DM74LS221 Dual Non-Retriggerable One-Shot with Clear Complementary Outputs
DM74LS221CW Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs
DM74LS221J/A+ Monostable Multivibrator
DM74LS221M Dual Non-Retriggerable One-Shot with Clear Complementary Outputs
DM74LS221MX Monostable Multivibrator
DM74LS221N Dual Non-Retriggerable One-Shot with Clear Complementary Outputs
DM74LS221N/A+ Monostable Multivibrator
DM74LS221N/B+ Monostable Multivibrator
DM74LS221SJ Dual Non-Retriggerable One-Shot with Clear Complementary Outputs
DM74LS221SJX Monostable Multivibrator