The MDT75C277 is an OTP Encoder using CMOS technology. It has a maximum of 20 bits addressing code providing up to one million codes. It can reduce any code collision and unauthorized code scanning possibilities.  2. Features  CMOS technology.  Wide range of Operating Voltage : Vdd = 3.0V ~ 12V.  Up to 4 data pins.  Total 1048576 address codes.  Built-in RC oscillator with single external resistor.  Available in DIP and SOP package.  Automatically enter sleep mode if press button over 3 ~ 5 sec