MC74LCX16501

The MC74LCX16501 is a high performance, noninverting 18bit universal bus transceiver operating from a 2.7 to 3.6V supply. This part is not byte controlled; it is "18bit" controlled. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A VI specification of 5.5V allows MC74LCX16501 inputs to be safely driven from 5V devices. The MC74LCX16501 is suitable for memory address driving and all TTL level bus oriented transceiver applications.

Data of MC74LCX16501 flow in each direction is controlled by Output Enable (OEAB, OEBA), Latch Enable (LEAB, LEBA) and Clock inputs (CAB, CBA). When LEAB is HIGH, the AtoB dataflow is transparent. When LEAB is LOW, and CAB is held at LOW or HIGH, the data A is latched; on the LOWtoHIGH transition of CAB the Adata is stored in the latch/flipflop. The outputs are active when OEAB is HIGH. When OEAB is LOW the Boutputs are in 3state. Similarly, the LEBA, OEBA and CBA control the BtoA dataflow. Please note that the output of MC74LCX16501 enables are complementary; OEAB is active HIGH, OEBA is active LOW.