MM54HC181 datasheet(3/10 Pages) NSC

3 / 10 page

General Description (Continued)

TLF5320 – 3

FIGURE 2

Table II

Selection

Active Low Data

MeHMeL Arithmetic Operations

Logic

Functions

CneL (no carry)

CneH (with carry)

LLLL

FeA

FeA Minus 1

FeA

LLL

F eAB

FeAB Minus 1

FeAB

LHL

FeA a BFeAB Minus 1

Fe(AB)

Fe1FeMinus 1 (2’s Compl)

FeZero

LHL

FeA a B

FeA Plus (A a B)FeA Plus (A a B) Plus 1

LHLH

FeB

FeAB Plus (A a B)

FeAB Plus (A a B) Plus 1

FeA a B

FeA Minus B Minus 1

FeA Minus B

HHH

FeA a B

Fe(A a B Plus 1

LLL

FeABFeA Plus (A a B)

FeA Plus (A a B) Plus 1

FeA a BFeA Plus B

FeA Plus B Plus 1

HLHL

FeBFeAB Plus (A a B)

FeAB Plus (A a B) Plus 1

HLH

FeA a BFeA a BFe(A a B) Plus 1

Fe0FeA Plus A

FeA Plus A Plus 1

HLH

FeAB

FeAB Plus A

FeAB Plus A Plus 1

HHH

FeAB

FeAB Plus A

FeAB Plus A Plus 1

HHHH

FeAFeAFeA Plus 1

Each bit is shifted to the next more significant position

Number

Package Count

Carry Method

Typical

Arithmetic

Look Ahead

Between

Bits

Addition Times

Logic Units

Carry Generators

ALU’s

1 to 4

20 ns

None

5 to 8

30 ns

Ripple

9 to 16

30 ns

3 or 4

Full Look-Ahead

17 to 64

50 ns

5 to 16

2 to 5

Full Look-Ahead

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