Hi,
Sorry if this is a stupid question but, when there is a need to tie unused IC pins to either +ve or -ve, are they meant to be directly connected, or should they be connected via a current limiting resistor? I ask because I need to limit the current draw of a circuit I'm designing because it is powered by a battery and I want it to last as long as possible.
For example, my circuit uses a CMOS 4013 Dual D-type flip-flop and I need to tie the SET and RESET pins to -ve. The datasheet says that the maximum input sink/source current is 10mA so I chose to limit the used inputs and outputs to around 5mA, but I'm not sure what to do about the unused ones.
Another question arose from my ponderings about this - what is the minimum current I could use to reliably trigger the inputs of the 4013? Could I go down as far as 1mA... or even less? The datasheet only gives a maximum.
Thanks,
John.
Sorry if this is a stupid question but, when there is a need to tie unused IC pins to either +ve or -ve, are they meant to be directly connected, or should they be connected via a current limiting resistor? I ask because I need to limit the current draw of a circuit I'm designing because it is powered by a battery and I want it to last as long as possible.
For example, my circuit uses a CMOS 4013 Dual D-type flip-flop and I need to tie the SET and RESET pins to -ve. The datasheet says that the maximum input sink/source current is 10mA so I chose to limit the used inputs and outputs to around 5mA, but I'm not sure what to do about the unused ones.
Another question arose from my ponderings about this - what is the minimum current I could use to reliably trigger the inputs of the 4013? Could I go down as far as 1mA... or even less? The datasheet only gives a maximum.
Thanks,
John.