View hcs361 datasheet:

M HCS361 Code Hopping Encoder FEATURES PACKAGE TYPES Security PDIP, SOIC • Programmable 28/32-bit serial number 8 S0 VDD 1 • Programmable 64-bit encryption key • Each transmission is unique 7 LED 2 S1 • 67-bit transmission code length • 32-bit hopping code 6 PWM 3 S2 • 35-bit fixed code (28/32-bit serial number, VSS 4/0-bit function code, 1-bit status, 2-bit CRC) S3 4 5 • Encryption keys are read protected Operating HCS361 BLOCK DIAGRAM • 2.0-6.6V operation • Four button inputs Oscillator Power - 15 functions available latching and Controller • Selectable baud rate Reset circuit switching • Automatic code word completio.n LED LED driver • Battery low signal transmitted to receiver • Nonvolatile synchronization data • PWM and VPWM modulation EE