This document describes the features and characteristics of Harris CD74HC283 and CD74HCT283 binary full adders, including adding two 4-bit binary numbers, full internal lookahead, fast ripple carry for economical expansion, operation with both positive and negative logic, wide operating temperature range, balanced propagation delay and transition times, significant power reduction compared to LSTTL logic ICs, etc.
The CD74HC283 (HC) and CD74HCT283 (HCT) are high‑speed CMOS 4‑bit binary full‑adder ICs that add two 4‑bit numbers and generate a carry‑out. They support both positive‑logic and negative‑logic configurations and provide fast ripple‑carry operation for economical expansion.
The devices are offered in 16‑lead PDIP and SOIC packages, operate over a temperature range of –55 °C to 125 °C, and support supply voltages of 2 V–6 V (HC) or 4.5 V–5.5 V (HCT). Electrical specifications include typical propagation delays of 160–240 ns and input/output voltage thresholds suitable for TTL and CMOS loads.
| Operating Temperature Range | -55 °C to 125 °C |
|---|---|
| Typical Propagation Delay (HC) | 160 ns to 240 ns |
They operate from –55 °C to 125 °C.