74LS20
Dual 4-Input NAND Gate (Fairchild Semiconductor)
74LS20
Dual 4-input Positive NAND Gates (Hitachi Semiconductor)
74LS20
Dual 4-Input NAND Gates (National Semiconductor)
74LS20
DUAL 4-INPUT NAND GATE (Motorola)
74LS21
DUAL 4-INPUT AND GATE (Motorola)
74LS21
Dual 4-input Positive AND Gates (Hitachi Semiconductor)
74LS22
DUAL 4-INPUT NAND GATE (Motorola)
74LS221
Dual Monostable Multivibrators (ON Semiconductor)
74LS221
Dual Non-Retriggerable One-Shot (Fairchild Semiconductor)
74LS240
LOW POWER SCHOTTKY (ON Semiconductor)