Datasheet M74HC181 Datasheet (SGS Thomson Microelectronics)

ARITHMETIC LOGIC UNIT/FUNCTION GENERATOR

.HIGH SPEED

tPD= 13 ns(TYP.) AT VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) at TA=25°C

.HIGH NOISE IMMUNITY

V

NIH=VNIL

=28%VCC(MIN.)

.OUTPUTDRIVE CAPABILITY

10 LSTTL LOADS

.SYMMETRICAL OUTPUT IMPEDANCE

IOH =IOL= 4 mA (MIN.)

.BALANCEDPROPAGATIONDELAYS

t

PLH=tPHL

.WIDE OPERATING VOLTAGE RANGE

VCC(OPR)= 2 V to 6 V

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS181

DESCRIPTION

The74HC181 is a high speed CMOSARITHMETIC
LOGIC UNIT/FUNCTION GENERATOR fabricated
withsilicongateC2MOStechnology. It has the same
highspeedperformanceofLSTTLcombinedwithtrue
CMOS low power consumption. These circuits per­form 16 binary arithmetic operations on two 4-bit
words as shown intables 1 and2. These operations
areselectedby the fourfunction-select lines (S0, S1,
S2,S3) andinclude addition, subtraction, decrement,
and straight transfer. When performing arithmetic
manipulations, theinternal carriesmustbeenabled by
applying a low-levelvoltage to themode control input
(M).Afullcarrylook-ahead schemeismadeavailable
in these devices for fast, simultaneous carry gener­ationby meansof two cascade-outputs (pins15 and

17)forthefourbitsinthepackage. Whenusedincon­junction withthe M54HC182 orM74HC182, full carry
look-ahead circuits,high-speed arithmetic operations
canbeperformed. These circuits willaccomodate ac­tive-highoractive-lowdata,ifthepindesignations are
interpreted as shown below. Subtraction is accom­plished by 1,s complement addition where the 1’s
complement ofthesubtrahendisgenerated internally.
Theresultant output is1–B–1, whichrequires anend­around or forced carry to produce A–B.The181can
alsobeutilized as a comparator. The A = B outputis
internally decoded fromthe functionoutputs (F0, F1,
F2, F3) so thatwhen two words of equal magnitude
areappliedattheAandB inputs, itwillassumeahigh
level toindicated equality (A =B).TheALUshould be

M74HC181

B1R

(Plastic Package)

ORDER CODES :

M74HC 181M1R M74HC 181B1R

PIN CONNECTIONS(top view)

* Open drain OutputStructure

M1R

(MicroPackage)

October 1993

1/13

M74HC181

DESCRIPTION (continued)

inthesubtractmodewithCn=Hwhenperforming this
comparison. The A =B output isopen-drain sothat it
canbe wire-AND connected togiveacomparison for
morethatfourbits. Thecarry output (Cn+4) canalso
be used to supply relative magnitude information.
Again,theALUshould beplacedinthesubtractmode
byplacing thefunction selectinputsS3,S2, S1,S0at
L,H, H, L, respectively. These circuits have beende­signed to notonlyincorporate allofthedesigner’s re-

INPUT AND OUTPUT EQUIVALENT CIRCUITS

quirements for arithmetic operations, but also to pro­vide 16 possible functions of two Boolean variables
withouttheuse ofexternalcircuitry.These logic func­tionsareselectedbyuseofthefourfunction-selectin­puts(S0,S1, S2,S3) withthemode-control input (M)
atahighlevel to disable the internal carry.Allinputs
areequipped withprotectioncircuitsagainst staticdis­charge and transient excessvoltage.

