HD74AC182RPEL 데이터 시트보기 (PDF) - Renesas Electronics

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HD74AC182RPEL

Carry Lookahead Generator

Renesas Electronics 

HD74AC182

Logic Symbol

P0 G0

P1 G1

P2 G2

P3 G3

G

Cn

P

Cn+x Cn+y Cn+z

Pin Names

Cn

G0, G2

G1

G3

P0, P1

P2

P3

Cn + x to Cn + z

G

P

Carry Input

Carry Generate Inputs (Active Low)

Carry Generate Input (Active Low)

Carry Generate Input (Active Low)

Carry Propagate Inputs (Active Low)

Carry Propagate Input (Active Low)

Carry Propagate Input (Active Low)

Carry Outputs

Carry Generate Output (Active Low)

Carry Propagate Output (Active Low)

Logic Diagram

Cn G0 P0

G1 P1

G2 P2

G3 P3

Cn+x

Cn+y

Cn+z

G

P

Please note that this diagram is provided only for the understanding of logic operations and should not be

used to estimate propagation delays.

Functional Description

The HD74AC182/HD74ACT182 carry lookahead generator accepts up to four pairs of Active Low Carry Propagate (P0

to P3) and Carry Generate (G0 to G3) signals and an Active High Carry input (Cn) and provides anticipated Active High

carries (Cn + x, Cn + y , Cn + z) across four groups of binary adders. The HD74AC182/HD74ACT182 also has Active Low

Carry Propagate (P) and Carry Generate (G) outputs which may be used for further level of lookahead. The logic

equations provided at the outputs are:

Rev.2.00, Jul.16.2004, page 2 of 6

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