Nxp 74hc series logic devices nxp 74hc244d 652 the 74hct244d is an 8 bit bufferline driver with 3 state outputs the device can be used as two 4 bit buffers or one 8 bit buffer the device features two output enables 1oe and 2oe each controlling four of the 3 state outputs a high on noe causes the outputs to assume a high impedance off state inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of vcc nxp 74hc244d 652 sm