| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | MM74C244N |  142Kb/6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
 National Semiconductor ... | MM74C244J |  142Kb/ 6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
 National Semiconductor ... | MM74C240 |  142Kb/ 6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
 National Semiconductor ... | MM74C240J |  142Kb/ 6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
| MM74C240N |  142Kb/ 6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
 National Semiconductor ... | MM74C244 |  142Kb/ 6P | Octal Buffers and Line Drivers with TRI-STATE Outputs |
| MM74C20 |  146Kb/ 6P | Quad 2-Input NAND Gate, Quad 2-Input NOR Gate, Hex Inverter, Triple 3-Input NAND Gate, Dual 4-Input NAND Gate |
 National Semiconductor ... | MM74C221 |  148Kb/ 6P | Dual Monostable Multivibrator |
 National Semiconductor ... | MM74C221C |  148Kb/ 6P | Dual Monostable Multivibrator |
| MM74C221N |  148Kb/ 6P | Dual Monostable Multivibrator |
| MM74C00 |  146Kb/ 6P | Quad 2-Input NAND Gate, Quad 2-Input NOR Gate, Hex Inverter, Triple 3-Input NAND Gate, Dual 4-Input NAND Gate |