MC10H179

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3

(G2 + P3) G3

G3 5

P3 13

G2 9

P2 12

G1 7

P1 10

G0 4

P0 14

LOGIC DIAGRAM

TYPICAL APPLICATIONS

The MC10H179 is a high−speed, low−power, standard

MECL complex function that is designed to perform the

look−ahead carry function. This device can be used with the

MC10H181 4−bit ALU directly, or with the MC10H180

dual arithmetic unit in any computer, instrumentation or

digital communication application requiring high speed

arithmetic operation on long words.

When used with the MC10H181, the MC10H179

performs a second order or higher look−ahead. Figure 2

shows a 16−bit look−ahead carry arithmetic unit. Second

order carry is valuable for longer binary words. As an

example, addition of two 32−bit words is improved from 30

nanoseconds with ripple−carry techniques. A block diagram

of a 32−bit ALU is shown in Figure 1. The MC10H179 may

also be used in many other applications. It can, for example,

reduce system package count when used to generate

functions of several variables.

Add Time =

18 ns typ

MC10H179

MC10H179

ALU

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ALU

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ALU

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ALU

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ALU

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ALU

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ALU

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ALU

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FIGURE 1 − 32−BIT ALU WITH CARRY LOOK−AHEAD