Octal Registered Transceivers

The SN74BCT543 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 55C to 125C. The SN74BCT543 is characterized for operation from 0C to 70C.
By Texas Instruments