View hcs200 datasheet:

HCS200 Code Hopping Encoder FEATURES PACKAGE TYPES Security PDIP, SOIC • Programmable 28-bit serial number 8 • Programmable 64-bit encryption key S0 VDD 1 • Each transmission is unique 7 NC 2 • 66-bit transmission code length S1 • 32-bit hopping code 6 PWM 3 S2 • 28-bit serial number, 4-bit function code, VLOW indicator transmitted VSS NC 4 5 • Encryption keys are read protected Operating BLOCK DIAGRAM • 3.5–13.0V operation • Three button inputs Oscillator Power latching - seven functions available and Controller Reset circuit • Selectable baud rate switching • Automatic code word completion • Battery low signal transmitted to receiver • Non-volatile synchronization data EEPROM Other Encoder • Easy to use programming interface • On-chip EEPROM P