National Semiconductor DM74LS221 - Dual Non-Retriggerable One-Shot DM74LS221 Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs February 1992 DM74LS221 Dual Non-Retriggerable One-Shot with Clear an Rating: 1 ★ (3 votes)
Fairchild Semiconductor DM74LS221 - Dual Non-Retriggerable One-Shot DM74LS221 Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs August 1986 Revised April 2000 DM74LS221 Dual Non-Retriggerable One-S Rating: 1 ★ (3 votes)