HT12D/HT12F
2
12
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 Holtek¢s 2
12
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 2
12
decoders are a series of CMOS LSIs for remote
control system applications. They are paired with
Holtek¢s 2
12
series of encoders (refer to the encoder/de-
coder cross reference table). For proper operation, a
pair of encoder/decoder with the same number of ad-
dresses and data format should be chosen.
The decoders receive serial addresses and data from a
programmed 2
12
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 continu-
ously with their local addresses. If no error or un-
matched 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 2
12
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 pro-
vide 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
¾
VT
Ö
Ö
Oscillator
RC oscillator
RC oscillator
Trigger
DIN active
²Hi²
DIN active
²Hi²
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
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
