HD74HC540

HD74HC540/HD74HC541 Octal Buffers/Line Drivers (with 3-state outputs) Description The HD74HC540 is an inverting buffer and the HD74HC541 is a non-inverting buffer. The 3-state control gate operates as a two-input NOR such that if either G 1 or G 2 are high, all eight outputs are in the highimpedance state. Features High Speed Operation: tpd = 11.5 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 Inputs G1 L L H X X : Z : G2 L L X H A L H X X Output Y HD74HC540 H L Z Z HD74HD541 L H Z Z irrelevant off (high-impedance) state of a 3-state output. HD74HC540/HD74HC541 Pin Arrangement HD74HC540 G1 A1 A2 A3 A4 A5 A6 A7 A8 1 20 VCC 19 G2 18 Y1 17 Y2 16 Y3 15 Y4 14 Y5 2 3 4 5 6 7 8 9 13 Y6 12 Y7 11 Y8 GND 10 (Top view) 2 HD74HC540/HD74HC541 HD74HC541 G1 A1 A2 A3 A4 A5 A6 A7 A8 1 20 VCC 19 G2 18 Y1 17 Y2 16 Y3 15 Y4 14 Y5 2 3 4 5 6 7 8 9 13 Y6 12 Y7 11 Y8 GND 10 (Top view) Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage Output current DC current drai 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 –65 to +150 Unit V V V mA mA mA mA mW °C 3 HD74HC540/HD74HC541 DC Charact...