74LS645 Datasheet | onsemi

SN74LS640 SN74LS641 SN74LS642 SN74LS645 Octal Bus Transceivers These octal bus transceivers are designed for asynchronous two-way munication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission 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 LS640 LS641 LS642 LS645 OUTPUT 3-State Open-Collector Open-Collector 3-State LOGIC Inverting True Inverting True http://onsemi. LOW POWER SCHOTTKY FUNCTION TABLE CONTROL INPUTS G L L H DIR L H X LS640 LS642 B data to A bus A data to B bus Isolation OPERATION LS641 LS645 B data to A bus A data to B bus Isolation 20 1 PLASTIC N SUFFIX CASE 738 H = HIGH Level, L = LOW Level, X = Irrelevant 20 GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645) Symbol VCC TA IOH Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 3.0 - 15 IOL Output Current - Low 24 Unit V °C m A m A m A SOIC DW SUFFIX CASE 751D ORDERING INFORMATION Device SN74LS640N SN74LS640DW SN74LS641N Package 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin 16 Pin DIP 16 Pin Shipping 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel 1440 Units/Box 2500/Tape & Reel GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642) Symbol VCC TA VOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Voltage - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 5.5 24 Unit V °C V m A SN74LS641DW SN74LS642N SN74LS642DW SN74LS645N SN74LS645DW © Semiconductor ponents Industries, LLC, 1999 December, 1999 - Rev. 6 Publication Order Number: SN74LS640/D SN74LS640 SN74LS641 SN74LS642 SN74LS645 CONNECTION DIAGRAMS DIP (TOP VIEW) ENABLE B1 VCC G 20 19 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 VCC 20 ENABLE B1 G...