描述 Description

The ′F283 is a full adder that performs the addition of two 4-bit binary words. The sum ( ) outputs are provided for each bit and the resultant carry (C4) output is obtained from the fourth bit.The device features full internal look-ahead across all four bits generating the carry term C4 in typically 5.7 ns. This capability provides the system designer with partial look-ahead performance at the economy and reduced package count of a ripple-carry implementation.The adder logic, including the carry, is implemented in its true form. End-around carry can be accomplished without the need for logic or level inversion.The ′F283 can be used with either all-active-high (positive logic) or all-active-low (negative logic) operands.The SN54F283 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F283 is characterized for operation from 0°C to 70°C.

特性 Features

? Full-Carry Look-Ahead Across the Four Bits
? Systems Achieve Partial Look-Ahead Performance With the Economy of Ripple Carry
? Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs