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| 型号： | MAX16998BAUA/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC TIMER WATCHDOG 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 监视器电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
High-Voltage Watchdog Timers with
Adjustable Timeout Delay
Interfacing to Other Voltages for
Logic Compatibility
As shown in Figure 9, the open-drain RESET output can
operate in the 2.5V to 18V range. This allows the device
to interface a μP with other logic levels.
WDI Glitch Immunity
For additional glitch immunity, connect an RC lowpass
filter as close as possible to WDI (see Figure 10).
For example, for glitches with duration of 1μs, a 12k ?
resistor and a 47pF capacitor will provide immunity.
Layout Considerations
SRT and SWT are connected to internal precision cur-
rent sources. When developing the layout for the appli-
cation, minimize stray capacitance attached to SRT
and SWT as well as leakage currents that can reach
those nodes. SRT and SWT traces should be as short
as possible. Route traces carrying high-speed digital
signals and traces with large voltage potentials as far
from SRT and SWT as possible. Leakage currents and
stray capacitance (e.g., a scope probe, which induces
both) at these pins may cause errors in the reset and/or
watchdog timeout period. When evaluating these parts,
use clean prototype boards to ensure accurate reset
and watchdog timeout periods.
RESETIN is a high-impedance input and a high-imped-
ance resistive divider (e.g., 100k ? to 1M ? ) sets the
threshold level. Minimize coupling to transient signals
by keeping the connections to this input short. Any DC
leakage current at RESETIN (e.g., a scope probe)
causes errors in the programmed reset threshold.
Typical Operating Circuits
RESET remains asserted as long as RESETIN is below
the regulated voltage and for the reset timeout period
after RESETIN goes high to assure that the monitored
LDO voltage is settled. Then, the μC starts operating
and triggers WDI.
If the μC fails to operate correctly (e.g., the software
execution is stuck in a loop), the WDI signal does not
trigger the watchdog timer any more, and RESET is
pulled low, resetting the μC. If the μC does not work
properly in the next loop either, the device asserts
RESET again. After three watchdog timeout periods
with no WDI falling edges, ENABLE asserts and flags
backup or safety circuits that take over the operation.
5V TO 40V
IN
2.5V TO 18V
IN
MAX16998A/B/D
10k ?
V CC
MAX16998A/B/D
V CC
RESET
RESET
N
μ P
WDI
R
I/O
μ P
C
GND
Figure 9. Interfacing to Other Voltage Levels
GND
GND
Figure 10. Additional WDI Glitch Immunity Circuit
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16998DAUA/V+ | 功能描述:监控电路 Watchdog Timer w/Adj Timeout Delay 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 |
| MAX16998DAUA/V+T | 功能描述:监控电路 Watchdog Timer w/Adj Timeout Delay 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 |
| MAX16998DAUA+ | 功能描述:监控电路 Watchdog Timer w/Adj Timeout Delay 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 |
| MAX16998DAUA+T | 功能描述:监控电路 Watchdog Timer w/Adj Timeout Delay 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 |
| MAX16999AUA05+ | 功能描述:线性稳压器 - 标准 Low Out V Low-Q for High-Temp Aps RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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