SN74LVC1G06: SN74LVC1G06

TAlex Wu

Expert 1100 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:

over 5 years ago

0 Emrys Maier over 5 years ago

TI__Guru* 96591 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 TAlex Wu over 5 years ago in reply to Emrys Maier

Expert 1100 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 Emrys Maier over 5 years ago in reply to TAlex Wu

TI__Guru* 96591 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 TAlex Wu over 5 years ago in reply to Emrys Maier

Expert 1100 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 Emrys Maier over 5 years ago in reply to TAlex Wu

TI__Guru* 96591 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 TAlex Wu over 5 years ago in reply to Emrys Maier

Expert 1100 points

Dear SIR:

Thanks for your reply.

Logic

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SN74LVC1G06: SN74LVC1G06