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who can help me about POR

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engronger

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now i want to design a power on reset circuit , here is the spec

current dissipation : <1uA
power supply : 1.8~3.3V
trigger point : 1.3V

who can give me a structure can meet this ?
thank you !
 

paley

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how about the accuracy of the trigger point in the spec?
 

gte582w

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you will need some comparator with hysteresis built
into it. Notice now, the input is the supply itself.
 

reg_ic

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it is very easy for this por ,you need some digital ckt is ok ,no need for the comparator from the point of current comsuption ! and maybe your trigger precision is between 100--50mV
 

pfd001

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it is not easy to get a precision trig point. How much tolerance of the trig poion?
 

rfzheng

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you need a feedback to shut down the por and then it will cons
ume a little current
 

pmr9

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first thing is comparator and canb designed with low power consumption thats not a problem. Hyaterisis ll be around 50-20mv based on ur application. Ur trigger pt=1.3 so u can use nmos diffpair at input. U didnt mentioned del time in ur spec?
 

reg_ic

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using some inverter and a smitter trigger and switching mosfet and some resistor is ok to get the por!ieee have some paper about this topic!
 

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