3.5 cmos-ttl interfacing
DESCRIPTION
sdTRANSCRIPT
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3.5 CMOS/TTL Interfacing There are several factors to consider in TTL/CMOS interfacing, the first is noise margin; the next factor is fanout; the last factor is capacitive loading. For example : HC or HCT driving TTLConsidering fanout, an HC or HCT output can drive 10 LS or only 2 S-TTL inputs.
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3.5 CMOS/TTL Interfacing TTL driving HC or VHC TTL cant drive HC or VHC directly. RP=(3-5)K.