ONLY OUTPUT A = B

IEC LOGIC SYMBOLS

PIN NUMBER 2 1 23 22 21 20 19 18 9 10 11 13 7 16 15 17

ACTIVE LOW DATA (Table 1) A0 B0 A1 B1 A2 B2 A3 B3 F0 F1 F2 F3 Cn Cn + 4 P G

ACTIVE HIGH DATA (Table 1) A0 B0 A1 B1 A2 B2 A3 B3 F0 F1 F2 F3 Cn Cn + 4 X Y

PIN DESCRIPTI ON

PIN No SYMBOL NAME AND FUNCTION

2, 23, 21, 19 A0 to A3 Word A Inputs
1, 22, 20, 18 B0 to B3 Word B Inputs

6, 5, 4, 3 S0 to S3 Function Select Inputs

7 Cn Inv. Carry Input
8 M Mode Control Input

9, 10, 11, 13 F0 to F3 Function Outputs

14 A = B Comparator Output
15 P Carry Propagate Output
16 Cn + 4 Inv. Carry Output
17 G Carry Generate Output
12 GND Ground (0V)
24 V

CC

Positive Supply Voltage

2/13

Input Cn Output Cn + 4 Active LOW Data (Figure 1) Active HIGH Data (Figure 2)

HHA≥BA≤B
HLA<BA>B

LHA>BA<B
LLA≤BA≥B

TRUTH TABLE 1

M74HC181

Selection

S3 S2 S1 S0 Cn = L (no carry) Cn = H (with carry)

L L L L F = A F = A Minus 1 F = A
L L L H F = AB F = AB Minus 1 F = AB
L L H L F = A + B F = AB Minus 1 F = (AB)
L L H H F = 1 F = Minus 1 (2’s Compl) F = Zero
L H L L F=A+B F=APlus (A + B) F = A Plus (A + B) Plus 1
L H L H F = B F = AB Plus (A + B) F = AB Plus (A + B) Plus 1
LHHLF=A⊕B F = A Minus B Minus 1 F = A Minus B

L H H H F=A+B F=A+B F=(A+B)Plus 1
H L L L F = AB F = A Plus (A + B) F = A Plus (A + B) Plus 1
HLLHF=A⊕B F = A Plus B F = A Plus B Plus 1
H L H L F = B F = AB Plus (A + B) F = AB Plus (A + B) Plus 1
H L H H F=A+B F=A+B F=(A+B)Plus 1
H H L L F = 0 F = A Plus A * F = A Plus A Plus 1
H H L H F = AB F = AB Plus A F = AB Plus A Plus 1
H H H L F = AB F = AB Plus A F = AB Plus A Plus 1
H H H H F = A F = A F = A Plus 1

* Eachbit is shiftedto the nextmore significantposition.

M = H Logic

Functions

ACTIVE LOW DATA

M = L: Arithmetic Operations

FIGURE 1

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M74HC181

TRUTH TABLE 2

Selection

S3 S2 S1 S0 Cn = H (no carry) Cn = L (with carry)

L L L L F = A F = A F = A Plus 1

L L L H F=A+B F=A+B F=(A+B)Plus 1

L L H L F=AB F=A+B F=(A+B)Plus 1

L L H H F = 0 F = Minus 1 (2’s Compl) F = Zero

L H L L F = AB F = A Plus (AB) F = A Plus AB Plus 1

L H L H F = B F = (A + B) Plus AB F = (A + B) Plus (AB) Plus 1

LHHLF=A⊕B F = A Minus B Minus 1 F = A Minus B

L H H H F = AB F = AB Minus 1 F = AB
H L L L F = A + B F = A Plus AB F = A Plus AB Plus 1
HLLHF=A⊕B F = A Plus B F = A Plus B Plus 1
H L H L F = B F = (A + B) Plus AB F = (A + B) Plus AB Plus 1
H L H H F = AB F = AB Minus 1 F = AB
H H L L F = 1 F = A Plus A * F = A Plus A Plus 1
H H L H F = A + B F = (A + B) Plus A F = (A + B) Plus A Plus 1
H H H L F = A + B F = (A + B) Plus A F = (A + B) Plus A Plus 1
H H H H F = A F = A Minus 1 F = A

* Eachbit is shiftedto the nextmore significantposition.

