s Independent registers for A and B buses s Multiplexed real-time and stored data s 74F648 has inverting data paths s 74F646/74F646B have non-inverting data paths s 74F646B is a faster version of the 74F646 s 3-STATE outputs s 300 mil slim DIP Ordering Code: Order Number 74F646SC 74F646MSA 74F646SP.