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Directly Compatible for Use With:

SN54LS181/SN74LS181,

SN545281/SN745281, SN54S381,

SN74S381, SN545481/SN745481

description

“The SN545182 and SN745182 are high-speed, look-ahead carry generators capable of anticipating a carry across

four binary adders or group of adders. They are cascadable to perform full look-ahead across n-bit adders. Carry, generate-

carry, and propagate-carry functions are provided as enumerated in the pin designation table above.

When used in conjunction with the ‘LS181 or ‘S181 arithmetic logic unit (ALU), these generators provide high-speed

carry look-ahead capability for any word length. Each ‘S182 generates the look-ahead (anticipated carry) across a

group of four ALUs and, in addition, other carry look-ahead circuits may be employed to anticipate carry across sections

of four look-ahead packages up to n-bits. The method of cascading S182 circuits to perform multilevel look-ahead

is illustrated under typical application data.

The carry functions (inputs, outputs, generate, and propagate) of the look-ahead generators are implemented in the.

compatible forms for direct connection to the ALU. Reinterpretations of carry functions as explained on the 'LS181

and S181 data sheet are also applicable to and compatible with the look-ahead generator. Logic equations for the

'5182 are: