HT12A Datasheet, PDF (1/13 Pages) Holtek Semiconductor Inc – Series of Encoders

HT12A/HT12E
2¹² Series of Encoders
Features
· Operating voltage
- _{2.4V~5V for the HT12A}
- _{2.4V~12V for the HT12E}
· Low power and high noise immunity CMOS
technology
· Low standby current: 0.1mA (typ.) at
V_DD=5V
· HT12A with a 38kHz carrier for infrared
transmission medium
· Minimum transmission word
- _{Four words for the HT12E}
- _{One word for the HT12A}
· Built-in oscillator needs only 5% resistor
· Data code has positive polarity
· Minimal external components
· HT12A/E: 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 encoders are a series of CMOS LSIs for
remote control system applications. They are
capable of encoding information which consists
of N address bits and 12-N data bits. Each ad-
dress/data input can be set to one of the two
logic states. The programmed addresses/data
are transmitted together with the header bits
via an RF or an infrared transmission medium
upon receipt of a trigger signal. The capability
to select a TE trigger on the HT12E or a DATA
trigger on the HT12A further enhances the ap-
plication flexibility of the 2¹² series of encoders.
The HT12A additionally provides a 38kHz car-
rier for infrared systems.
Selection Table
Function _{Address Address/}
Part No.
No. Data No.
Data
No.
Oscillator
Trigger
HT12A
8
0
4
455kHz
resonator
D8~D11
HT12E
8
4
0
RC
oscillator
TE
Package
18 DIP
20 SOP
18 DIP
20 SOP
Carrier Negative
Output Polarity
38kHz
No
No
No
Note: Address/Data represents pins that can be address or data according to the decoder require-
ment.
1
April 11, 2000