| nhà sản xuất | tên linh kiện | bảng dữ liệu | Giải thích chi tiết về linh kiện |
 National Semiconductor ... | 74F257ASC |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F257ASCSCX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 74F257ASCSJX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F257ASCSCX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 74F257ASCSJX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F257ASJ |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F257ASJSCX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 74F257ASJSJX |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F257APC |  157Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |