74FCT543A

•IDT54/74FCT543 equivalent to FASTÔ speed
•IDT54/74FCT543A 25% faster than FAST
•IDT54/74FCT543C 40% faster than FAST
•Equivalent to FAST output drive over full temperature and voltage supply extremes
•IOL = 64mA (commercial), 48mA (military)
•Separate controls for data flow in each direction
•Back-to-back latches for storage
•CMOS power levels (1mW typ. static)
•Substantially lower input current levels than FAST (5mA max.)
•TTL input and output level compatible
•CMOS output level compatible
•Product available in Radiation Tolerant and Radiation Enhanced versions
•Military product compliant to MIL-STD-883, Class B

The 74FCT543A is a non-inverting octal transceiver built using an advanced dual metal CMOS technology. These devices contain two sets of eight D-type latches with separate input and output controls for each set. For data flow from A to B, for example, the A-to-B Enable (CEAB ) input must be LOW in order to enter data from A0A7 or to take data from B0B7, as indicated in the Function Table. With CEAB  LOW, a LOW signal on the A-to-B Latch Enable (LEAB) input of the 74FCT543A makes the A-to-B latches transparent; a subsequent LOW-to-HIGH transition of theLEAB signal puts the A latches in the storage mode and their outputs no longer change with the A inputs. With CEAB and OEAB both LOW, the 3-state B output buffers are active and reflect the data present at the output of the A latches. Control of data of the 74FCT543A from B to A is similar, but uses the CEBA, LEBA and OEBA  inputs.