HT604L Datasheet, PDF (1/9 Pages) Holtek Semiconductor Inc – 318 Series of Decoders

HT604L/614/692
3¹⁸ Series of Decoders
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 3¹⁸ series of encoders
· 9~10 address pins
· 2~8 data pins
· Trinary address setting
Applications
· Burglar alarm system
· Smoke and fire alarm system
· Garage door controllers
· Car door controllers
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 for-
mat should be selected (refer to the encoder/de-
coder cross reference tables).
The 3¹⁸ series of decoders receive serial address
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 se-
rial input data twice continuously with its local
address. If no errors or unmatched codes are
· Two times of receiving check
· Built-in oscillator needs only a 5% resistor
· Valid transmission indicator
· Easy interface with an RF or an infrared
transmission medium
· Minimal external components
· Package information: refer to Selection
Table
· Car alarm system
· Security system
· Cordless telephones
· Other remote control systems
encountered, the input data codes are decoded
and then transferred to the output pins. The VT
pin also goes high to indicate a valid transmis-
sion.
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 ad-
dress pin whose range is from 8 to 18. In addi-
tion, the 3¹⁸ decoders provide various
combinations of address/data number in differ-
ent packages.
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April 24, 2000