XINLUDA XD74LS283

The XD74LS283 adders are electrically and functionally; only the arrangement of the terminals has been changed. These improved full adders perform the addition of two 4-bit binary words. The sum outputs are provided for each bit and the resultant carry is obtained from the fourth bit. These adders feature full internal look-ahead across all four bits generating the carry term in ten nanoseconds, typically, for the XD74LS283 This capability provides the system designer with partial lookahead 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.

• Full-Carry Look-Ahead Across the Four Bits
• Systems Achieve Partial Look-Ahead Performance with the Economy of Ripple Carry
• Supply Voltage and Ground on Corner Pins to Simplify P-C Board Layout