Datasheet MC74F381DW, MC74F381N, MC54F381J Datasheet (Motorola)

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Printed on:Mon, Feb 6, 1995 09:49:45
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Document:MC74F381 (5) VIEW
Last saved on:Fri, Feb 3, 1995 16:06:52

4-179

FAST AND LS TTL DATA

4-BIT ARITHMETIC LOGIC UNIT

The MC54/74F381 performs three arithmetic and three logic operations on
two 4-bit words, A and B. Two additional Select input codes force the Function
outputs LOW or HIGH. Carry Propagate and Generate outputs are provided
for use with the F182 Carry Lookahead Generator for high-speed expansion
to longer word lengths. For ripple expansion, refer to the F382 ALU data
sheet.

• Low Input Loading Minimizes Drive Requirements

• Performs Six Arithmetic and Logic Functions

• Selectable Low (Clear) and High (Preset) Functions

• Carry Generate and Propagate Outputs for use with

Carry Lookahead Generator

CONNECTION DIAGRAM

18 17 16 15 14 13

1 2 3 4 5 6

7

20 19

8

V

CC

A

1

A2B2A3B

3

P

C

n

G

B1A0B0S0S1S2F

0

9 10

F1GND

12 11

F3F

2

LOGIC SYMBOL

15

7
6
5

13
14

C

n

S

2

S

1

S

0

F0F1F2F

3

3 161718194 1 2

A0B0A1B1A2B2A3B

3

G
P

VCC = PIN 20
GND = PIN 10

8 12119

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 54, 74 4.5 5.0 5.5 V

54 –55 25 125

TAOperating Ambient Temperature Range

74 0 25 70

°C

I

OH

Output Current — High 54, 74 –1.0 mA

I

OL

Output Current — Low 54, 74 20 mA

MC54/74F381

4-BIT ARITHMETIC LOGIC UNIT

FAST SCHOTTKY TTL

ORDERING INFORMATION

MC54FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03

4-180

FAST AND LS TTL DATA

MC54/74F381

LOGIC DIAGRAM

Please note that this diagram is provided
only for the understanding of logic
operations and should not be used to
estimate propagation delays.

C

n

B

0

A

0

B

1

A

1

B

2

A

2

B

3

A

3

S

0

S

1

S

2

F

0

F

1

F

2

F

3

P

G
OVR

Cn+4

F381
ONLY

F382
ONLY

4-181

FAST AND LS TTL DATA

MC54/74F381

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min Typ Max

Unit

Test Conditions

V

IH

Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage

V

IL

Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage

V

IK

Input Clamp Diode Voltage –1.2 V IIN = –18 mA VCC = MIN

54, 74 2.5 3.4 V IOH = –1.0 mA VCC = 4.5 V

VOHOutput HIGH Voltage

74 2.7 3.4 V IOH = –1.0 mA VCC = 4.75 V

V

OL

Output LOW Voltage 0.35 0.5 V IOL = 20 mA VCC = MIN

20 µA VIN = 2.7 V

IIHInput HIGH Current

100 µA VIN = 7.0 V

VCC = MAX

I

Input LOW Current
S0–S2 Inputs

–0.6 mA VIN = 0.5 V

VCC = MAX

I

IL

Other Inputs

–2.4 mA VIN = 0.5 V

VCC = MAX

I

OS

Output Short Circuit
Current (Note 2)

–60 –150 mA V

OUT

= 0 V VCC = MAX

I

CC

Power Supply Current 59 89 mA

S0–S2 = GND;
Other Inputs HIGH

VCC = MAX

NOTES:

1. For conditions such as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.

2. Not more than one output should be shorted at a time, nor for more than 1 second.

FUNCTIONAL DESCRIPTION

Signals applied to the Select inputs S0–S2 determine the
mode of operation, as indicated in the Function Select T able.
An extensive listing of input and output levels is shown in the
Truth Table. The circuit performs the arithmetic functions for
either active-HIGH or active-LOW operands, with output lev­els in the same convention. In the Subtract operating modes,
it is necessary to force a carry (HIGH for active-HIGH oper-

ands, LOW for active-LOW operands) into the Cn input of the
least significant package.

The Carry Generate (G

) and Carry Propagate (P) outputs
supply input signals to the F182 carry lookahead generator for
expansion to longer word length, as shown in Figure 1. Note
that an F382 ALU is used for the most significant package.
Typical delays for Figure 1 are given in Figure 2.

