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| 型号： | MAX817LEPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 5V 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
+5V Microprocessor Supervisory Circuits
desired trip point (V TRIP ). Resistor R3 adds hysteresis.
It will typically be an order of magnitude greater than R1
or R2. The current through R1 and R2 should be at least
+5V
1μA to ensure that the 25nA (max) PFI input leakage
R 1
V CC
current does not shift the trip point. R3 should be larger
than 200k ? to prevent it from loading down the PFO pin.
Capacitor C1 adds additional noise rejection.
PFI
MAX817
MAX819
PFO
R 2
Monitoring an Additional Supply
(MAX817/MAX819)
The MAX817/MAX819 μP supervisors can monitor either
positive or negative supplies using a resistor voltage
divider to PFI. PFO can be used to generate an interrupt
to the μP or to trigger a reset (Figures 9 and 13).
+5V
V-
GND
Interfacing to μPs with
Bidirectional Reset Pins
μPs with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the MAX817/MAX818/
PFO
0V
V TRIP
V-
0V
MAX819 RESET output. If, for example, the RESET out-
put is driven high and the μP wants to pull it low, inde-
5 - 1.25
R1
=
1.25 - V TRIP
R2
terminate logic levels 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.
Negative-Going V CC Transients
These supervisors are relatively immune to short-dura-
tion, negative-going V CC transients (glitches) while
issuing a reset to the μP during power-up, power-down,
and brownout conditions. Therefore, resetting the μP
when V CC experiences only small glitches is usually not
desirable.
The Typical Operating Characteristics show a graph of
Maximum Transient Duration vs. Reset Threshold
NOTE: V TRIP IS NEGATIVE
Figure 13. Monitoring a Negative Voltage
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
Overdrive for which reset pulses are not generated. The
graph was produced using negative-going V CC pulses,
starting at 3.3V and ending below the reset threshold by
the magnitude indicated (reset threshold overdrive). The
graph shows the maximum pulse width that a negative-
going V CC transient can typically have without triggering
a reset pulse. As the amplitude of the transient increases
(i.e., goes farther below the reset threshold), the maxi-
mum allowable pulse width decreases. Typically, a V CC
V CC
MAX817
MAX818
MAX819
RESET
GND
4.7k
RESET
V CC
GND
transient that goes 100mV below the reset threshold and
lasts for 135μs will not trigger a reset pulse.
A 0.1μF bypass capacitor mounted close to the V CC
pin provides additional transient immunity.
Figure 14. Interfacing to μPs with Bidirectional Reset I/O
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX817LEPA+ | 功能描述:监控电路 5V MPU 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 |
| MAX817LESA | 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 |
| MAX817LESA+ | 功能描述:监控电路 5V MPU 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 |
| MAX817LESA+T | 功能描述:监控电路 5V MPU 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 |
| MAX817LESA-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 |
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