View tc74hc668p datasheet:

TC74HC668P IL08 C-MOS PRESETTABLE SYNCHRONOUS 4-BIT DECADE UP/DOWN COUNTER —TOP VIEW— 9 VCC LD U/ (UP/ ) IN 1 16 D DOWN 3 14 (+12 to +6 V) 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 15 CO B (DATA B) IN 4 13 QB OUT 7 EN1 10 EN2 C (DATA C) IN 5 12 QC OUT U/ D 1 D (DATA D) IN 6 11 QD OUT EN1 (ENABLE 1) IN 7 10 EN2 (ENABLE 2) IN 8 GND 9 LD (LOAD) IN MODE SELECTION COUNT SEQUENCE INPUTS OUTPUTS MODE COUNT LD EN1 EN2 U/ QD QC QB QA D 0 x x x PRESET 0 0 0 0 0 x 1 x x NO COUNT 1 0 0 0 1 x x 1 x NO COUNT 2 0 0 1 0 1 0 0 1 UP COUNT 3 0 0 1 1 1 0 0 0 DOWN COUNT 4 0 1 0 0 5 0 1 0 1 0 : LOW LEVEL 6 0 1 1 0 1 : HIGH LEVEL 1 7 0 1 1 x : DON’T CARE 0 8 1 0 0 1 9 1