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PostPosted: Tue Sep 11, 2018 7:00 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 7541
Location: Seattle
nocash wrote:
About racermate, using 74xx logic powered by battery... is that good for battery lifetime? Or is it only powering the transistor part from battery?
If it were actual TTL ICs, it'd be bad. But 74HC's quiescent current is pretty small, comparable to the SRAMs'.

(On Racermate, it's the 74HCT74 and one of the two 74HCT32. The other logic ICs are powered by +5V )


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