74LS243

DM74LS243 Quadruple Bus Transceiver August 1986 Revised January 2000 DM74LS243 Quadruple Bus Transceiver General Description This four data line transceiver is designed for asynchronous two-way communications between data buses. It can be used to drive terminated lines down to 133Ω. Features s Two-way asynchronous communication between data buses s PNP inputs reduce DC loading on bus line s Hysteresis at data inputs improves noise margin Ordering Code: Order Number DM74LS243M DM74LS243N Package Number M14A N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Control Inputs G AB H L H L I = Input O = Output H = HIGH Logic Level L = LOW Logic Level Note 1: Possibly destructive oscillation may occur if the transceivers are enabled in both directions at once. Data Port Status GBA H H L L I A O (Note 1) ISOLATED O B I (Note 1) © 2000 Fairchild Semiconductor Corporation DS006412 www.fairchildsemi.com DM74LS243 Absolute Maximum Ratings(Note 2) Supply Voltage Input Voltage Any G A or B Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 0°C to +70°C −65°C to +150°C 7V Note 2: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should...