The CD4020 is a 14-stage ripple carry binary counter. The IC is a part of the CD4XXX IC series. CD4020 counters advance one count on the negative transition of each clock pulse. The counters are reset to the zero states by a logical “1” at the reset input independent of the clock. 

Technical Specification:

• Part number: CD4020
• Technology Family: CD4000
• VCC: 3V to 18V
• Bits (#): 12
• Voltage (Nom): 5, 10, 15V
• F @ nom voltage (Max) (MHz): 8MHz
• ICC @ nom voltage (Max) (mA): 0.03mA
• Tpd @ nom Voltage (Max):160ns
• IOL (Max): 1.5mA
• IOH (Max): -1.5mA
• Operating temperature range (C): -55°C to 125°C

Features:

• 5-stage Divide-by-10 Johnson Counter with 10 Decoded Output and a Carry Bit
• Medium Speed up to 5MHz
• Wide Operating Voltage Range
• Low Power CMOS

 Applications:

• Control counters
• Timers
• Time-delay circuits
• Frequency dividers