View sn74abt16823dggr datasheet:

SN74ABT16823DGGR (1/2) IL08 C-MOS 18-BIT BUS-INTERFACE FLIP-FLOPS WTIH 3-STATE OUTPUTS —TOP VIEW— INPUTS OUTPUT 1 IN 1 56 1CLK IN CLK D Q CLR OE CLKCLKEN 0 0 x x x 0 1 IN 2 55 1 IN OE CLKEN 0 1 0 1 1 1Q1 OUT 3 54 1D1 IN 0 1 0 0 0 0 1 0 0 x Q0 4 GND GND 53 0 1 1 x x Q0 1Q2 OUT 5 52 1D2 IN 1 x x x x HI-Z 1Q3 OUT 6 51 1D3 IN 0 : LOW LEVEL 1 : HIGH LEVEL 7 VDD VDD 50 x : DON’T CARE 1Q4 OUT 8 49 1D4 IN HI-Z : HIGH IMPEDANCE 1Q5 OUT 9 48 1D5 IN 1Q6 OUT 10 47 1D6 IN INPUT 1D1 - 1D9, 2D1 - 2D9 : DATA 11 GND GND 46 1 , 2 : OUTPUT ENABLE OE OE 1Q7 OUT 12 45 1D7 IN 1 , 2 : CLOCK ENABLE CLKEN CLKEN 1 , 2 : CLEAR 1Q8 OUT 13 44 1D8 IN CLR CLR 1Q9 OUT 14 43 1D9 IN OUTPUT 2Q1 OUT 15 42 2D1 IN 1Q1 - 1Q9, 2Q1 - 2Q9 : DATA 2Q2 OUT 16 4