View sn74act1284ns-e05 datasheet:

SN74ACT1284NS-E05 IL22 ********** C-MOS 7-BIT BUS INTERFACE 3-STATE OUTPUT -TOP VIEW- A1 1 20 B1 A2 2 19 B2 A3 3 18 B3 A4 4 17 B4 5 GND VDD 16 INPUTS OUTPUT MODE DIR HD 6 GND VDD 15 OPEN DRAIN A TO B: BITS 5, 6, 7 0 1 TOTEM POLE B TO A: BITS 1, 2, 3, 4 A5 7 14 B5 B TO A: BITS 1, 2, 3, 4 TOTEM POLE 0 1 AND A TO B: BITS 5, 6, 7 A6 8 13 B6 1 0 OPEN DRAIN A TO B: BITS 1, 2, 3, 4, 5, 6, 7 1 1 TOTEM POLE A TO B: BITS 1, 2, 3, 4, 5, 6, 7 A7 9 12 B7 0 ; LOW LEVEL 1 ; HIGH LEVEL DIR 10 11 HD 11 HD 10 DIR 1-4 A1, A2, A3, A4 20-17 B1, B2, B3, B4 7-9 14-12 A5, A6, A7 B5, B6, B7