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| 型号： | MAX814NESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.55V |
| 工作温度： | -40°C ~ 85°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： | 带卷 (TR) |
±1% Accuracy, Low-Power, +3V and +5V
μP Supervisory Circuits
+5V
R1
V CC
MR
100k ?
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
MAX814
100k ?
V CC
V CC
PFI
MAX815 PFO
MAX816
2N3904
MAX814
MAX815
μ P
R2
GND
RESET
TO μ P
MAX816
RESET
4.7k ?
RESET
V-
MR
+5V
0V
+5V
GND
GND
PFO
0V
Figure 14. Interfacing to μPs with Bidirectional Reset I/O
V-
5 - 2.5 2.5 - V TRIP ,
=
R1 R2
V TRIP
V TRIP < 0V
0V
Negative-Going V CC Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX814/
V PFT = 2.5V (K, L, N); 1.70V (T AND MAX816)
Figure 12. Monitoring a Negative Voltage
BEGIN PROGRAM
SET LOW
WDI
SET HIGH
WDI
MAX815/MAX816 series is relatively immune to short
duration negative-going V CC transients (glitches). The
Typical Operating Characteristics show a graph of
Maximum Transient Duration vs. Reset Comparator
Overdrive, for which a reset is not generated. The
graph was made using a negative-going pulse applied
to V CC , starting 1.5V above the actual reset threshold
and ending below it by the magnitude indicated (reset
comparator overdrive). The graph indicates the typical
maximum pulse width a negative-going V CC transient
may have without causing a reset pulse. As the magni-
tude of the transient increases (goes further below the
reset threshold), the maximum allowable pulse width
decreases. Typically, a V CC that goes 100mV below the
reset threshold and lasts 30μs or less will not cause a
reset pulse to be issued.
A 0.1μF bypass capacitor mounted as close as possible
to pin 2 (V CC ) provides additional transient immunity.
SUBROUTINE
Interfacing to μPs
with Bidirectional Reset Pins
SET LOW
WDI
μPs with bidirectional reset pins, such as the Motorola
68HC11 series, can cause a conflict with the RESET
output. If, for example, the RESET output is driven high
YES
RETURN
NO
and the μP wants to pull it low, indeterminate logic lev-
els may result. To correct this, connect a 4.7k ? resistor
between the RESET output and the μP reset I/O, as in
Figure 14. Buffer the RESET output to other system
components.
Figure 13. Flow Chart of WDI Implementation
14
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX814T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:【1% Accuracy, Low-Power, +3V and +5V レP Supervisory Circuits |
| MAX814TC | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:【1% Accuracy, Low-Power, +3V and +5V レP Supervisory Circuits |
| MAX814TCPA | 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 |
| MAX814TCPA+ | 功能描述:监控电路 3V & 5V 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 |
| MAX814TCSA | 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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