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SN74LS642DW Datasheet(PDF) 1 Page - Motorola, Inc |
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SN74LS642DW Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 3 page CONNECTION DIAGRAMS DIP (TOP VIEW) 18 17 16 15 14 13 1 2 3 4 5 6 7 20 19 8 VCC DIR B1 B2 B3 B5 B4 B6 A1 A2 A3 A4 A5 A6 A7 9 10 A8 GND 12 11 B7 B8 18 17 16 15 14 13 1 2 3 4 5 6 7 20 19 8 VCC DIR B1 B2 B3 B5 B4 B6 A1 A2 A3 A4 A5 A6 A7 9 10 A8 GND 12 11 B7 B8 SN54 / 74LS640 SN54 / 74LS642 SN54 / 74LS641 SN54 / 74LS645 ENABLE G ENABLE G 5-1 FAST AND LS TTL DATA OCTAL BUS TRANSCEIVERS These octal bus transceivers are designed for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmis- sion from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G) can disable the device so that the buses are effectively isolated. DEVICE OUTPUT LOGIC LS640 3-State Inverting LS641 Open-Collector True LS642 Open-Collector Inverting LS645 3-State True FUNCTION TABLE CONTROL INPUTS OPERATION INPUTS LS640 LS642 LS641 LS645 G DIR LS640 LS642 LS641 LS645 L L B data to A bus B data to A bus L H A data to B bus A data to B bus H X Isolation Isolation H = HIGH Level, L = LOW Level, X = Irrelevant SN54/74LS640 SN54/74LS641 SN54/74LS642 SN54/74LS645 OCTAL BUS TRANSCEIVERS LOW POWER SCHOTTKY ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 |
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