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SN74LV273A: what is the inital OUTPUT state of SN74LV273

wang yao
Prodigy 10 points
Part Number: SN74LV273A

Hi,I have used SN74LV273 in my design,i have two questions

1.what is the inital state of Q output,in my design is high level output,even i put clear pin low for about 20ms after power on

2.in the datasheet table 2 of truth table,what mean by Q0,when clear is H,CLK is L and D is X?

3.what should I do when I want to Q = '0',in the condition of CLK is L,D is L ,CLEAR is L for 20ms  then H,after power on.

  • 0
    TI__Mastermind 43480 points
    Hi Yao,

    1. The initial state of any clocked device on power up is usually unknown or undefined until a valid clock signal comes in, but the clear pin should be making the output low.
    2.Qo is just the previous Q output since the device isn't being clocked.
    3.The clr pin should be making the output low, but you could also try putting a 0 at D and clocking the device.