3
Features
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12
Series of Decoders
Received data are checked two times
Built-in oscillator needs only 5% resistor
VT goes high during a valid transmission
Easy interface with an RF or an infrared
transmission medium
Minimal external components
Package information: refer to Selection
Table
Operating voltage: 2.4V~12V
Low power and high noise immunity CMOS
technology
Low standby current
Capable of decoding 12 bits of information
Pair with Holtek¢s 3
12
series of encoders
8~12 address pins
0~4 data pins
Trinary address setting
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Applications
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Burglar alarm system
Smoke and fire alarm system
Garage door controllers
Car door controllers
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Car alarm system
Security system
Cordless telephones
Other remote control systems
General Description
The 3
12
decoders are a series of CMOS LSIs for
remote control system applications. They are
paired with 3
12
series of encoders. For proper
operation a pair of encoder/decoder with the
same number of address and data format
should be selected (refer to the encoder/decoder
cross reference tables).
The 3
12
series of decoders receive serial address
and data from its corredponding series of
encoders that are transmitted by a carrier us-
ing an RF or an IR transmission medium. Then
it compares the serial input information twice
continuously with its local address. If no errors
or unmatched codes are encountered, the input
data codes are decoded and transferred to the
output pins. The VT pin also goes high to indi-
cate a valid transmission.
The 3
12
series of decoders are capable of decod-
ing 12 bits of information that consists of N bits
of address and 12-N bits of data. To meet vari-
ous applications they are arranged to provide a
number of data pins ranging from 0 to 4 and an
address pin ranging from 8 to 12. Thus, various
combinations of address/data number are
available in different packages.
1
December 13, 1999
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
