DESCRIPTION:
The FCT543T/FCT2543T is a non-inverting octal transceiver built using an advanced dual metal CMOS technology.
This device contains 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 A0–A7 or to take data from B0–B7, as indicated in the Function Table. With CEAB LOW, a LOW signal on the A-to-B Latch Enable (LEAB) input makes the A-to-B latches transparent; a subsequent LOW-to-HIGH transition of the LEAB 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 from B to A is similar, but uses the CEBA, LEBA and OEBA inputs.
The FCT2543T has balanced output drive with current limiting resistors. This offers low ground bounce, minimal undershoot and controlled output fall times-reducing the need for external series terminating resistors. FCT2xxxT parts are plug-in replacements for FCTxxxT parts.

FEATURES:
• Common features:
   – Low input and output leakage ≤1µA (max.)
   – CMOS power levels
   – True TTL input and output compatibility
   – VOH = 3.3V (typ.)
   – VOL = 0.3V (typ.)
   – Meets or exceeds JEDEC standard 18 specifications
   – Product available in Radiation Tolerant and Radiation
      Enhanced versions
   – Military product compliant to MIL-STD-883, Class B
      and DESC listed (dual marked)
   – Available in DIP, SOIC, SSOP, QSOP, CERPACK
      and LCC packages
• Features for FCT543T:
   – Std., A, C and D speed grades
   – High drive outputs (-15mA IOH, 64mA IOL)
   – Power off disable outputs permit “live insertion”
• Features for FCT2543T:
   – Std., A, and C speed grades
   – Resistor outputs (-15mA IOH, 12mA IOL Com.)
      (-12mA IOH, 12mA IOL Mil.)
   – Reduced system switching noise