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参数资料
| 型号： | MAX801NCSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12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
REGULATOR
4.5V to 5.5V
V CC
LOWLINE
TO μ P NMI
V CC
P
MAX801
MAX808
C HOLD
MAX801
MAX808
CONTROL
CIRCUITRY
OUT
0.1 μ F
C HOLD > I LOAD x t SHDN
GND
BATT
P
P
V LR
Figure 3. Using LOWLINE to Provide a Power-Fail Warning to
the μP
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) )
Figure 4. V CC and BATT to OUT Switch
Table 1. Input and Output Status in
Battery-Backup Mode
PIN
where t SHDN is the time required for the system to com-
plete the shutdown routine (including the V CC to low-
MAX801 MAX808
NAME
STATUS
line propagation delay), I LOAD is the current being
drained from the capacitor, and V LR is the low-line to
reset threshold.
Output Supply Voltage
The output supply (OUT) transfers power from V CC or
BATT to the μP, RAM, and other external circuitry. At
the maximum source current of 250mA, V OUT will typi-
cally be 220mV below V CC . Decouple OUT with a 0.1μF
1
2
3
4
1
2
3
4
V CC
LOWLINE
RESET
GND
Battery switchover
comparator monitors V CC
for active switchover.
Logic low
Logic low
Ground—0V reference for
all signals
capacitor to ground.
Battery-Backup Mode
5
—
RESET
Logic high; the open-circuit
voltage is equal to V CC .
Battery-backup mode preserves the contents of RAM in
the event of a brownout or power failure. With a backup
battery installed at BATT, the MAX801/MAX808 automati-
cally switches RAM to backup power when V CC falls.
Two conditions are required for switchover to battery-
backup mode: 1) V CC must be below the reset threshold;
2) V CC must be below V BATT . Table 1 lists the status of
inputs and outputs during battery-backup mode.
BATT is designed to conduct up to 20mA to OUT dur-
ing battery backup. The PMOS switch on-resistance is
approximately 12 Ω . Figure 4 shows the two series pass
elements (between the BATT input and OUT) that
—
6
—
7
8
5
—
6
7
8
CE OUT
WDI
CE IN
BATT
OUT
Logic high. The open-circuit
output voltage is equal to
V BATT (MAX808).
WDI is ignored and goes
high impedance.
High impedance (MAX808)
Supply current is 1μA max for
V BATT ≤ 2.8V.
OUT is connected to BATT
through two internal PMOS
switches in series.
facilitate UL recognition. V BATT can exceed V CC during
normal operation without causing a reset.
_______________________________________________________________________________________
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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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