SGS Thomson Microelectronics M74HC238 Datasheet

.HIGH SPEED

tPD= 14 ns(TYP.) AT VCC=5V

.LOWPOWER DISSIPATION

ICC=4µA(MAX.) AT TA=25°C

.HIGH NOISEIMMUNITY

V

NIH=VNIL

=28%VCC(MIN.)

.OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.SYMMETRICAL OUTPUT IMPEDANCE

|IOH|=IOL=4 mA (MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATING VOLTAGE RANGE

VCC(OPR)= 2 V TO 6 V

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS238

M54HC238
M74HC238

3 TO 8 LINE DECODER

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC 238F1R M74H C238M1R
M74HC 238B1R M74HC2 38C1R

F1R

(CeramicPackage)

C1R

(Chip Carrier)

DESCRIPTION

TheM54/74HC238 is ahigh speed CMOS3 to8 line
decoderfabricated insilicongateC2MOStechnology.
It has the same high speed performance of LSTTL
combined with trueCMOSlowpower consumption.If
thedeviceisenabled,3 binary selectinputs(A,B and
C)determinewhichoneofoutputswillgohigh.Enable
inputG1 is held ”Low” or either G2A or G2B is held
”High” decoding function isinhibited andallthe 8 out­putsgolow.Three enable inputs areprovided toease
cascade connection and application of this address
decoder inmemory systems.

Allinputs areequipped with protectioncircuitsagainst
staticdischarge and transient excess voltage.

NC =
No Internal
Connection

PIN CONNECTIONS(top view)

October 1993

1/10

M54/M74HC238

INPUT AND OUTPUT EQUIVALENT CIRCUIT

IEC LOGIC SYMBOLS

PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1, 2, 3 A, B, C Data Inputs

4, 5 G2A G2B Enable Input (Active

LOW)

6 G1 Data Enable Input

(Active HIGH)

15, 14, 13,

12, 11, 10, 9,

7
8 GND Ground (0V)

16 V

Y0 to Y7 Outputs

CC

Positive Supply Voltage

TRUTH TABLE

INPUTS

ENABLE SELECT

G2B G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

XXLXXXLLLLLLLL NONE
XHXXXXLLLLLLLL NONE
HXXXXXLLLLLLLL NONE
LLHLLLHLLLLLLL Y0
LLHLLHLHLLLLLL Y1
LLHLHLLLHLLLLL Y2
LLHLHHLLLHLLLL Y3
LLHHLLLLLLHLLL Y4
LLHHLHLLLLLHLL Y5
LLHHHLLLLLLLHL Y6
LLHHHHLLLLLLLH Y7

X: Don’tCare

2/10

OUTPUS SELECTED

OUTPUT

LOGIC DIAGRAM

M54/M74HC238

ABSOLU TE MAXIMUM RATING S

Symbol Parameter Value Unit

V

CC

V

V

O

I

IK

I

OK

I

O

I

or I

CC

P

D

T

stg

T

AbsoluteMaximumRatingsarethose values beyond whichdamage tothedevice mayoccur. Functionaloperation under theseconditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300 mW by 10mW/oC: 65oCto85oC

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 (10 sec) 300

L

o

C

o

C

3/10

M54/M74HC238

RECO MM ENDED OPERAT IN G C ONDITIONS

Symbol Parameter Value Unit

V

V

V

T

t

r,tf

DC SPECIFICATIO NS

Symbol Parameter

V

IH

V

V

OH

V

OL

I

I

CC

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: M54HC Series

op

M74HC Series

CC
CC

-55 to +125

-40 to +85

Input Rise and Fall Time VCC= 2 V 0 to 1000 ns

V

= 4.5 V 0 to 500

CC

V

= 6 V 0 to 400

CC

Test Conditions Value

T

High Level Input
Voltage

=25oC

V

(V)

