View sn74as38157db datasheet:

( ) SN74AS38157DB 1/2 IL00 ********** 10-BIT 1 OF 2 DATA SELECTORS/MULTIPLEXERS -TOP VIEW- 2 1A VCC1 A/B 1 38 3 4 (+5V) 1B 1Y 5 2A 1A IN 2 37 G IN 6 7 2B 2Y 9 3A 1B IN 3 36 10A IN 10 11 3B 3Y 12 4A 1Y OUT 4 35 10B IN 13 14 4B 4Y 16 5A 2A IN 5 34 10Y OUT 17 18 5B 5Y 22 6A 2B IN 6 33 9A IN 21 20 6B 6Y 26 7A 2Y OUT 7 32 9B IN 25 24 7B 7Y 29 8A 8 GND1 31 9Y OUT 28 27 8B 8Y 33 9A VCC2 3A IN 9 30 32 31 (+5V) 9B 9Y 36 10A 3B IN 10 29 8A IN 35 34 10B 10Y A/B G 3Y OUT 11 28 8B IN 1 37 4A IN 12 27 8Y OUT 4B IN 13 26 7A IN INPUTS OUT G A/B A B Y 4Y OUT 14 25 7B IN 1 X X X 0 0 0 0 X 0 15 GND2 24 7Y OUT 0 0 1 X 1 0 1 X 0 0 VCC3 5A IN 16 23 0 1 X 1 1 (+5V) 0 ; LOW LEVEL 5B IN