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MAX6864UK16D5L+

更新时间： 2023-08-15 00:00:00
品牌 Logo 应用领域
美信 - MAXIM 信息通信管理光电二极管
页数 文件大小 规格书
17页 489K
描述
Power Supply Management Circuit, Fixed, 1 Channel, BICMOS, PDSO5, LEAD FREE, MO-178AA, SOT-23, 5 PIN

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MAX6864UK16D5L+ 数据手册

 浏览型号MAX6864UK16D5L+的Datasheet PDF文件第9页浏览型号MAX6864UK16D5L+的Datasheet PDF文件第10页浏览型号MAX6864UK16D5L+的Datasheet PDF文件第11页浏览型号MAX6864UK16D5L+的Datasheet PDF文件第13页浏览型号MAX6864UK16D5L+的Datasheet PDF文件第14页浏览型号MAX6864UK16D5L+的Datasheet PDF文件第15页 
Nanopower µP Supervisory Circuits with  
Manual Reset and Watchdog Timer  
open-drain output to level-shift from the monitored sup-  
ply to reset circuitry powered by another supply voltage.  
Keep in mind that as the supervisor’s V decreases,  
Transient Immunity  
In addition to issuing a reset to the µP during power-up,  
power-down, and brownout conditions, the MAX6854/  
MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 are  
relatively immune to short-duration supply transients, or  
CC  
so does the IC’s ability to sink current at RESET.  
Ensuring a Valid RESET Down to V  
= 0V  
CC  
glitches. The Maximum V  
Transient Duration vs. Reset  
CC  
(Push-Pull RESET)  
Threshold Overdrive graph in the Typical Operating  
Characteristics shows this relationship.  
When V  
falls below 1.1V, RESET’s current-sinking  
CC  
capability declines drastically. The high-impedance  
CMOS logic inputs connected to RESET can drift to  
undetermined voltages. This presents no problems in  
most applications, since most µPs and other circuitry  
The area below the curve 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 , starting 100mV above the actual reset  
CC  
do not operate with V  
below 1.1V.  
CC  
threshold, V , and ending below this threshold (reset-  
TH  
In those applications where RESET must be valid down  
to 0, add a pulldown resistor between RESET and GND  
for the MAX6854/MAX6858/MAX6861/MAX6864/  
MAX6867 push-pull outputs. The resistor sinks any stray  
leakage currents, holding RESET low (Figure 5). Choose  
a pulldown resistor that accommodates leakages, such  
that RESET is not significantly loaded and is capable of  
pulling to GND. The external pulldown cannot be used  
with the open-drain reset outputs.  
threshold overdrive). As the magnitude of the transient  
increases, the maximum allowable pulse width  
decreases. Typically, a 100mV V  
transient duration  
CC  
of 40µs or less does not cause a reset.  
Interfacing to Other Voltages for Logic  
Compatibility  
The open-drain RESET output can be used to interface  
to a µP with other logic levels. As shown in Figure 4, the  
open-drain output can be connected to voltages from 0  
to 5.5V.  
Watchdog Software Considerations  
One way to help the watchdog timer monitor software  
execution more closely is to set and reset the watchdog  
Generally, the pullup resistor connected to RESET con-  
nects to the supply voltage that is being monitored at  
the IC’s V  
input. However, some systems use the  
CC  
V
CC  
1.8V  
3.3V  
V
CC  
V
CC  
MAX6856  
MAX6860  
MAX6863  
MAX6866  
MAX6869  
100kΩ  
MAX6854  
MAX6858  
MAX6861  
MAX6864  
MAX6867  
V
CC  
RESET  
µP  
RESET  
N
RESET  
2MΩ  
GND  
GND  
GND  
Figure 5. Ensuring RESET Valid to V  
= Ground  
Figure 4. Interfacing with Other Voltage Levels  
CC  
12 ______________________________________________________________________________________  
1...9101112131415...17

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