SN74LS33DR и другие
| Компонент | Описание | Производитель | |
| SN74LS33D | QUAD 2-INPUT NOR BUFFER |
Motorola, Inc |
 |
| SN74LS33D | QUADRUPLE 2-INPUT POSITIVE-NOR BUFFERS WITH OPEN-COLLECTOR OUTPUTS |
Texas Instruments |
|
| SN74LS33DR | QUAD 2-INPUT POSITIVE-NOR BUFFERS WITH OPEN COLLECTOR OUTPUTS |
Texas Instruments |
|