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| 型号： | MAX6746KA16+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC RESET MPU W/ADJ RESET SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 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： | 可调节/可选择 |
| 电压 - 阀值： | 1.575V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 产品目录页面： | 1417 (CN2011-ZH PDF) |
| 其它名称： | MAX6746KA16+TDKR |
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
WDI
RESET
t WDI < t WD1 (MIN)
5V
V CC
MAX6747
MAX6749
MAX6451
MAX6753
100k Ω
3.3V
V CC
(a) FAST FAULT
RESET
RESET
μ P
N
t WDI > t WD2 (MAX)
GND
GND
WDI
Figure 6. Interfacing to Other Voltage Levels
RESET
normal mode operation, calculate the watchdog time-
(b) SLOW FAULT
t WD1 (MAX) < t WDI < t WD2 (MIN)
WDI
RESET
(c) NORMAL OPERATION (NO PULSING, OUTPUT STAYS HIGH)
Figure 5. MAX6752/MAX6753 Window Watchdog Diagram
Applications Information
Selecting Reset/Watchdog
Timeout Capacitor
The reset timeout period is adjustable to accommodate
a variety of μP applications. Adjust the reset timeout
period (t RP ) by connecting a capacitor (C SRT ) between
SRT and ground. Calculate the reset timeout capacitor
as folllows:
C SRT = t RP / (5.06 x 10 6 )
with t RP in seconds and C SRT in Farads.
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 GND. For
10
out capacitor as follows:
C SWT = t WD /(5.06 x 10 6 )
with t RP in seconds and C SRT in Farads.
For the MAX6752 and MAX6753 windowed watchdog
function, calculate the slow watchdog period, t WD2 as
follows:
t WD2 = 0.65 x 10 9 x C SWT
C SRT and C SWT must be a low-leakage (< 10nA) type
capacitor. Ceramic capacitors are recommended.
Transient Immunity
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these supervi-
sors are relatively immune to short-duration supply tran-
sients (glitches). The Maximum Transient Duration vs.
Reset Threshold Overdrive graph in the Typical
Operating Characteristics shows this relationship.
The area below the curves of the graph is the region
in which these devices typically do not generate a reset
pulse. This graph was generated using a falling pulse
applied to V CC , starting above the actual reset threshold
(V TH ) and ending below it by the magnitude indicated
(reset-threshold overdrive). As the magnitude of the tran-
sient increases (farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, a
V CC transient that goes 100mV below the reset threshold
and lasts 50μs or less does not cause a reset pulse to be
issued.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6746KA17 | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Rail/Tube |
| MAX6746KA17+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 |
| MAX6746KA17-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 |
| MAX6746KA18 | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR RESET CIRCUITS WITH - Rail/Tube |
| MAX6746KA18+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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