M74HC540B1R
Manufacturers：
ST
Description：
IC INVERTER 8-INPUT 20DIP
M74HC540RM13TR
Manufacturers：
ST
Description：
IC BUS BUFFER OCTAL 3ST 20-SOIC
M74HC541B1R
Manufacturers：
ST
Description：
IC BUFF/DVR TRI-ST 8BIT 20DIP
M74HC541RM13TR
Manufacturers：
ST
Description：
IC BUFF/DVR TRI-ST 8BIT 20SOIC