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| 型号： | MAX6304CSA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC CIRCUIT SUPERVISORY LP 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 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 |
| 复位超时： | 最小为 2.8 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | 0°C ~ 70°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： | 管件 |
+5V, Low-Power μP Supervisory Circuits
with Adjustable Reset/Watchdog
V IN
V CC
V CC
V CC
R1
RESET IN
V CC
MAX6302
V CC
80C51
V CC
RESET
RST
R2
MAX6301
MAX6302
0.1μF
WDI
*
I/O
MAX6303
MAX6304
GND
WDS
I/O
I/O
GND
V RST = 1.22
( R1 R2 + R2 )
*THREE-STATE LEAKAGE MUST BE < 10 μ A.
Figure 4. Monitoring Votlages Other than V CC
with C SRT in pF and t RP in μs. C SRT must be a low-leak-
age (< 10nA) type capacitor. Ceramic is recommended.
The watchdog timeout period is adjustable to accom-
modate a variety of μP applications. With this feature,
the watchdog timeout can be optimized for software
execution. The programmer can determine how often
the watchdog timer should be serviced. Adjust the
watchdog timeout period (t WD ) by connecting a specif-
ic value capacitor (C SWT ) between SWT and ground
(Figure 3). For normal-mode operation, calculate the
watchdog timeout capacitor as follows:
C SWT = t WD /2.67
where C SWT is in pF and t WD is in μs. C SWT must be a
low-leakage (< 10nA) type capacitor. Ceramic is
recommended.
Monitoring Voltages Other than V CC
The Typical Operating Circuit monitors V CC . Voltages
other than V CC can easily be monitored, as shown in
Figure 4. Calculate V RST as shown in the Reset
Threshold section.
Wake-Up Timer
In some applications, it is advantageous to put a μP
Figure 5. Wake-Up Timer
watchdog timeout period ends, a reset is applied on
the 80C51, waking it up to perform tasks. While the μP
is performing tasks, the 80C51 pulls WDS low (select-
ing normal mode), and the MAX6302 monitors the μP
for hang-ups. When the μP finishes its tasks, it puts
itself back into sleep mode, drives WDS high, and
starts the cycle over again. This is a power-saving tech-
nique, since the μP is operating only part of the time
and the MAX6302 has very low quiescent current.
Adding a Manual Reset Function
A manual reset option can easily be implemented by con-
necting a normally open momentary switch in parallel with
R2 (Figure 6). When the switch is closed, the voltage on
RESET IN goes to zero, initiating a reset. When the
switch is released, the reset remains asserted for the
reset timeout period and then is cleared. The pushbut-
ton switch is effectively debounced by the reset timer.
V CC
R1
into sleep mode, periodically wake it up to perform
checks and/or tasks, then put it back into sleep mode.
RESET IN
V CC
The MAX6301 family of supervisors can easily accom-
modate this technique. Figure 5 illustrates an example
using the MAX6302 and an 80C51.
In Figure 5, just before the μC puts itself into sleep
mode, it pulls WDS high. The μC’s I/O pins maintain
R2
MAX6301
MAX6302
MAX6303
MAX6304
0.1μF
their logic levels while in sleep mode and WDS remains
high. This places the MAX6302 in extended mode,
increasing the watchdog timeout 500 times. When the
Figure 6. Adding a Manual Reset Function
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6304CSA+ | 功能描述:监控电路 5V uPower 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 |
| MAX6304CSA+T | 功能描述:监控电路 5V uPower 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 |
| MAX6304CSA-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 |
| MAX6304CUA | 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 |
| MAX6304CUA+ | 功能描述:监控电路 5V uPower 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 |
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