The devices 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.

The HT6220A/HT6221A/HT6221B/HT6222A contain 6keys (K21~K23, K25~K27) or 30keys (K1~K20, K33~K34, K37~K38, K41~K42, K45~K46, K49~K50), 32 keys (K1~K32), 48 keys (K1~K32, K33~K34, K37~K38, K41~K42, K45~K46, K49~K50, K53~K54, K57~K58, K61~K62) and 64 keys (K1~K64), respectively. When one of the keys is triggered, the programmed address/data is transmitted together with the header bits via an IR (38kHz carrier) transmission medium.

• Operating voltage: 2.0V~3.6V
• DOUT with 38kHz carrier for IR medium
• Low standby current
• Minimum transmission word: one word
• Build-in RC (Internal RC) oscillator
• 16-bit address codes
• 8-bit data codes
• PPM code method
• Three double-active keys
• Maximum active keys
  -- HT6220A: 6 keys (8SOP) or 30 keys (16NSOP)
  -- HT6221A: 32 keys
  -- HT6221B: 48 keys
  -- HT6222A: 64 keys
• Low power and high noise immunity CMOS technology
• HT6220A: selection of 16-pin NSOP or 8-pin SOP package
  HT6221A/HT6221B: 20-pin SOP package
  HT6222A: 24-pin SOP package
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