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参数资料
| 型号： | MAX807NEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16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： | 1,000 |
| 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： | -40°C ~ 85°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： | 带卷 (TR) |
Full-Featured μP Supervisory Circuit with
±1.5% Reset Accuracy
V IN
R1
V CC
R1
V CC
PFI
MAX807
PFO
PFI
MAX807
PFO
R2
GND
R2
GND
MR
V CC
PFO
V IN
V CC
PFO
V L
V TRIP
0V
V IN
V TRIP
V H
V IN
(
V L = R2 (V PFT )
( R1 + R2 ) –
)
(
)
V TRIP = V PFT
(
V H = (V PFT + V PFH )
a)
V TRIP = R2 (V PFT + V PFH )
1
+
R1
1 1
1 V CC
R2 R1
–
V CC
R1
WHERE V PFT = 2.265V
V PFH = 20mV
NOTE: V TRIP, V L ARE NEGATIVE.
b)
R1 + R2
R2
R1 + R2
R2
)
Figure 10. Using the Power-Fail Comparator to Monitor an Additional Power Supply: a) V IN is Negative, b) V IN is Positive
FROM
REGULATED
SUPPLY
0.1 μ F
V CC
MAX807
OUT
0.1 μ F
μ P POWER
POWER TO
CMOS RAM
Power-Fail Comparator
PFI is the noninverting input to an uncommitted com-
parator. If PFI is less than V PFT (2.265V), PFO goes low.
The power-fail comparator is intended to monitor the
preregulated input of the power supply, providing an
BATT
2.8V
μ P
early power-fail warning so software can conduct an
orderly shutdown. It can also be used to monitor sup-
plies other than 5V. Set the power-fail threshold with a
RESET
RESET
resistor-divider, as shown in Figure 10.
a)
LOW LINE
WDI
GND
NMI
I/O LINE
Power-Fail Input
PFI is the input to the power-fail comparator. The typical
comparator delay is 14μs from V IL to V OL (power failing),
and 32μs from V IH to V OH (power being restored). If
unused, connect this input to ground.
VOLTAGE
REGULATOR
0.1 μ F
V CC OUT
MAX807
BATT
0.1 μ F
2.8V
μ P POWER
POWER TO
CMOS RAM
μ P
Power-Fail Output
The Power-Fail Output (PFO) goes low when PFI goes
below V PFT . It typically sinks 3.2mA with a saturation
voltage of 0.1V. With PFI above V PFT , PFO is actively
pulled to V CC . Connecting PFI through a voltage-
divider to a preregulated supply allows PFO to gener-
ate an NMI as the preregulated power begins to fall
PFI
GND
RESET
PFO
WDI
RESET
NMI
I/O LINE
(Figure 11b). If the preregulated supply is inaccessible,
use LOW LINE to generate the NMI (Figure 11a). The
LOW LINE threshold is typically 52mV above the reset
threshold (see the Low-Line Comparator section).
b)
Figure 11. a) If the preregulated supply is inaccessible, LOW
LINE generates the NMI for the μP. b) Use PFO to generate the
μP NMI if the preregulated supply is accessible.
12
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相关代理商/技术参数 |
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|---|---|
| MAX807NMJE | 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 |
| MAX808 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Pin レP Supervisory Circuits with 【1.5eset Accuracy |
| MAX808_CPA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Pin レP Supervisory Circuits with 【1.5eset Accuracy |
| MAX808_CSA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Pin レP Supervisory Circuits with 【1.5eset Accuracy |
| MAX808_EPA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Pin レP Supervisory Circuits with 【1.5eset Accuracy |
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