18
3 Series of Decoders
Features
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Operating voltage: 2.4V~12V
Low power and high noise immunity CMOS
technology
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
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Low standby current
Capable of decoding 18 bits of information
Pairs with HOLTEK’s 318 series of encoders
8~18 address pins
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Minimal external components
0~8 data pins
Applications
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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 318 decoders are a series of CMOS LSIs for
remote control system applications. They are
paired with the 318 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 318 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 318 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 318 decoders provide various com-
binations of address/data number in different
packages.
Selection Table
F u n ct ion
Da ta
Ad d r ess
No.
VT Oscilla tor
Tr igger
P a ck a ge
Item
HT602L
No. Typ e
12
10
9
2
4
5
0
L
L
√
√
√
√
RC oscillator DIN active “Hi” 20 DIP/20 SOP
RC oscillator DIN active “Hi” 20 DIP/20 SOP
RC oscillator DIN active “Hi” 20 DIP/20 SOP
RC oscillator DIN active “Hi” 20 DIP/20 SOP
HT604L
HT605L
HT611
L
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2nd Oct ’97