SN74BCT543 Octal Registered Transceivers |

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Octal Registered Transceivers



The 'BCT543 octal transceiver contains two sets of D-type latches for temporary storage of data flowing in either direction. Separate latch-enable (LEAB\ or LEBA\) and output-enable (OEAB\ or OEBA\) inputs are provided for each register to permit independent control in either direction of data flow.

The A-to-B enable (CEAB\) input must be low in order to enter data from A or to output data from B. If CEAB\ is low and LEAB\ is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB\ puts the A latches in the storage mode. With CEAB\ and OEAB\ both low, the 3-state B outputs are active and reflect the data present at the output of the A latches. Data flow from B to A is similar but requires using the CEBA\, LEBA\, and OEBA\ inputs.

The SN54BCT543 is characterized for operation over the full military temperature range of \x9655°C to 125°C. The SN74BCT543 is characterized for operation from 0°C to 70°C.


  • State-of-the-Art BiCMOS Design Significantly Reduces ICCZ
  • 3-State True Outputs
  • Back-to-Back Registers for Storage
  • ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015
  • Package Options Include Plastic Small-Outline Packages (DW), Ceramic Chip Carriers (FK) and Flatpacks (W), and Plastic and Ceramic 300-mil DIPs (JT, NT)


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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
SN74BCT543 Order now BCT     4.5     5.5     8     5     70     0.071     9.6     64     -15     0 to 70     SOIC | 24    
SN54BCT543 Samples not available BCT     4.5     5.5     8     5     70     0.071     9.6     64     -15     -55 to 125     CDIP | 24
LCCC | 28