M = H Logic

Functions

ACTIVE HIGH DATA

M = L: Arithmetic Operations

FIGURE 2

4/13

LOGIC DIAGRAM

M74HC181

5/13

M74HC181

ABSOLU TE M AXIMU M R AT INGS

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

I

or I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethosevalues beyond whichdamage tothedevice mayoccur. Functional operationundertheseconditionisnotimplied.
(*)500 mW:≅ 65oC derate to 300mW by 10mW/oC: 65oCto85oC

RECO MM ENDED OPERAT IN G CO NDITIO NS

Symbol Parameter Value Unit

V

CC

V

I

V

O

T

op

t

r,tf

Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA

GND

Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10sec) 300

L

Supply Voltage 2 to 6 V
Input Voltage 0 to V
Output Voltage 0 to V

CC
CC

Operating Temperature -40 to +85
Input Rise and Fall Time VCC= 2 V 0 to 1000 ns

V

= 4.5 V 0 to 500

CC

= 6 V 0 to 400

V

CC

o

C

o

C

V
V

o

C

6/13

DC SPECIFICATIONS

Symbol Parameter

V

V

V

V

I

High Level Input Voltage 2.0 1.5 1.5

IH

Low Level Input

IL

Voltage

High Level Output Voltage

OH

(except A = B output)

Low Level Output Voltage 2.0

OL

Input Leakage Current 6.0 VI=VCCor GND ±0.1 ±1 µA

I

I

Quiescent Supply Current 6.0 VI=VCCor GND 4 40 µA

CC

M74HC181

Test Conditions Value

V

CC

(V)

4.5 3.15 3.15

6.0 4.2 4.2

2.0 0.5 0.5

4.5 1.35 1.35

6.0 1.8 1.8

2.0

4.5 4.4 4.5 4.4

6.0 5.9 6.0 5.9

4.5 I

6.0 I

4.5 0.0 0.1 0.1

6.0 0.0 0.1 0.1

4.5 I

6.0 I

V

I

V

IH

or

V

IL

V

I

V

IH

or

V

IL

=

IO=-20 µA

=-4.0 mA 4.18 4.31 4.13

O

=-5.2 mA 5.68 5.8 5.63

O

=

IO=20µA

= 4.0 mA 0.17 0.26 0.33

O

= 5.2 mA 0.18 0.26 0.33

O

TA=25oC -40 to 85oC

Min. Typ. Max. Min. Max.

1.9 2.0 1.9

0.0 0.1 0.1

Unit

V

V

V

V

7/13

M74HC181

AC ELECTRICAL CHARACTERISTICS (CL=50pF,Inputtr=tf=6ns)

Test Conditions Value

=25oC

T

Symbol Parameter

t
t

TLH
THL

Output Transition Time 2.0 30 75 95

V

CC

(V)

4.5 8 15 19

A

54HC and 74HC

Min. Typ. Max. Min. Max.

6.0 7 13 16

t
t

PLH
PHL

Propagation Delay Time
(1)

2.0 54 120 150

4.5 16 24 30

6.0 13 20 26

t
t

PLH
PHL

Propagation Delay Time
(2)

2.0 90 215 270

4.5 26 43 54

6.0 20 37 46

t
t

PLH
PHL

Propagation Delay Time
(3)

2.0 97 215 270

4.5 27 43 54

6.0 21 37 46

t
t

PLH
PHL

Propagation Delay Time
(4)

2.0 80 180 225

4.5 23 36 45

6.0 18 31 38

t
t

PLH
PHL

Propagation Delay Time
(5)

2.0 81 190 240

4.5 24 38 48

6.0 19 32 41

t
t

PLH
PHL

Propagation Delay Time
(6)

2.0 80 180 225

4.5 23 36 45

6.0 18 31 38

t
t

PLH
PHL

Propagation Delay Time
(7)

2.0 80 170 215

4.5 23 34 43

6.0 18 29 37

t
t

PLH
PHL

Propagation Delay Time
(8)

2.0 80 170 215

4.5 23 34 43

6.0 18 29 37

t
t

PLH
PHL

Propagation Delay Time
(9)

2.0 95 220 275

4.5 27 44 55

6.0 21 37 47

t
t

PLH
PHL

Propagation Delay Time
(10)

2.0 95 220 275

4.5 27 44 55

6.0 21 37 47

t
t

PLH
PHL

Propagation Delay Time
(11)

