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| 型号： | CAT706TVI-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 3.08V 8SOIC |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.08V |
| 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： | 标准包装 |
| 产品目录页面： | 806 (CN2011-ZH PDF) |
| 其它名称： | CAT706TVI-GT3DKR |
CAT705, CAT706, CAT813
WATCHDOG TIMER
The CAT705, CAT706, & CAT813 provide a Watchdog
input (WDI). The watchdog timer function controls the
watchdog output (WDO) signal and forces the WDO to be
low (active) when the WDI input does not have a transition
from low ? to ? high or high ? to ? low within 1.6 s typical. If a
transition occurs on the WDI input pin prior to the watchdog
time ? out, the watchdog timer is restarted. The timing
diagram is shown in Figure 6. The watchdog timer starts as
soon as reset condition becomes inactive.
When the V CC supply drops below the reset threshold, the
WDO output becomes active and goes low independently of
the watchdog timing stage.
Figure 7 below shows a typical implementation of a
watchdog function. Any processor signal that repeats
dependant on the normal operation of the processor or
directed by the software operating on the processor can be
used to strobe the watchdog input. The most reliable is a
dedicated I/O output transitioned by a specific software
instruction.
The watchdog can be disabled by floating (or tri ? stating)
the WDI input (see Figure 8). If the watchdog is disabled the
WDI pin will be pulled low for the first 7/8 th ’s of the
watchdog period (t WD ) and pulled high for the last 1/8 th of
the watchdog period. This pulling low of the WDI input and
then high is used to detect an open or tri ? state condition and
will continue to repeat until the WDI input is driven high or
low.
For most efficient operation of devices with the watchdog
function the WDI input should be held low the majority of
the time and only strobed high as required to reset the
watchdog timer.
t WP
t WDSU
WDI
WDO
+5 V
0V
+5 V
0V
t WD
t WD
t WD
RESET
(RESET)
+5 V
0V
+5 V
0V
RESET EXTERNALLY
TRIGGERED BY MR
t RS
(() Are for CAT813 Only)
Figure 6. Watchdog Timing Diagram
MR
WDO
PIC
m C
MCLR
ADDRESS
DECODER
V CC
RESET/RESET
GND
PFI
CAT705
CAT706
CAT813
WDI
PFO
Figure 7. Watchdog Timer Circuit
http://onsemi.com
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT706TZGI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT706TZI-G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:μP Supervisory Circuits |
| CAT706TZI-GT3 | 功能描述:监控电路 4.4V Pull Low 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 |
| CAT706VGI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT706VI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:レP Supervisory Circuits |
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