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| 型号： | CAT824TTDI-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 3.08V TSOT23-5 |
| 标准包装： | 3,000 |
| 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： | 高有效/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： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | 824TTDI-GT3 |
CAT823, CAT824, CAT825
Watchdog Timer
The CAT823 and CAT824 provide a Watchdog input
(WDI). The watchdog timer function forces RESET (and
RESET in the CAT824) signals active when the WDI input
does not have a transition from low ? to ? high or high ? to ? low
within 1.12 seconds. Timeout of the watchdog starts when
RESET (RESET on the CAT824) becomes inactive. If a
transition occurs on the WDI input pin prior to the watchdog
time ? out, the watchdog timer is reset and begins to time ? out
again. If the watchdog timer is allowed to time ? out, then the
reset output(s) will go active for t RP and once released will
repeat the watchdog timeout process.
Figure 6 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 7). 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.
WDI
MR
Supply
Voltage
CAT823
GND
PIC
μ C
ADDRESS
DECODER
V CC
RESET
MCLR
Figure 6. Watchdog Timer
RESET
V CC
V CC
Tristate
GND
CAT823
150 k W
m C
MR
WDI
110 k W
OUTPUT
Figure 7. Watchdog Disable Circuit
WDI
INVALID
STROBE
VALID
STROBE
INDETERMINATE
STROBE
t WD
MIN.
MAX.
RESET
Figure 8. Timing Diagram – Strobe Input
http://onsemi.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT824UTDI-GT3 | 制造商:ON Semiconductor 功能描述:RESET CONTL FLOATING GATE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / RESET CONTL FLOATING GATE |
| CAT824YSDI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT824YSDI-GT3 | 功能描述:监控电路 RESET CONTL FLOATING GATE 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 |
| CAT824YTDI-G | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT824YTDI-GT3 | 功能描述:监控电路 act low act hi/WD 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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