HD74HC242

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 pF) 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 HD74HC242 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) 2 HD74HC242/HD74HC243 Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage DC current drain per pin DC current drain per VCC, GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating –0.5 to +7.0 –0.5 to VCC + 0.5 –0.5 to VCC + 0.5 ±35 ±75 ±20 ±20 500 ...