset when V CC is low, preventing
code execution errors during power-up, power-down,
or brownout conditions.
On power-up once V CC reaches 1V, RESET is guaran-
teed to be logic-low and RESET is guaranteed to be
logic-high. As V CC rises, RESET and RESET remain
asserted. Once V CC exceeds the reset threshold, the
internal timer causes RESET and RESET to be
deasserted after a time equal to the reset pulse width,
which is typically 200ms (Figure 3).
If a power-fail or brownout condition occurs (i.e., V CC
drops below the reset threshold), RESET and RESET
are asserted. As long as V CC remains below the reset
threshold, the internal timer is continually reset, causing
the RESET and RESET outputs to remain asserted.
Thus, a brownout condition that interrupts a previously
initiated reset pulse causes an additional 200ms delay
from the time the latest interruption occurred. On
power-down once V CC drops below the reset threshold,
Figure 2. MAX708_ Functional Diagram
RESET and RESET are guaranteed to be asserted for
V CC ≥ 1V.
The MAX706P/MAX706AP provide a RESET signal, and
the MAX706R/S/T and MAX706AR/AS/AT provide a
RESET signal. The MAX708R/S/T provide both RESET
and RESET .
Watchdog Timer
The MAX706P/R/S/T and the MAX706AP/AR/AS/AT
watchdog circuit monitor the μP ’s activity. If the μP
does not toggle the watchdog input (WDI) within 1.6s,
the watchdog output ( WDO ) goes low (Figure 4). If the
reset signal is asserted, the watchdog timer will be
reset to zero and disabled. As soon as reset is
released, the timer starts counting. WDI can detect puls-
es as narrow as 100ns with a 2.7V supply and 50ns with a
4.5V supply. The watchdog timer for the MAX706P/R/S/T
cannot be disabled. The watchdog timer for the
MAX706AP/AR/AS/AT operates similarly to the
MAX706P/R/S/T. However, the watchdog timer for the
MAX706AP/AR/AS/AT disables when the WDI input is
left open or connected to a tri-state output in its high-
impedance state and with a leakage current of less
than 600nA. The watchdog timer can be disabled any-
time, provided WDO is not asserted.
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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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