These devices contain two independent 4-input positive-AND gates. They perform the Boolean functions 
or 
in positive logic.
The SN54ALS21A and SN54AS21 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS21A and SN74AS21 are characterized for operation from 0°C to 70°C.
| Technology family | ALS |
| Supply voltage (min) (V) | 4.5 |
| Supply voltage (max) (V) | 5.5 |
| Number of channels | 2 |
| Inputs per channel | 4 |
| IOL (max) (mA) | 8 |
| IOH (max) (mA) | -0.4 |
| Input type | Bipolar |
| Output type | Push-Pull |
| Features | High speed (tpd 10- 50ns) |
| Data rate (max) (Mbps) | 75 |
| Rating | Military |
| Operating temperature range (°C) | -55 to 125 |
| CDIP (J) | 14 | 130.4652 mm² 19.56 x 6.67 |
| LCCC (FK) | 20 | 79.0321 mm² 8.89 x 8.89 |
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