yefj
Advanced Member level 4
Hello , I am connecting 0-3.3V pulse as an input to DS1110S.
pullup current is 1mA pull down is 12mA also it was said that it could drive 10 74LS type loads as shown below.
because the pull up current is drastickly lower i think we need to use pull up resistor.
My load is 74ABT04 with input capactiance is 3pF.
1.what is the capacitance of typical 74LS device?
2.I was told that if i connect 74ABT04 to the output of DS1110S the i dont need pullup resistor between them.
Why is that? I know we have a formula I=CdV/dt.
How can we know that we dont need pullup resistor?
Thanks.
https://www.analog.com/media/en/technical-documentation/data-sheets/DS1110.pdf
https://assets.nexperia.com/documents/data-sheet/74ABT04.pdf
pullup current is 1mA pull down is 12mA also it was said that it could drive 10 74LS type loads as shown below.
because the pull up current is drastickly lower i think we need to use pull up resistor.
My load is 74ABT04 with input capactiance is 3pF.
1.what is the capacitance of typical 74LS device?
2.I was told that if i connect 74ABT04 to the output of DS1110S the i dont need pullup resistor between them.
Why is that? I know we have a formula I=CdV/dt.
How can we know that we dont need pullup resistor?
Thanks.
https://www.analog.com/media/en/technical-documentation/data-sheets/DS1110.pdf
https://assets.nexperia.com/documents/data-sheet/74ABT04.pdf