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Q: TPS3820-33 source current by 788545
my customer is actually using TPS3820-33 to support a TMS470 uC.Due to sevaral reasons, they need to change to another derivative which has thus a higher internal pull down current of max. 185uA.
Unfortunately, TPS3820-33 is not able to support such high current from the datasheet.
Do we have a similar device with integrated watchdog and higher current capacbility? Also dual voltage reset would be ok.Do you see a change to adapt this device to the changed requirements with minimum effort?
Thanks in advance,
A: Re: TPS3820-33 source current by 313626
You didn't specify which TMS470 you are using but I check a couple of TMS470 datasheets for the reset specification. The reset pin of the TMS470 is a bi-directional signal. You must use a supervisor with an open collector or open drain output to avoid damaging parts. The TPS3820 has a push pull output and will cause problems. I recommend the TPS3828 instead.
Q: Re: TPS3820-33 source current by 788545
The TMS470 data sheet specifies a pull down current of max. 185uA while the TPS3820-33 has a high level output current of 30uA at 0.8xVDD. Does ot make sense or did I miss something?
I am not sure where you are getting the 185uA sink current specification. Both the electrical characteristics table and Figure 5 show the current capability to exceed 1.2mA. Please clarify or elaborate on your question.
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