SN74LS243

QUAD BUS TRANSCEIVER The SN54/ 74LS242 and SN54 / 74LS243 are Quad Bus Transmitters / Receivers designed for 4-line asynchronous 2-way data communications between data buses. SN54/74LS242 SN54/74LS243 Hysteresis at Inputs to Improve Noise Immunity 2-Way Asynchronous Data Bus Communication Input Clamp Diodes Limit High-Speed Termination Effects LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) SN54 / 74LS242 VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8 QUAD BUS TRANSCEIVER LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 632-08 14 1 1 GBA 2 NC 3 1A 4 2A 5 3A 6 4A 7 GND NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 14 1 N SUFFIX PLASTIC CASE 646-06 SN54 / 74LS243 VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8 14 1 D SUFFIX SOIC CASE 751A-02 ORDERING INFORMATION 1 GBA 2 NC 3 1A 4 2A 5 3A 6 4A 7 GND SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC TRUTH TABLES SN54 / 74LS242 INPUTS OUTPUT GAB L L H D L H X H L (Z) GAB L H H D X L H (Z) H L INPUTS OUTPUT GAB L L H D L H X L H (Z) INPUTS OUTPUT GAB L H H D X L H (Z) H L SN54/74LS243 INPUTS OUTPUT H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = HIGH Impedance FAST AND LS TTL DATA 5-393 SN54/74LS242 SN54/74LS243 GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current — High Parameter 54 74 54 74 54, 74 54 74 IOL Output Current — Low 54 74 Min 4.5 4.75 – 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 –...