74F382 datasheet(6/12 Pages) PHILIPS

Part #	74F382

Description	Arithmetic Logic Unit

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product specification

74F382

Arithmetic logic unit

1990 Jul 12

6

FUNCTION SELECT TABLE

SELECT

OPERATING

S0

S1

S2

MODE

L

Clear

H

L

B minus A

L

H

L

A minus B

H

L

A Plus B

L

H

A

B

H

L

H

A + B

L

H

AB

H

Preset

H = High voltage level

L

= Low voltage level

Table 1. 16-Bit Delay Tabulation

PATH SEGMENT

TOWARD

F

OUTPUT

Cn+4, OVR

Ai or Bi to Cn+4

6.5ns

Cn to Cn+4

6.3ns

Cn to Cn+4

6.3ns

Cn to F

8.1ns

–

Cn to Cn+4, OVR

–

8.0ns

Total Delay

27.2ns

27.1ns

Table 2. Two’s Complement Arithmetic

MSB

LSB

Numerical Values

L

0

L

H

1

L

H

L

2

L

H

3

L

H

L

4

L

H

L

H

5

L

H

L

6

L

H

7

H

L

–8

H

L

H

–7

H

L

H

L

–6

H

L

H

–5

H

L

–4

H

L

H

–3

H

L

–2

H

–1

H = High voltage level

L

= Low voltage level

APPLICATION

AB

Cn

SF00939

CIN

S

F

74F382

F0–F3

44

3

A0–A3

B0–B3

AB

Cn

S

F

74F382

F4–F7

44

3

A4–A7

B4–B7

AB

Cn

S

F

74F382

F8–F11

44

3

A8–A11

B8–B11

AB

Cn

S

F

74F382

F12–F15

44

3

A12–A15

B12–B15

Cn+4

OVR

OVERFLOW

COUT

SELECT

Cn+4

Figure 1. 16-bit Look-ahead Carry ALU Expansion

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