54F646 Datasheet | National Semiconductor

Obsolete 54F 74F646 74F646B 54F 74F648 Octal Transceiver Register with TRI-STATE Outputs December 1994 54F 74F646 74F646B 54F 74F648 Octal Transceiver Register with TRI-STATE Outputs General Description These devices consist of bus transceiver circuits with TRISTATE D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a high logic level Control G and direction pins are provided to control the transceiver function In the transceiver mode data present at the high impedance port may be stored in either the A or the B register or in both The select controls can multiplex stored and real-time (transparent mode) data The direction control determines which bus will receive data when the enable control G is Active LOW In the isolation mode (control G HIGH) A data may be stored in the B register and or B data may be stored in the A register Features Y Independent registers for A and B buses Y Multiplexed real-time and stored data Y ’F648 has inverting data paths Y ’F646 ’F646B have non-inverting data paths Y ’F646B is a faster version of the ’F646 Y TRI-STATE outputs Y 300 mil slim DIP Y Guaranteed 4000V minimum ESD protection mercial 74F646SPC 74F646SC (Note 1) 74F646MSA (Note 1) 74F646BSPC 74F646BSC (Note 1) 74F648SPC 74F648SC (Note 1) Military 54F646DM (Note 2) 54F646FM (Note 2) 54F646LM (Note 2) 54F648SDM (Note 2) 54F648FM (Note 2) 54F648LM (Note 2) Package Number N24C J24F M24B MSA24 W24C E28A N24C M24B N24C J24F M24B W24C E28A Package Description 24-Lead (0 300 Wide) Molded Dual-In-Line 24-Lead (0 300 Wide) Ceramic Dual-In-Line 24-Lead (0 300 Wide) Molded Small Outline JEDEC 24-Lead Molded Shrink Small Outline EIAJ Type II 24-Lead Cerpack 28-Lead Ceramic Leadless Chip Carrier Type C 24-Lead (0 300 Wide) Molded Dual-In-Line 24-Lead (0 300 Wide) Molded Small Outline...