SN74LS221N
Manufacturers：
Texas Instruments
Description：
IC DUAL MONO MULTIVIB 16-DIP
SN74LS221NE4
Manufacturers：
Texas Instruments
Description：
IC DUAL MONO MULTIVIB 16-DIP
SN74LS221NSR
Manufacturers：
Texas Instruments
Description：
IC DUAL MONO MULTIVIBRATR 16SO