- 您现在的位置：买卖IC网 > PDF目录229276 > MAX6830WDUT-T (MAXIM INTEGRATED PRODUCTS INC) Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer PDF资料下载
参数资料
| 型号： | MAX6830WDUT-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| 中文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 12/12页 |
| 文件大小： | 205K |
| 代理商： | MAX6830WDUT-T |
outputs. Connect a normally open momentary switch
from MR to GND to create a manual-reset function;
external debounce circuitry is not required. If MR is dri-
ven from long cables or the device is used in a noisy
environment, connect a 0.1F capacitor from MR to
GND to provide additional noise immunity.
Watchdog Input
The watchdog circuit monitors the P’s activity. If the
P does not toggle (low to high or high to low) the
watchdog input (WDI) within the watchdog timeout peri-
od (1.6s nominal), reset asserts for the reset timeout
period. The internal 1.6s timer can be cleared by either
a reset pulse or by toggling WDI. The WDI can detect
pulses as short as 50ns. While reset is asserted, the
timer remains cleared and does not count. As soon as
reset is released, the timer starts counting (Figure 4).
Disable the watchdog function by leaving WDI uncon-
nected or by three-stating the driver connected to WDI.
The watchdog input is internally driven low during the
first 7/8 of the watchdog timeout period and high for the
last 1/8 of the watchdog timeout period. When WDI is left
unconnected, this internal driver clears the 1.6s timer
every 1.4s. When WDI is three-stated or unconnected,
the maximum allowable leakage current is 10A and the
maximum allowable load capacitance is 200pF.
Adjustable Reset Thresholds
The MAX6826/MAX6827/MAX6828 provide a user
adjustable input to monitor a second voltage. The
threshold voltage at RSTIN is typically 0.63V. To moni-
tor a voltage higher than 0.63V, connect a resistor-
divider to the circuit as shown in Figure 5. The
threshold at VMONITOR is:
Note that RSTIN is powered by VCC, and its voltage
must therefore remain lower than VCC.
Applications Information
Watchdog Input Current
The WDI inputs are internally driven through a buffer
and series resistor from the watchdog timer (Figure 1).
When WDI is left unconnected, the watchdog timer is
serviced within the watchdog timeout period by a low-
high-low pulse from the counter chain. For minimum
watchdog input current (minimum overall power con-
sumption), leave WDI low for the majority of the watch-
dog timeout period, pulsing it low-high-low once within
the first 7/8 of the watchdog timeout period to reset the
watchdog timer. If WDI is externally driven high for the
majority of the timeout period, up to 160A can flow into
WDI.
Interfacing to Ps
with Bidirectional Reset Pins
Since the RESET output on the MAX6828/MAX6831
is open drain, these devices interface easily with Ps
that have bidirectional reset pins, such as the Motorola
68HC11. Connecting the P supervisor’s RESET output
VV
RR
R
MONITOR TRIP
_
.
=
+
063
12
2
MAX6826
–MAX6831
Dual Ultra-Low-Voltage SOT23 P Supervisors
with Manual Reset and Watchdog Timer
_______________________________________________________________________________________
9
Figure 5. Monitoring a Voltage
VMONITOR
R1
R2
VCC
≥ VRSTIN
RSTIN
MAX6826
MAX6827
MAX6828
VCC
tWD
tRP
tRST
WDI
RESET*
*RESET IS THE INVERSE OF RESET.
Figure 4. Watchdog Timing Relationship
Figure 6. Interfacing Open-Drain RESET to Ps with
Bidirectional Reset I/O
MAX6828
MAX6831
RESET
GENERATOR
GND
VCC
RESET
P
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6830WEUT-T | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| MAX6830WFUT-T | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| MAX6830WGUT-T | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| MAX6830WHUT-T | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| MAX6830WIUT-T | Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6830WEUT | 制造商:Maxim Integrated Products 功能描述:DUAL ULTRA LOW VOLTAGE SOT23 MICROP - Cut Tape Product |
| MAX6830WEUT+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 |
| MAX6830WEUT-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 |
| MAX6830WFUT | 制造商:Maxim Integrated Products 功能描述:DUAL ULTRA LOW VOLTAGE SOT23 MICROP - Cut Tape Product |
| MAX6830WFUT+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 |
发布紧急采购，3分钟左右您将得到回复。