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SN74LVC1G06: SN74LVC1G06

TAlex Wu
Expert 1130 points
Part Number: SN74LVC1G06

Dear SIR:

May I have question and double confirming regarding SN74LVC1G06 as below:.

According to SN74LVC1G06 spec. mention that " VCC MIN =1.65V ,MAX =5.5V  ;  

                                                                               "When VCC = 1.65 V to 1.95 V ==>VIH MIN =0.65 × VCC ; VIL MAX =0.35 × VCC . "

                                                                              " When VCC = VCC = 3 V to 3.6 V ==>VIH MIN =2V           ; VIL MAX =0.8.V "

If  we know the condition (A) "Input =1.8V =High ,0V=Low" ,base on above ,Is that meaning we need provide SN74LVC1G06's VCC =1.8V ,Right ?

Another condition (B)   "Input =1.8V =High ,0V=Low" OR  "Input =Unknow (Maybe=3.3V)  =High ,0V=Low"  ,base on above ,Is that meaning we still need provide SN74LVC1G06 VCC =1.8V ,Right ?

                                      ( Because If We  provide SN74LVC1G06  VCC =3.3V ,When "Input =Unknow (Maybe=3.3V)  =High ,0V=Low" will work ,but when   "Input =1.8V =High ,0V=Low" SN74LVC1G06

                                       will not work ,Right ? )

Figure as below:

  • 0
    TI__Guru* 96947 points
    Hi TAlex,
    Where is the "unknown" signal coming from? If it's on the same board, then you must have that "2.5-3.3V" supply available, in which case I would recommend supplying the SN74LVC1G06 from that.

    If it's coming from a different board and you don't have that supply available, then you can use the 1.8V supply and it will work without any problems. Essentially, the supply to the SN74LVC1G06 only controls the input thresholds. As long as your input is below the 1.8V "low" threshold the device will output "high" and as long as your input is above the 1.8V "high" threshold, the device will output "low." Note that you also must remain within the device's recommended input voltage range.
  • 0 in reply to Emrys Maier
    Expert 1130 points

    Dear SIR:

    Thank for your reply.

    Sorey,I don't understanding your meaning in detail. 

    Is that your meaning regarding the Figure. condition(A) VCC recommend =1.8V ?

    Is that your meaning regarding the Figure. condition(B) VCC recommend =3.3V ? 

    (Even Figure. condition(B) Input signal sometime voltage level High is 1.8V and sometime voltage level High is 2.5V and sometime voltage level High is 3.3V ,)

    Thanks

  • 0 in reply to TAlex Wu
    TI__Guru* 96947 points
    No, I asked you questions regarding your circuit because you didn't share everything I needed to know. I have simplified my questions:

    Where does the 2.5-3.3V signal come from?

    What power rails are available on your board/in your system?
  • 0 in reply to Emrys Maier
    Expert 1130 points

    Dear SIR:

    Thank for your reply.

    Reply as below:

    Where does the 2.5-3.3V signal come from?

    <Reply>==>1.8v signal or  2.5-3.3V signal come from another Main Board.But the Main Board maybe will be change to Main Board A(1.8v signal) or Main Board B (2.5-3.3V signal) 

    What power rails are available on your board/in your system?

    <Reply>==>So far we make sure have 1.8V ,other's just  confirming by the Forum question  for this board (Small Board A).

                        1.8v  power rails  available  for Main Board A

                        2.5-3.3V power rails  available  for Main Board B

                        1.8v  power rails  available  for  Small Board B [End Device]

                        Total  power rails  available 1.8V ,2.5-3.3V power rails in the System [Either "Main Board A or Main Board B" ------->Small Board A------>Small Board B ] .

                        (But, Main Board A and Main Board B will base on different condition to exchange ,Change another word: Main Board A and Main Board B either one in the System )

                         Main Board A==>Design by Customer A 

                         Main Board B==>Design by Customer B 

  • 0 in reply to TAlex Wu
    TI__Guru* 96947 points
    Thank you for explaining.

    In this case, I would recommend using 1.8V supply for the SN74LVC1G06. It has over-voltage tolerant inputs, so the 2.5-3.3V inputs will not cause any problems. This will work in both condition (a) and condition (b) listed above.
  • 0 in reply to Emrys Maier
    Expert 1130 points
    Dear SIR:

    Thanks for your reply.