The 54283 is a 4-bit binary full adder with internal carry lookahead manufactured by National Semiconductor Corporation. It accepts two 4-bit binary numbers (A0-A3 B0-B3) and a carry input (C0), and generates binary sum outputs (S0-S3) and carry output (C4) from the most significant bit. It also works with active high or active low operands (positive or negative logic)
This document is a datasheet for the National Semiconductor 54283/DM74283, a high-speed 4-bit binary full adder with internal carry lookahead. The device accepts two 4-bit binary words and a carry input to generate sum outputs and a carry output, operating with either active HIGH or active LOW operands.
| Supply Voltage (Min) | 4.5 V |
|---|---|
| Supply Voltage (Nom) | 5 V |
| Supply Voltage (Max) | 5.5 V |
| Operating Temperature Range (Military) | -55°C to +125°C |
| Operating Temperature Range (Commercial) | 0°C to +70°C |
| Propagation Delay (A to S) | 24 ns |
| Propagation Delay (CO to C4) | 16 ns |
The device can operate with either active HIGH or active LOW operands (positive or negative logic).
For active HIGH logic, the unused Carry input must be tied LOW; for active LOW logic, it must be tied HIGH.