General description
The 74HC283 is a high-speed Si-gate CMOS device and is pin compatible with low power Schottky TTL (LSTTL). The 74HC283 is specified in compliance with JEDEC standard no. 7A.
The 74HC283 adds two 4-bit binary words (An plus Bn) plus the incoming carry (CIN).
The binary sum appears on the sum outputs (S1 to S4) and the out-going carry (COUT)
according to the equation:

CIN + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = = S1 + 2S2 + 4S3 + 8S4 + 16COUT Where (+) = plus.

FEATUREs
■ High-speed 4-bit binary addition
■ Cascadable in 4-bit increments
■ Fast internal look-ahead carry
■ Low-power dissipation
■ Complies with JEDEC standard no. 7A
■ ESD protection:
   ◆ HBM EIA/JESD22-A114-B exceeds 2000 V
   ◆ MM EIA/JESD22-A115-A exceeds 200 V.
■ Multiple package options
■ Specified from −40 °C to +80 °C and from −40 °C to +125 °C.