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HT12D/HT12F 212 Series of Decoders Features · Operating voltage: 2.4V~12V · Low power and high noise immunity CMOS · Built-in oscillator needs only 5% resistor · Valid transmission indicator · Easy interface with an RF or an infrared transmission technology · Low standby current · Capable of decoding 12 bits of information · Binary address setting · Received codes are checked 3 times · Address/Data number combination - HT12D: 8 address bits and 4 data bits - HT12F: 12 address bits only medium · Minimal external components · Pair with Holtekўs 212 series of encoders · 18-pin DIP, 20-pin SOP package 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 General Description The 212 decoders are a series of CMOS LSIs for remote control system applications. They are paired with Holtekўs 212 series of encoders (refer to the encoder/decoder cross reference table). For proper operation, a pair of encoder/decoder with the same number of addresses and data format should be chosen. The decoders receive serial addresses and data from a programmed 212 series of encoders that are transmitted by a carrier using an RF or an IR transmission medium. They compare the serial input data three times continuously with their local addresses. If no error or unmatched codes are found, the input data codes are decoded and then transferred to the output pins. The VT pin also goes high to indicate a valid transmission. The 212 series of decoders are capable of decoding informations that consist of N bits of address and 12-N bits of data. Of this series, the HT12D is arranged to provide 8 address bits and 4 data bits, and HT12F is used to decode 12 bits of address information. Selection Table Function Part No. HT12D HT12F Address No. 8 12 Data No. 4 0 Type L ѕ VT Ц Ц Oscillator RC oscillator RC oscillator Trigger DIN active ІHiІ DIN active ІHiІ Package 18DIP, 20SOP 18DIP, 20SOP Notes: Data type: L stands for latch type data output. VT can be used as a momentary data output. Rev. 1.10 1 November 18, 2002 HT12D/HT12F Block Diagram O S C 2 O S C 1 O s c illa to r D iv id e r D a ta S h ift R e g is te r L a tc h C ir c u it D a ta D IN B u ffe r D a ta D e te c to r S y n c . D e te c to r C o m p a ra to r C o m p a ra to r C o n tr o l L o g ic T r a n s m is s io n G a te C ir c u it B u ffe r V T A d d re s s V D D V S S Note: The address/data pins are available in various combinations (see the address/data table). Pin Assignment 8 -A d d re s s 4 -D a ta A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 V S S 9 8 7 6 5 4 3 2 1 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 V D D V T O S C 1 O S C 2 D IN D 1 1 D 1 0 D 9 D 8 8 -A d d re s s 4 -D a ta N C 1 2 3 4 5 6 7 8 9 1 0 A 0 A 1 A 2 A 3 A 4 A 5 A 6 A 7 V S S 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 N C V D D V T O S C 1 O S C 2 D IN D 1 1 D 1 0 D 9 D 8 1 2 -A d d re s s 0