HD74HC242 Datasheet | Hitachi Semiconductor

HD74HC242/HD74HC243 Quad. Bus Transceivers (with 3-state outputs) Quad. Bus Transceivers (with noninverted 3-state outputs) Description The HD74HC242 is an inverting buffer and the HD74HC243 is a noninverting buffer. Each device has one active high enable (GBA), and one active low enable ( GAB). GBA enables the A output and GAB enables the B outputs. The device does not have schmitt trigger inputs. Features - - - - - High Speed Operation: tpd = 10 ns typ (CL = 50 p F) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table HD74HC242 Control inputs GAB H L H L I O O Z : : : : GBA H H L L Input Output Inverting Output Hight Impedance Data Port Status A O Z Z I B I Z Z O HC74HC243 Data Port Status A O Z Z I B I Z Z O HD74HC242/HD74HC243 Pin Arrangement GAB NC 1A 2A 3A 4A GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC GBA NC 1B 2B 3B 4B (Top view) HD74HC243 GAB NC 1A 2A 3A 4A GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC GBA NC 1B 2B 3B 4B (Top view) HD74HC242/HD74HC243...