HD74HCT242

HD74HCT242/HD74HCT243 Quad. Bus Transceivers (with 3-state outputs) Description The HD74HCT242 is an inverting buffer and the HD74HCT243 is a noninverting buffer. Each device has one active high enable (GBA), and one active low enable (GAB). GBA enables the A outputs and GAB enables the B outputs. The device does not have schmitt trigger inputs. Features LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to Y) = 9.5 ns typ (C L = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 4.5 to 5.5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table HD74HCT242 Control Inputs GAB H L H L I O O Z : : : : GBA H H L L Input Output Inverting Output High Impedance Data Port Status A O Z Z I B I Z Z O HD74HCT243 Data Port Status A O Z Z I B I Z Z O HD74HCT242/HD74HCT243 Pin Arrangement GAB NC 1A 2A 3A 4A GND 1 2 3 4 5 6 7 14 VCC 13 GBA 12 NC 11 1B 10 2B 9 8 3B 4B (Top view) Block Diagram HD74HCT242 VCC A 1 of 4 Transceivers VCC B GBA GAB 2 HD74HCT242/HD74HCT243 HD74HCT243 VCC A 1 of 4 Transceivers VCC B GBA GAB 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....