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HT682L Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT682L Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 14 page  3 18 Series of Decoders Selection Table Function Address No. Data VT Oscillator Trigger Package Item No. Type HT602L 12 2 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP HT604L 10 4 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP HT605L 9 5 L √ RC oscillator DIN active “Hi” 20 DIP/20 SOP HT611 14 0 — √ RC oscillator DIN active “Hi” 20 DIP/20 SOP Features • Operating voltage: 2.4V~12V • Low power and high noise immunity CMOS technology • Low standby current • Capable of decoding 18 bits of information • Pairs with HOLTEK’s 3 18 series of encoders • 8~18 address pins • 0~8 data pins • Trinary address setting • Two times of receiving check • Built-in oscillator needs only a 5% resistor • Valid transmission indictor • Easily interface with an RF or an infrared transmission medium • Minimal external components General Description The 3 18 decoders are a series of CMOS LSIs for remote control system applications. They are paired with the 3 18 series of encoders. For proper operation a pair of encoder/decoder pair with the same number of address and data format should be selected (refer to the en- coder/decoder cross reference tables). The 3 18 series of decoders receives serial ad- dress and data from that series of encoders that are transmitted by a carrier using an RF or an IR transmission medium. It then compares the serial input data twice continuously with its local address. If no errors or unmatched codes are encountered, the input data codes are de- coded and then transferred to the output pins. The VT pin also goes high to indicate a valid transmission. The 3 18 decoders are capable of decoding 18 bits of information that consists of N bits of address and 18–N bits of data. To meet various applica- tions they are arranged to provide a number of data pins whose range is from 0 to 8 and an address pin whose range is from 8 to 18. In addition, the 3 18 decoders provide various com- binations of address/data number in different packages. Applications • Burglar alarm system • Smoke and fire alarm system • Garage door controllers • Car door controllers • Car alarm system • Security system • Cordless telephones • Other remote control systems 1 2nd Oct ’97 |
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