| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | MM74HC643J |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
 National Semiconductor ... | MM74HC643N |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC640 |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC640J |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC640N |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC643 |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC646 |  198Kb/6P | Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC648 |  198Kb/6P | Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC620 |  124Kb/4P | Octal TRI-STATE Transceiver |
| MM74HC623 |  124Kb/4P | Octal TRI-STATE Transceiver |