| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | DM74LS283 |  158Kb/ 8P | 4-Bit Binary Adders with Fast Carry |
 National Semiconductor ... | DM74LS283M |  158Kb/ 8P | 4-Bit Binary Adders with Fast Carry |
 National Semiconductor ... | DM74LS283N |  158Kb/ 8P | 4-Bit Binary Adders with Fast Carry |
 National Semiconductor ... | DM74LS20M |  124Kb/ 6P | Dual 4-Input NAND Gates |
 National Semiconductor ... | DM74LS20N |  124Kb/ 6P | Dual 4-Input NAND Gates |
 National Semiconductor ... | DM74LS21 |  120Kb/ 6P | Dual 4-Input AND Gates |
| DM74LS22 |  50Kb/ 3P | DUAL 4-INPUT NAND GATE (WITH OPEN-COLLECTOR OUTPUT) |
 National Semiconductor ... | DM74LS221 |  142Kb/ 6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |