These devices contain four independent 2-input-NOR line drivers. They perform the Boolean function Y = A + B or Y = A · B. The SN54128 is designed to drive 75 ohm lines. The SN74128 is designed to drive 50 ohm lines.
The SN54128 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74128 is characterized for operation from 0°C to 70°C.
| Technology family | TTL |
| Number of channels | 4 |
| Supply voltage (min) (V) | 4.75 |
| Supply voltage (max) (V) | 5.25 |
| Inputs per channel | 2 |
| IOL (max) (mA) | 48 |
| IOH (max) (mA) | -42.4 |
| Output type | Push-Pull |
| Input type | Bipolar |
| Features | High speed (tpd 10- 50ns) |
| Data rate (max) (Mbps) | 70 |
| Rating | Catalog |
| Operating temperature range (°C) | 0 to 70 |
| PDIP (N) | 14 | 181.42 mm² 19.3 x 9.4 |
| SOIC (D) | 14 | 51.9 mm² 8.65 x 6 |
| SOP (NS) | 14 | 79.56 mm² 10.2 x 7.8 |
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