why 74xx series ic used in electronic boards

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You mean, with which are made uCs ?

CMOS for inner logics
TTL for external interface
 

abc_de said:
No I mean to say which logic gamily is best suit for microcontroller output purpose
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Don't matter, both electrical standards are compatible with each other.
You can plug any kind of gates at uC I/Os, irrespective whether are TTL or CMOS type.
 
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