基本介紹
- 中文名:74LS148
- 本質:8 線-3 線優先編碼器
- 領域:電子電路
- 0-7管腳:編碼輸入端(低電平有效)
- EI:選通輸入端(低電平有效)
- EO:選通輸出端,即使能輸出端
晶片管腳
功能表
輸入 | 輸出 | ||||||||||||
EI | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | A2 | A1 | A0 | GS | EO |
1 | X | X | X | X | X | X | X | X | 1 | 1 | 1 | 1 | 1 |
0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
0 | X | X | X | X | X | X | X | 0 | 0 | 0 | 0 | 0 | 1 |
0 | X | X | X | X | X | X | 0 | 1 | 0 | 0 | 1 | 0 | 1 |
0 | X | X | X | X | X | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 |
0 | X | X | X | X | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
0 | X | X | X | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
0 | X | X | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 |
0 | X | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 |