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Original question:

TLC555 or TPL5010: reference design for 8 hours waiting

SN74LV163A: Max ICC is 20uA, I don't know the typical, no clocking

Ron Michallick
Guru**** 165366 points
Part Number: SN74LV163A
Other Parts Discussed in Thread: SN74HCS164, TPL5010

Tool/software:

I need to count 5 pulses evenly spaced over 8 hours then output a signal. There is no typical IQ. What is typical ICC. 

Second question, is this the best logic device to do this task.  

  • 0
    TI__Mastermind 38545 points

    Hi Ron,

    1. To be honest, there is not really a good way to find this information out anymore. I took a look in our database and wasn't able to find anything. I am assuming this is because the device is so old. 

    2. It does sound like a simple counter is enough for this. Do you have anymore specs of the system needed? 
    Otherwise,  you can also look into our new TPLD devices, but these may be too much for this usecase.  

  • +1
    Guru 317390 points

    1. ICC is just leakage current, which is very temperature dependent. At room temperature, it is orders of magnitude smaller than the maximum. (The AUP logic family is optimized for lower currents, but has no counters.)

    2. Are the pulses active high or active low? When exactly should the output go high, and when low? It might be possible to create a shift register from five flip-flops.

  • 0 in reply to Clemens Ladisch
    TI__Guru**** 165366 points

    Thanks Albert and Clemens,

    It turns out that ICC doesn't matter at all. The CPU is running the whole time, but for some unknown reason can keep track of 8 hours on its own.

    An eight bit SR, SN74HCS164, is easier to setup due to async clear from CPU that'll also clear the 2 hour TPL5010 timer. Qe will go high after the 5th TPL5010 output.