CC

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

-40 to 85oC
74HC

-55 to 125oC

6.0 4.2 4.2 4.2

Low Level Input

IL

Voltage

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

High Level
Output Voltage

Low Level Output
Voltage

Input Leakage

I

Current
Quiescent Supply

2.0
V

=

I

4.5 4.4 4.5 4.4 4.4

6.0 5.9 6.0 5.9 5.9

4.5 I

6.0 I

2.0

4.5 0.0 0.1 0.1 0.1

6.0 0.0 0.1 0.1 0.1

4.5 I

6.0 I

6.0

IO=-20 µA

V

IH

or

V

IL

=-4.0 mA 4.18 4.31 4.13 4.10

O

=-5.2 mA 5.68 5.8 5.63 5.60

O

=

V

I

IO=20µA

V

IH

or

V

IL

= 4.0 mA 0.17 0.26 0.33 0.40

O

= 5.2 mA 0.18 0.26 0.33 0.40

O

VI=VCCor GND ±0.1 ±1 ±1 µA

1.9 2.0 1.9 1.9

0.0 0.1 0.1 0.1

6.0 VI=VCCor GND 4 40 80 µA

Current

54HC

V
V

o

C

o

C

Unit

V

V

V

V

4/10

M54/M74HC238

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

Test Conditions Value

=25oC

T

Symbol Parameter

t
t

TLH
THL

Output Transition
Time

V

CC

(V)

2.0 30 75 95 110

4.5 8151922

A

54HC and 74HC

Min. Typ. Max. Min. Max. Min. Max.

6.0 7131619

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

C

C

PD

Propagation
Delay Time
(A, B, C - Y)

Propagation
Delay Time
(G1 - Y)

Propagation
Delay Time
(G2 - Y)

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

2.0 50 150 190 225

4.5 17 30 38 45

6.0 15 26 32 38

2.0 50 150 190 225

4.5 17 30 38 45

6.0 15 26 32 38

2.0 50 150 190 225

4.5 17 30 38 45

6.0 15 26 32 38

53

Capacitance

(*) CPDisdefinedas the value ofthe IC’sinternal equivalent capacitance which is calculated from the operating current consumption without load.
(RefertoTest Circuit).Average opertingcurrentcan be obtained by thefollowingequation. ICC(opr) = CPD•VCC•fIN+I

-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

ns

ns

ns

ns

pF

WAVEFORM

TEST CIRCUIT ICC(Opr.)SWITCHING CHARACTERISTICS TEST

INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHINGCHARACTERISTICSTEST.

5/10

M54/M74HC238

Plastic DIP16 (0.25) MECHANICAL DATA

DIM.

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

a1 0.51 0.020

B 0.77 1.65 0.030 0.065

b 0.5 0.020

b1 0.25 0.010

D 20 0.787
E 8.5 0.335

e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 0.050

mm inch

6/10

P001C

Ceramic DIP16/1 MECHANICAL DATA

M54/M74HC238

DIM.

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

A 20 0.787
B 7 0.276
D 3.3 0.130
E 0.38 0.015

e3 17.78 0.700

F 2.29 2.79 0.090 0.110
G 0.4 0.55 0.016 0.022
H 1.17 1.52 0.046 0.060

L 0.22 0.31 0.009 0.012
M 0.51 1.27 0.020 0.050
N 10.3 0.406

P 7.8 8.05 0.307 0.317

Q 5.08 0.200

mm inch

P053D

7/10

M54/M74HC238

SO16 (Narrow) MECHANICAL DATA

DIM.

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

A 1.75 0.068
a1 0.1 0.2 0.004 0.007
a2 1.65 0.064

b 0.35 0.46 0.013 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.019

c1 45° (typ.)

D 9.8 10 0.385 0.393

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 8.89 0.350

F 3.8 4.0 0.149 0.157

G 4.6 5.3 0.181 0.208

L 0.5 1.27 0.019 0.050

M 0.62 0.024

S8°(max.)

mm inch

8/10

P013H

PLCC20 MECHANICAL DATA

M54/M74HC238

DIM.

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

A 9.78 10.03 0.385 0.395

B 8.89 9.04 0.350 0.356

D 4.2 4.57 0.165 0.180
d1 2.54 0.100
d2 0.56 0.022

E 7.37 8.38 0.290 0.330

e 1.27 0.050

e3 5.08 0.200

F 0.38 0.015
G 0.101 0.004
M 1.27 0.050

M1 1.14 0.045

mm inch

P027A

9/10

M54/M74HC238

Information furnished is believed tobe accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringementof patents or other rights of third parties which may results from its use. No
license is granted byimplication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publicationare subject to changewithout notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsare notauthorized foruse ascritical componentsinlife support devicesorsystems withoutexpress
written approval of SGS-THOMSONMicroelectonics.

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