View idt74fct543ats0 datasheet:

IDT74FCT543ATSO (1/2) IL08 ********** C-MOS MSI OCTAL LATCHED TRANSCEIVER - TOP VIEW - 11 22 CEAB B0 LEBA IN 1 V DD(+5V) 24 23 21 CEBA B1 20 B2 OEBA IN 2 23 CEBA IN 14 19 LEAB B3 1 18 LEBA B4 A0 IN 3 22 B0 OUT 17 B5 13 16 OEAB B6 A1 IN 4 21 B1 OUT 2 15 OEBA B7 A2 IN 5 20 B2 OUT 3 A0 4 A1 A3 IN 6 19 B3 OUT 5 A2 6 A3 A4 IN 7 18 B4 OUT 7 A4 8 A5 A5 IN 8 17 B5 OUT 9 A6 10 A7 A6 IN 9 16 B6 OUT A7 IN 10 15 B7 OUT CEAB IN 11 14 LEAB IN 12 GND 13 OEAB IN A0-A7 ; A TO B DATA INPUTS OR B TO A 8 STATE OUTPUTS B0-B7 ; B TO A DATA INPUTS OR B TO A 8 STATE OUTPUTS CEAB ; A TO B ENABLE INPUT CEBA ; B TO A ENABLE INPUT LEAB ; A TO B LATCH INPUT LEBA ; B TO A LATCH INPUT OEAB ; A TO B OUTPUT ENABLE INPUT OEBA ; B TO A OUTPUT ENABLE INPUT LATCH OUTPUTS INPUT