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| 型号： | MAX817LEPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16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
Watchdog Software Considerations
(MAX817/MAX818)
To help the watchdog timer monitor software execution
more closely, set and reset the watchdog input at different
points in the program, rather than “pulsing” the watchdog
input high-low-high or low-high-low. This technique avoids
a “stuck” loop, in which the watchdog timer would contin-
ue to be reset within the loop, keeping the watchdog from
timing out. Figure 15 shows an example of a flow diagram
where the I/O driving the watchdog input is set high at the
beginning of the program, set low at the beginning of
every subroutine or loop, then set high again when the
program returns to the beginning. If the program should
“hang” in any subroutine, the problem would quickly be
corrected, since the I/O is continually set low and the
watchdog timer is allowed to time out, triggering a reset or
an interrupt. As described in the Watchdog Input Current
section, this scheme results in higher average WDI input
current than does the method of leaving WDI low for the
majority of the timeout period and periodically pulsing it
low-high-low.
__________Typical Operating Circuit
START
SET
WDI
LOW
SUBROUTINE
OR PROGRAM LOOP,
SET WDI
HIGH
RETURN
END
Figure 15. Watchdog Flow Diagram
____Pin Configurations (continued)
TOP VIEW
+5V
0.1 μ F
BATT
V CC
OUT
CMOS
RAM
REAL-
TIME
CLOCK
OUT 1
V CC 2
GND 3
MAX818
8
7
6
BATT
RESET
WDI
CE IN 4
5
CE OUT
0.1 μ F
MAX817
MAX818
MAX819
0.1 μ F
A0–A15
DIP/SO/ μ MAX
RESET
RESET
μ P
WDI**
I/O
OUT 1
8
BATT
CE IN*
CE OUT*
GND
ADDRESS
DECODE
V CC 2
GND 3
MAX819
7
6
RESET
MR
*CE IN AND CE OUT APPLY TO MAX818 ONLY.
**WDI APPLIES TO MAX817/MAX818 ONLY.
PFI 4
DIP/SO/ μ MAX
5
PFO
______________________________________________________________________________________
15
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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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