FUNCTION SELECT TABLE

Select

S

0

S

1

S

2

Operation

L L L Clear
H L L B Minus A
L H L A Minus B
H H L A Plus B
L L H A⊕B
H L H A + B
L H H AB
H H H Preset

H = HIGH Voltage Level L = LOW Voltage Level

4-182

FAST AND LS TTL DATA

MC54/74F381

SELECT

3

3

C

IN

A0–A3B0–B

3

A4–A7B4–B

7

A8–A11B8–B

11

A12–A15B12–B

15

4 4

G P

A B

C

n

S

F

F382

Cn+4
OVR

F12–F

15

F0–F

3

F4–F

7

F8–F

11

C

n

G0P

0

G1P1C

n+y

G2P2C

n+z

F182 CLA

OVERFLOW

C

n+z

C

OUT

3

4 4

A B

C

n

S

F

F381

3

4 4

A B

C

n

S

F

F381

3

4 4

A B

C

n

S

F

F381

G P G P

Figure 1. 16-Bit Lookahead Carry ALU Expansion

Toward

Output

Path Segment

Toward

F

Output

Cn + 4, OVR

Ai or Bi to P 7.2 ns 7.2 ns
P

i

to Cn + j (’F182)

6.2 ns 6.2 ns
Cn to F 8.1 ns —
Cn to Cn + 4 , OVR — 8.0 ns

Total Delay 21.5 ns 21.4 ns

Figure 2. 16-Bit Delay Tabulation

AC CHARACTERISTICS

54/74F 54F 74F

TA = +25°C TA = – 55 to +125°C TA = 0 to +70°C

VCC = +5.0 V VCC = 5.0 V ±10% VCC = 5.0 V ±10%

CL = 50 pF CL = 50 pF CL = 50 pF

Symbol

Parameter

Min Typ Max Min Max Min Max

Unit

t

PLH

Propagation Delay 2.5 8.1 12 2.5 15 2.5 13

t

PHL

Cn to F

i

2.5 5.7 8.0 2.5 11 2.5 9.0

ns

t

PLH

Propagation Delay 4.0 10.4 15 4.0 18 4.0 16

t

PHL

Any A or B to Any F 3.5 8.2 11 3.5 14 3.5 12

ns

t

PLH

Propagation 4.5 8.3 20 4.5 23.5 4.5 21.5

t

PHL

Si to F

i

4.0 8.2 13 4.0 16 4.0 14

ns

t

PLH

Propagation Delay 3.0 6.4 9.0 3.0 12 3.0 10

t

PHL

Ai or Bi to G 4.0 6.8 10 4.0 13 4.0 11

ns

t

PLH

Propagation Delay 2.5 7.2 10.5 2.5 13.5 2.5 11.5

t

PHL

Ai or Bi to P 3.5 6.5 9.5 3.5 12.5 3.5 10.5

ns

t

PLH

Propagation Delay 4.0 7.8 12 4.0 15 4.0 13

t

PHL

Si to G or P 4.5 10.2 13.5 4.5 16.5 4.5 14.5

ns

4-183

FAST AND LS TTL DATA

MC54/74F381

TRUTH TABLE

INPUTS OUTPUTS

FUNCTION S

0

S

1

S2C

n

A

n

B

n

F

0

F

1

F

2

F

3

G P

CLEAR 0 0 0 X X X 0 0 0 0 0 0

0 0 0 1 1 1 1 1 0
0 0 1 0 1 1 1 0 0
0 1 0 0 0 0 0 1 1
0 1 1 1 1 1 1 1 0

B MINUS A

100

1 0 0 0 0 0 0 1 0
1 0 1 1 1 1 1 0 0
1 1 0 1 0 0 0 1 1
1 1 1 0 0 0 0 1 0

0 0 0 1 1 1 1 1 0
0 0 1 0 0 0 0 1 1
0 1 0 0 1 1 1 0 0
0 1 1 1 1 1 1 1 0

A MINUS B

010

1 0 0 0 0 0 0 1 0
1 0 1 1 0 0 0 1 1
1 1 0 1 1 1 1 0 0
1 1 1 0 0 0 0 1 0

0 0 0 0 0 0 0 1 1
0 0 1 1 1 1 1 1 0
0 1 0 1 1 1 1 1 0
0 1 1 0 1 1 1 0 0

A PLUS B

110

1 0 0 1 0 0 0 1 1
1 0 1 0 0 0 0 1 0
1 1 0 0 0 0 0 1 0
1 1 1 1 1 1 1 0 0

X 0 0 0 0 0 0 0 0
X 0 1 1 1 1 1 1 1

A⊕B00

1

X 1 0 1 1 1 1 1 0
X 1 1 0 0 0 0 0 0

X 0 0 0 0 0 0 0 0
X 0 1 1 1 1 1 1 1

A+B10

1

X 1 0 1 1 1 1 1 1
X 1 1 1 1 1 1 1 0

X 0 0 0 0 0 0 0 0
X 0 1 0 0 0 0 1 1

AB01

1

X 1 0 0 0 0 0 0 0
X 1 1 1

1

1 1 1

0

X 0 0 1 1 1 1 1 1
X 0 1 1 1 1 1 1 1

PRESET

111

X 1 0 1 1 1 1 1 1
X 1 1 1 1 1 1 1 0

1 = HIGH Voltage Level
0 = LOW Voltage Level
X = Immaterial