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| 型号： | MAX807NCWE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.425V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
Full-Featured μP Supervisory Circuit with
±1.5% Reset Accuracy
V RST MAX
V CC
RESET
THRESHOLD
V CC
CE IN
MAX807
CE OUT
RESET
28 μ s
26 μ s
26 μ s
50 ? DRIVER
CE IN
CE OUT
50pF
C LOAD
RESET
Figure 7. Reset and Chip-Enable Timing
(see the Chip-Enable Propagation Delay vs. CE OUT
Load Capacitance graph in the Typical Operating
Characteristics ). The CE propagation delay is produc-
GND
Figure 8. CE Propagation Delay Test Circuit
tion tested from the 50% point on CE IN to the 50%
point on CE OUT using a 50 ? driver and 50pF of load
capacitance (Figure 8). For minimum propagation
delay, minimize the capacitive load at CE OUT and use
REGULATOR
4.5V to 5.5V
V CC
LOW LINE
TO μ P NMI
a low output-impedance driver.
Chip-Enable Output
C HOLD
MAX807
In the enabled mode, the impedance of CE OUT is equiv-
alent to 75 ? in series with the source driving CE IN. In the
disabled mode, the 75 ? transmission gate is off and CE
OUT is actively pulled to the higher of V CC or V BATT . This
source turns off when the transmission gate is enabled.
Low-Line Comparator
The low-line comparator monitors V CC with a threshold
voltage typically 52mV above the reset threshold, with
C HOLD > I LOAD x t SHDN
V LR
GND
13mV of hysteresis. Use LOW LINE to provide a non-
maskable interrupt (NMI) to the μP when power begins
to fall to initiate an orderly software shutdown routine.
In most battery-operated portable systems, reserve
energy in the battery provides ample time to complete
the shutdown routine once the low-line warning is
encountered, and before reset asserts. If the system must
contend with a more rapid V CC fall time—such as when
the main battery is disconnected, a DC-DC converter
shuts down, or a high-side switch is opened during
normal operation—use capacitance on the V CC line to
provide time to execute the shutdown routine (Figure 9).
First calculate the worst-case time required for the
system to perform its shutdown routine. Then, with the
Figure 9. Using LOW LINE to Provide a Power-Fail Warning to
the μP
worst-case shutdown time, the worst-case load current,
and the minimum low-line to reset threshold (V LR(min) ),
calculate the amount of capacitance required to allow the
shutdown routine to complete before reset is asserted:
C HOLD = (I LOAD x t SHDN ) / V LR (min)
where t SHDN is the time required for the system to com-
plete the shutdown routine, and includes the V CC to
low-line propagation delay; and where I LOAD is the cur-
rent being drained from the capacitor, V LR is the low-
line to reset threshold.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX807NCWE+ | 功能描述:监控电路 Full-Featured 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 |
| MAX807NCWE+T | 功能描述:监控电路 Full-Featured 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 |
| MAX807NCWE-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 |
| MAX807NEPE | 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 |
| MAX807NEPE+ | 功能描述:监控电路 Full-Featured 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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