CD4049/HCF4049 is a Hex Inverter (NOT gate) IC based in the CMOS technology. That is the IC has six NOT gates inside it and each gate has one input and one output pin. All six NOT gates are power with a common rail, but can operate independently. It is commonly used in buffer circuits and wave generator circuits. The CD4049 IC specification of the IC is given below

• Operating Voltage: 3V to 18v
  
• Current consumption: 50mA (max)
  
• High Sink Current for Driving 2 TTL Loads
• High-to-Low Level Logic Conversion
• Maximum low level output Voltage: 0.5V at 5V Vcc
• Minimum high level output voltage: 4.95 at 5V Vcc

CD4049/HCF4049 IC Applications

• CMOS to DTL or TTL Hex Converters
• CMOS Current Sink or Source Drivers
• CMOS High-to-Low Logic Level Converters