晶片管腳
管腳圖0－7 編碼輸入端(低電平有效)
EI 選通輸入端(低電平有效)
A0、A1、A2 三位二進制編碼輸出信號即編碼 輸 出 端(低電平有效)
GS 片優先編碼輸出端即寬展端(低電平有效)
EO 選通輸出端，即使能輸出端
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 |
實物圖1－高電平0－低電平 X－任意
邏輯及工作極限
邏輯圖電源電壓：min 4.75V type 5.0V max 5.25V
輸入電壓：min 2V
發射極間電壓：±5.5V
工作環境溫度 ：0～70℃
貯存溫度：－65～150℃
