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MAX6319LHUK32A-T

更新时间： 2023-08-15 00:00:00
品牌 Logo 应用领域
美信 - MAXIM 光电二极管
页数 文件大小 规格书
14页 1516K
描述
Power Supply Support Circuit, Fixed, 1 Channel, +3.2VV, PDSO5, SOT-23, 5 PIN

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MAX6319LHUK32A-T 数据手册

 浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第7页浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第8页浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第9页浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第11页浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第12页浏览型号MAX6319LHUK32A-T的Datasheet PDF文件第13页 
MAX6316–MAX6322  
5-Pin μP Supervisory Circuits with  
Watchdog and Manual Reset  
V
CC  
t
RST  
V
CC  
MAX6316  
MAX6318  
MAX6319  
RESET  
t
RP  
t
t
RP  
WD  
V
CC  
WDI  
GND  
RESET  
100kΩ  
MAX6316/MAX6317  
MAX6318/MAX6320  
MAX6321  
Figure 7. Watchdog Timing Relationship  
Figure 8. Ensuring RESET Valid to V  
Push/Pull and Bidirectional Outputs  
= 0V on Active-Low  
CC  
Applications Information  
Watchdog Input Current  
MAX6317  
MAX6318  
MAX6319  
MAX6321*  
MAX6322*  
The WDI input is internally driven through a buffer and  
series resistor from the watchdog counter. For minimum  
watchdog input current (minimum overall power con-  
sumption), leave WDI low for the majority of the watchdog  
timeout period. When high, WDI can draw as much as  
160μA. Pulsing WDI high at a low duty cycle will reduce  
the effect of the large input current. 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.  
V
CC  
100kΩ  
V
CC  
GND  
RESET  
*THIS SCHEMATIC DOES NOT WORK ON THE OPEN-DRAIN  
OUTPUTS OF THE MAX6321/MAX6322.  
Negative-Going VCC Transients  
These supervisors are immune to short-duration, negative-  
Figure 9. Ensuring RESET Valid to V  
Push/Pull Outputs  
= 0V on Active-High  
CC  
going V transients (glitches), which usually do not require  
CC  
the entire system to shut down. Typically, 200ns large-  
scheme does not work with the open-drain outputs of the  
MAX6320/MAX6321/MAX6322. The resistor value used  
is not critical, but it must be large enough not to load the  
amplitude pulses (from ground to V ) on the supply will  
CC  
not cause a reset. Lower amplitude pulses result in greater  
immunity. Typically, a V transient that goes 100mV under  
CC  
reset output when V  
is above the reset threshold. For  
CC  
the reset threshold and lasts less than 4μs will not trigger a  
reset. An optional 0.1μF bypass capacitor mounted close to  
most applications, 100kΩ is adequate.  
V
provides additional transient immunity.  
CC  
Watchdog Software Considerations  
(MAX6316/MAX6317/MAX6318/  
MAX6320/MAX6321)  
Ensuring Valid Reset Outputs  
Down to V = 0V  
CC  
One way to help the watchdog timer monitor software  
execution more closely is to set and reset the watchdog  
input at different points in the program, rather than puls-  
ing the watchdog input high-low-high or low-high-low. This  
technique avoids a stuck loop, in which the watchdog  
timer would continue to be reset inside the loop, keeping  
the watchdog from timing out.  
The MAX6316_/MAX6317H/MAX6318_H/MAX6319_H/  
MAX6321HP/MAX6322HP are guaranteed to operate  
properly down to V  
= 1V. In applications that require  
CC  
valid reset levels down to V  
= 0V, a pulldown resistor to  
CC  
active-low outputs (push/pull and bidirectional only, Figure  
8) and a pullup resistor to active-high outputs (push/pull  
only, Figure 9) will ensure that the reset line is valid while  
the reset output can no longer sink or source current. This  
Maxim Integrated  
│ 10  
www.maximintegrated.com  
1...7891011121314

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