NXP 74HC540D 缓冲器/线路驱动器, 反相, 3态, 8门, 1输入, 2V至6V, SOIC-20
The is a 8-bit inverting Buffer/Line Driver with 3-state outputs. The device features two output enables OE1 and OE2. A HIGH on OEn causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.