View tc74hc161p datasheet:

TC74HC161P IL00 C-MOS SYNCHRONOUS PRESETTABLE 4-BIT BINARY COUNTER —TOP VIEW— 9 (RESET) IN 1 VDD 16 RD LD 3 14 A QA 4 13 B QB CK (CLOCK) IN 2 15 CO (CARRY OUT) 5 12 C QC 6 11 D QD A (DATA A) IN 3 14 QA OUT 2 B (DATA B) IN 4 13 QB OUT 7 15 EN1 CO 10 EN2 C (DATA C) IN 5 12 QC OUT RD 1 D (DATA D) IN 6 11 QD OUT EN 1 (ENABLE 1) IN 7 10 EN2 (ENABLE 2) IN 8 GND 9 (LOAD) IN LD MODE SELECTION COUNT SEQUENCE OUTPUTS CONTROL INPUTS MODE COUNT RD LD EN1 EN2 QD QC QB QA 0 0 0 0 0 RESET 0 x x x (ASYNCHRONOUS) 1 0 0 0 1 2 0 0 1 0 PRESET 1 0 x x (SYNCHRONOUS) 3 0 0 1 1 1 1 0 x NO COUNT 4 0 1 0 0 1 1 x 0 NO COUNT 5 0 1 0 1 1 1 1 1 COUNT 6 0 1 1 0 7 0 1 1 1 0 : LOW LEVEL 8 1 0 0 0 1 : HIGH LEVEL 9 1 0 0 1 x : DON’T CARE 10 1 0 1 0 11 1 0 1 1 CA