| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | MM74HC643 |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC643J |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC643N |  145Kb/6P | Inverting Octal TRI-STATE Transceiver |
 National Semiconductor ... | MM74HC640 |  145Kb/ 6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC640J |  145Kb/ 6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC640N |  145Kb/ 6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC643J |  145Kb/ 6P | Inverting Octal TRI-STATE Transceiver |
| MM74HC643N |  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 |