HD74AC240

HD74AC240/HD74ACT240 Octal Buffer/Line Driver with 3-State Output Description The HD74AC240/HD74ACT240 is an octal buffer and line driver designed to be employed as a memory address driver, clock driver and bus oriented transmitter or receiver which provides improved PC board density. Features 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers Outputs Source/Sink 24 mA HD74ACT240 has TTL-Compatible Inputs Pin Arrangement OE1 1 2 3 4 5 6 7 8 9 GND 10 (Top view) 20 VCC 19 OE2 18 17 16 15 14 13 12 11 HD74AC240/HD74ACT240 Truth Tables Inputs OE1 L L H D L H X Outputs (Pins 12, 14, 16, 18) H L Z Inputs OE2 L L H H L X Z : : : : High Voltage Level Low Voltage Level Immaterial High Impedance D L H X Outputs (Pins 3, 5, 7, 9) H L Z DC Characteristics (unless otherwise specified) Item Maximum quiescent supply current Maximum quiescent supply current Maximum additional ICC/input (HD74ACT240) Symbol I CC I CC I CCT Max 80 8.0 1.5 Unit µA µA mA Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C VIN = VCC – 2.1 V, VCC = 5.5 V, Ta = Worst case 2 HD74AC240/HD74ACT240 AC Characteristics: HD74AC240 Ta = +25°C CL = 50 pF Item Propagation delay Data to output Propagation delay Data to output Output enable time t PZH t PHL Symbol t PLH VCC (V)*1 3.3 5.0 3.3 5.0 3.3 5.0 Output enable time t PZL 3.3 5.0 Output disable time t PHZ 3.3 5.0 Output disable time t PLZ 3.3 5.0 Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V ...