SN74AHC540PW (TEXAS INSTRUMENTS)

The SN74AHC540PW is an octal Buffer/Driver with 3-state outputs. It is ideal for driving bus lines or buffer memory address registers. This device features inputs and outputs on opposite sides of the package to facilitate printed circuit board layout. The 3-state control gate is a two-input AND gate with active-low inputs. If either output-enable input is high, all corresponding outputs are in the high-impedance state. The outputs provide inverted data when they are not in the high-impedance state. Output enable should be tied to VCC through a pull-up resistor to ensure the high-impedance state during power up or power down. The minimum value of the resistor is determined by the current-sinking capability of the driver.