View sn74247n datasheet:

SN74247N ********** IL00 TTL BCD-TO-SEVEN-SEGMENT DECODER/DRIVER (OPEN COLLECTOR OUTPUT) —TOP VIEW— B 1 VCC 16 7 13 A a 1 12 C 2 f 15 B b a 2 11 C c f 6 10 b g LT 3 g 14 D d 3 9 e c LT e 15 d BI/RBO 4 a 13 f 14 g 5 RBI 5 b 12 RBI BI/RBO 4 D 6 c 11 A 7 d 10 LT ; LAMP TEST BI/RBO ; BLANKING IN/ 8 e RIPPLE BLANKING OUT 9 GND RBI ; RIPPLE BLANKING IN INPUTS OUTPUTS DISPLAY BI/RBO DECIMAL (HEXADECIMAL) LT RBI D C B A a b c d e f g 1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 X 0 0 0 1 1 1 0 0 1 1 1 1 1 1 X 0 0 1 0 1 0 0 1 0 0 1 0 2 1 X 0 0 1 1 1 0 0 0 0 1 1 0 3 1 X 0 1 0 0 1 1 0 0 1 1 0 0 4 1 X 0 1 0 1 1 0 1 0 0 1 0 0 5 1 X 0 1 1 0 1 0 1 0 0 0 0 0 6 1 X 0 1 1 1 1 0 0 0 1 1 1 1 7 1 X 1 0 0 0 1 0 0 0 0 0 0 0