General Description
The HT6221/HT6222 are CMOS LSI encoders designed for use in remote control systems. They are capable of encoding 16-bit address codes and 8-bit data codes. Each address/data input can be set to one of the two logic states, 0 and 1.

Features
• Operating voltage: 1.8V~3.5V
• DOUT with 38kHz carrier for IR medium
• Low standby current
• Minimum transmission word: one word
• 455kHz ceramic resonator or crystal
• 16-bit address codes
• 8-bit data codes
• PPM code method
• Three double-active keys
• Maximum active keys  HT6221: 32 keys  HT6222: 64 keys
• Low power and high noise immunity CMOS technology
• HT6221: 20-pin SOP package HT6222: 24-pin SOP package

Applications
• Television and video cassette recorder controllers
• Burglar alarm systems
• Smoke and fire alarm systems
• Garage door controllers
• Car door controllers
• Car alarm systems
• Security systems
• Other remote control systems