SDLS144D April 1985 – October 2016 SN54LS240 , SN54LS241 , SN54LS244 , SN54S240 , SN54S241 , SN54S244 , SN74LS240 , SN74LS241 , SN74LS244 , SN74S240 , SN74S241 , SN74S244
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NO. | NAME | ||
| 1 | 1G | I | Channel 1 output enable |
| 2 | 1A1 | I | Channel 1, A side 1 |
| 3 | 2Y4 | O | Channel 2, Y side 4 |
| 4 | 1A2 | I | Channel 1, A side 2 |
| 5 | 2Y3 | O | Channel 2, Y side 3 |
| 6 | 1A3 | I | Channel 1, A side 3 |
| 7 | 2Y2 | O | Channel 2, Y side 2 |
| 8 | 1A4 | I | Channel 1, A side 4 |
| 9 | 2Y1 | O | Channel 2, Y side 1 |
| 10 | GND | — | Ground |
| 11 | 2A1 | I | Channel 2, A side 1 |
| 12 | 1Y4 | O | Channel 1, Y side 4 |
| 13 | 2A2 | I | Channel 2, A side 2 |
| 14 | 1Y3 | O | Channel 1, Y side 3 |
| 15 | 2A3 | I | Channel 2, A side 3 |
| 16 | 1Y2 | O | Channel 1, Y side 2 |
| 17 | 2A4 | I | Channel 2, A side 4 |
| 18 | 1Y1 | O | Channel 1, Y side 1 |
| 19 | 2G/2G(1) | I | Channel 2 output enable |
| 20 | VCC | — | Power supply |