CY74FCT543T Octal Registered Transceivers with 3-State Outputs |

CY74FCT543T (ACTIVE) Octal Registered Transceivers with 3-State Outputs



The \x92FCT543T octal latched transceivers contain two sets of eight D-type latches with separate latch-enable (LEAB\, LEBA\) and output-enable (OEAB\, OEBA\) inputs for each set to permit independent control of input and output in either direction of data flow. 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 A or to take data from B, 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\ 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 CEBA\, LEBA\, and OEBA\ inputs.

These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.


  • Function, Pinout, and Drive Compatible With FCT and F Logic
  • Reduced VOH (Typically = 3.3 V) Versions of Equivalent FCT Functions
  • Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
  • Ioff Supports Partial-Power-Down Mode Operation
  • Matched Rise and Fall Times
  • Fully Compatible With TTL Input and Output Logic Levels
  • 3-State Outputs
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)
  • Separation Controls for Data Flow in Each Direction
  • Back-to-Back Latches for Storage
  • CY54FCT543T
    • 48-mA Output Sink Current
    • 12-mA Output Source Current
  • CY74FCT543T
    • 64-mA Output Sink Current
    • 32-mA Output Source Current


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Bits (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) Operating temperature range (C) Package Group
CY74FCT543AT Order now FCT     4.75     5.25     8     5     70     0.2     6.5     64     -32     -40 to 85     SOIC | 24
SSOP | 24    
CY74FCT543T Samples not available FCT     4.75     5.25     8     5     70     0.2     8.5     64     -32     -40 to 85     SOIC | 24
SSOP | 24    
CY54FCT543T Samples not available FCT     4.75     5.25     8     5     70     0.2     8.5     64     -32     -55 to 125     CDIP | 24
LCCC | 28