View sn74hc259n datasheet:

SN74HC259N IL00 *********** C-MOS 8-BIT ADDRESSABLE LATCHES —TOP VIEW— RD EN DI Q7 Q6 Q5 Q4 IN IN IN OUT OUT OUT OUT 16 15 14 13 12 11 10 9 1 2 3 A B C VDD 4 Q0 5 Q1 6 Q2 7 Q3 13 D1 9 Q4 GND 10 Q5 1 2 3 4 5 6 7 8 11 Q6 A B C Q0 Q1 Q2 Q3 12 Q7 IN IN IN OUT OUT OUT OUT EN RD 14 15 MODE SELECTION LATCH SELECTION CONTROL OUTPUT OUTPUT CONTROL LATCH INPUTS OF ADDRESSED OF EACH OTHER INPUTS ADDRESSED RD EN LATCH LATCH C B A 1 0 D1 Qno 0 0 0 0 1 1 Qno Qno 0 0 1 1 0 0 D1 0 0 1 0 2 0 1 0 0 0 1 1 3 1 0 0 4 1 0 1 5 0 ; LOW LEVEL 1 1 0 6 1 ; HIGH LEVEL 1 1 1 7 NOTE: TYPE VDD TC40H +2V to +8V OTHERS +2V to +6V