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 address/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.

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: 0.1A (typ.) at VDD=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

• Pair with Holteks 212 series of decoders

• 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