2.0 86 200 250

4.5 24 40 50

6.0 18 34 43

t
t

PLZ
PZL

Propagation Delay Time
(12)

2.0
=1kΩ

R

4.5 27 42 53

L

92 210 265

6.0 27 36 45

C

C

PD

(*) CPDisdefined as the value ofthe IC’s internal equivalent capacitance which is calculated fromthe operating currentconsumption withoutload.
(RefertoTest Circuit).Average operting current can be obtained bythe followingequation. ICC(opr) = CPD•VCC•fIN+I

Input Capacitance 5 10 10 pF

IN

(*) Power Dissipation Capacitance 195 pF

-40 to 85oC
74HC

CC

Unit

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

8/13

PROPAGATION DELAY TIME TEST CONDITIONS

Test No INPUT OUTPUT Test Conditions

(1) Cn Cn + 4
(2) Any A or B Cn + 4 M = GND, S0 = S3 = V

, S1 = S2 GND (SUM mode)

CC

(3) Any A or B Cn + 4 M = GND, S0 = S3 = GND, S1 = S2 V
(4) Cn Any F M = GND (SUM or DIFF mode)
(5) Any A or B G M = GND, S0 = S3 = V

, S1 = S2 GND (SUM mode)

CC

(6) Any A or B G M = GND, S0 = S3 = GND, S1 = S2 V
(7) Any A or B F M = GND, S0 = S3 = V

, S1 = S2 GND (SUM mode)

CC

(8) Any A or B F M = GND, S0 = S3 = GND, S1 = S2 V
(9) Ai or Bi Fi M = GND, S0 = S3 = V

, S1 = S2 GND (SUM mode)

CC

(10) Ai or Bi Fi M = GND, S0 = S3 = GND, S1 = S2 V
(11) Ai or Bi Fi M = V

(Logic mode)

CC

(12) Any A or B A = B M = GND, S0 = S3 = GND, S1 = S2 V

SWITCHING CHARACTERISTICS TEST WAVEFORM

M74HC181

(DIFF mode)

CC

(DIFF mode)

CC

(DIFF mode)

CC

(DIFF mode)

CC

(DIFF mode)

CC

9/13

M74HC181

TEST CIRCUIT ICC(Opr.)

InputCondition :
A0, A1,A2, A3, S0, S3, Cn= V
B1, B2,B3, S1, S2, M = GND

INPUTWAVEFORMIS THE SAMEAS THAT IN CASE OFSWITCHINGCHARACTERISTICSTEST.

DD

10/13

Plastic DIP24 (0.25) MECHANICAL DATA

M74HC181

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.63 0.025

b 0.45 0.018

b1 0.23 0.31 0.009 0.012

b2 1.27 0.050

D 32.2 1.268

E 15.2 16.68 0.598 0.657

e 2.54 0.100

e3 27.94 1.100

F 14.1 0.555

I 4.445 0.175

L 3.3 0.130

mm inch

P043A

11/13

M74HC181

SO24 MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.65 0.104
a1 0.10 0.20 0.004 0.007
a2 2.45 0.096

b 0.35 0.49 0.013 0.019

b1 0.23 0.32 0.009 0.012

C 0.50 0.020
c1 45° (typ.)

D 15.20 15.60 0.598 0.614

E 10.00 10.65 0.393 0.420

e 1.27 0.05

e3 13.97 0.55

F 7.40 7.60 0.291 0.299
L 0.50 1.27 0.19 0.050

S8°(max.)

mm inch

L

A

a2

b

e3

D

24 13

112

e

F

s

a1

c1

b1

C

E

12/13

M74HC181

Information furnished is believed to be accurate and reliable.However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement ofpatents or other rights of third parties which may results from its use. No
license isgranted by implicationor otherwise underany patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to changewithout notice. Thispublication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts are not authorizedforuse ascritical componentsinlife supportdevices orsystems withoutexpress
written approval of SGS-THOMSON Microelectonics.

 1994 SGS-THOMSON Microelectronics - All RightsReserved

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