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| 型号： | CAT1232LPV-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 5V 8-SOIC |
| 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： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 4.37V，4.62V |
| 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) |
CAT1232LP, CAT1832
ˉˉ
WATCHDOG TIMER AND ST INPUT
ˉˉ ˉˉ
A watchdog timer stops and restarts a microprocessor
that has stopped proper operation or become “hung”.
The watchdog performs this function by monitoring the
ST input. After the reset outputs go inactive the ST
TD Voltage
Level
GND
Watchdog Time-out Period (ms)
Min Nominal Max
62.5 150 250
ˉˉ
input must be strobed with a high-to-low signal
transition prior to the minimum watchdog timeout
period. However if the ST input is not strobed with a
high-to-low signal transition prior to a watchdog
timeout the reset outputs will become active for TRST
reseting and restarting the microprocessor. Once the
Floating
V CC
250
500
CAT1832
600
1200
3.3V
1000
2000
resets return to the inactive state the watchdog timer
restarts the process.
ˉˉ
The TD input allows the user to select from three
predetermined watchdog timeout periods. Always use
the minimum timeout period to determine the required
frequency of ST high-to-low transitions and the
1
2
3
4
PBRST
TD
TOL
GND
VCC
ST
RESET
RESET
8
7
6
5
I/O
μP
RESET
ˉˉ
maximum to determine the time prior to the reset
outputs becoming active. ST pulse widths must be
20 ns or greater.
The watchdog timer cannot be disabled. It must be
strobed with a high-to-low signal transition to avoid a
watchdog timeout and subsequent reset.
Figure 4. CAT1832 Application Circuit:
Pushbutton Reset
CAT1232LP
5V
1
PBRST
VCC
8
MREQ
2
3
4
TD
TOL
GND
ST
RESET
RESET
7
6
5
10k
μP
RESET
Address Bus
Decoder
Figure 5. CAT1232LP Application Circuit: Watchdog Timer
PBRST
t PB
t PDLY
V IH
ST
Valid
Strobe
Valid
Strobe
Invalid
Strobe
V IL
t ST
RESET
RESET
t RST
V OH
V OL
RESET
RESET
t RST t TD t TD
(Min) (Min)
Note: ST is ignored whenever a reset is active
Figure 6. Timing Diagram: Pushbutton Reset
Figure 7. Timing Diagram: Strobe Input
Doc. No. MD-3018 Rev. F
6
? 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT1232LPV-T3 | 功能描述:IC SUPERVISOR MPU 5V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 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 145 ms 电压 - 阀值:2.64V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商设备封装:16-TQFN-EP（4x4） 包装:带卷 (TR) |
| CAT1232LPW | 制造商:ON Semiconductor 功能描述:SUPERVISOR, 5 V - Rail/Tube |
| CAT1232LPW-G | 制造商:ON Semiconductor 功能描述:SUPERVISOR, 5 V - Rail/Tube |
| CAT1232LPW-GT2 | 制造商:ON Semiconductor 功能描述:SUPERVISOR, 5 V - Tape and Reel |
| CAT1232LPW-T2 | 功能描述:监控电路 SUP 5 V 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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