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| 型号： | MAX801NCSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 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： | 4.575V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
8-Pin μP Supervisory Circuits
with ±1.5% Reset Accuracy
V CC
V RST V LL
V CC
V RST + V LR V RST
V LOWLINE
V LOWLINE
t LL
V RESET
V RESET
(MAX801)
t RP
t RP
V RESET
V RESET
(MAX801)
t RD
t RD
V CE OUT
(MAX808)
V BATT
V CE OUT
(MAX808)
t RCE
V BATT
SHOWN FOR V CC = 0V to 5V, V BATT = 2.8V, CE IN = GND
Figure 2a. Timing Diagram, V CC Rising
_______________Detailed Description
The MAX801/MAX808 microprocessor (μP) supervisory
circuits provide power-supply monitoring and backup-
battery switchover in μP systems. The MAX801 also
provides program-execution watchdog functions
(Figure 1). Use of BiCMOS technology results in an
improved, 1.5% reset-threshold precision while keeping
supply currents typically at 68μA (48μA for the
MAX808). The MAX801/MAX808 are intended for bat-
tery-powered applications that require high reset-
threshold precision, allowing a wide power-supply
operating range while preventing the system from oper-
ating below its specified voltage range.
RESET and RESET Outputs
The MAX801/MAX808’s RESET output ensures that the
μP powers up in a known state, and prevents code-
execution errors during power-down and brownout
conditions. It does this by resetting the μP, terminating
program execution when V CC dips below the reset
threshold. Each time RESET is asserted, it stays low for
at least the 200ms reset timeout period (set by an inter-
nal timer) to ensure the μP has adequate time to return
to an initial state. The internal timer restarts any time
V CC goes below the reset threshold (V RST ) before the
reset timeout period is completed. The watchdog timer
on the MAX801 can also initiate a reset (see the
MAX801 Watchdog Timer section).
SHOWN FOR V CC = 5V to 0V, V BATT = 2.8V, CE IN = GND
Figure 2b. Timing Diagram, V CC Falling
The RESET output is active low, and is implemented with
a strong pull-down/relatively weak pull-up structure. It is
guaranteed to be a logic low for 0V < V CC < V RST , pro-
vided V BATT is greater than 2V. Without a backup bat-
tery, RESET is guaranteed valid for V CC ≥ 1V.
The RESET output is the inverse of the RESET output; it
both sources and sinks current and cannot be wire-OR
connected.
Low-Line Comparator
The low-line comparator monitors V CC with a threshold
voltage typically 52mV above the reset threshold, with
13mV of hysteresis. Use LOWLINE to provide a non-
maskable interrupt (NMI) to the μP when power begins
to fall, initiating an orderly software shutdown routine. In
most battery-operated portable systems, reserve ener-
gy in the battery provides ample time to complete the
shutdown routine once the low-line warning is encoun-
tered and before reset asserts. If the system must con-
tend with a more rapid V CC fall time (such as when the
main battery is disconnected, when a DC-DC converter
shuts down, or when a high-side switch is opened dur-
ing normal operation), use capacitance on the V CC line
to provide time to execute the shutdown routine (Figure
3). First calculate the worst-case time required for the
system to perform its shutdown routine. Then, with
worst-case shutdown time, worst-case load current,
and minimum low-line to reset threshold (V LR(min) ),
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX801NCSA+ | 功能描述:监控电路 8-Pim 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 |
| MAX801NCSA+T | 功能描述:监控电路 8-Pim 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 |
| MAX801NCSA-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 |
| MAX801NEPA | 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 |
| MAX801NEPA+ | 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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