HT12D_09 Datasheet, PDF (1/12 Pages) Holtek Semiconductor Inc – Low power and high noise immunity CMOS

HT12D/HT12F
2¹² Series of Decoders
Features
· Operating voltage: 2.4V~12V
· Low power and high noise immunity CMOS
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
· Built-in oscillator needs only 5% resistor
· Valid transmission indicator
· Easy interface with an RF or an infrared transmission
medium
· Minimal external components
· Pair with Holtek¢s 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
Holtek¢s 2¹² 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 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 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 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 pro-
vide 8 address bits and 4 data bits, and HT12F is used to
decode 12 bits of address information.
Selection Table
Function _Address
Part No.
No.
Data
No. Type
VT
HT12D
8
4
L
Ö
HT12F
12
0
¾
Ö
Notes: Data type: L stands for latch type data output.
VT can be used as a momentary data output.
Oscillator
Trigger
Package
RC oscillator
RC oscillator
DIN active ²Hi² 18DIP, 20SOP
DIN active ²Hi² 18DIP, 20SOP
Rev. 1.20
1
February 20, 2009