View sn74hc191n datasheet:

SN74HC191N IL08D C-MOS PRESETTABLE SYNCHRONOUS 4-BIT BINARY UP/DOWN COUNTER —TOP VIEW— 11 LD B (DATA B) IN 1 VDD 16 15 3 A QA QB OUT 2 15 A (DATA A) IN 1 2 B QB 10 6 C QC QA OUT 3 14 CK (CLOCK) IN 9 7 D QD EN (ENABLE) IN 4 13 CA/BRW2 OUT 14 12 CA/BRW1 (CARRY/BORROW2) 4 13 EN CA/BRW2 /D IN 5 U 12 CA/BRW1 OUT (CARRY/BORROW1) U/D QC OUT 6 11 LD IN 5 (LOAD) QD OUT 7 10 C (DATA C) IN 8 GND 9 D (DATA D) IN MODE SELECTION COUNT SEQUENCE CONTROL INPUTS OUTPUTS MODE COUNT LD EN /D QD QC QB QA U PRESET 0 0 0 0 0 0 X X (ASYNCHRONOUS) 1 0 0 0 1 1 1 X NO COUNT 2 0 0 1 0 1 0 0 UP COUNT 3 0 0 1 1 1 0 1 DOWN COUNT 4 0 1 0 0 5 0 1 0 1 0 ; LOW LEVEL 6 0 1 1 0 1 ; HIGH LEVEL 7 0 1 1 1 X ; DON’T CARE 8 1 0 0 0 CA/BRW OUTPUTS