MC74LCX16543A

The MC74LCX16543A is a high performance, noninverting 16bit latching transceiver operating from a 2.7 to 3.6V supply. The device is byte controlled. Each byte has separate control inputs which can be tied together for full 16bit operation. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A V_I specification of 5.5V allows MC74LCX16543A inputs to be safely driven from 5V devices. The MC74LCX16543A is suitable for memory address driving and all TTL level bus oriented transceiver applications.

For data of MC74LCX16543A flow from A to B with the EAB LOW, the AtoB Output Enable (OEAB) must be LOW in order to enable data to the B bus, as indicated in the Function Table. With EAB LOW, a LOW signal on the AtoB Latch Enable (LEAB) input makes the AtoB latches transparent; a subsequent LOWtoHIGH transition of the LEAB signal will latch the A latches, and the outputs no longer change with the A inputs. With EAB and OEAB both LOW, the 3State B output buffers are active and reflect the data present at the output of the A latches. Control of data flow of MC74LCX16543A from B to A is symmetric to that above, but uses the EBA, LEBA, and OEBA inputs.