Datasheet M74HCT138B1R Specification

3 TO8 LINE DECODER (INVERTING)

.HIGH SPEED

tPD= 16 ns(TYP.) at VCC=5V

.LOWPOWER DISSIPATION

ICC=4µAATTA=25°C

.OUTPUTDRIVE CAPABILITY

10 LSTTLLOADS

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.SYMMETRICALOUTPUT IMPEDANCE

|IOH|=I

OL

.COMPATIBLE WITHTTL OUTPUTS

VIH= 2V (MIN.) VIL= 0.8V (MAX)

.PIN ANDFUNCTION COMPATIBLE

WITH 54/74LS138

DESCRIPTION

The M54/74HC138 is a high speed CMOS 3 TO 8
LINE DECODER fabricated in silicon gate C2MOS
technology. It has the same high speed perform­anceofLSTTL combinedwithtrueCMOSlowpower
consumption. If the device is enabled, 3 binaryse­lect inputs(A, Band C)determine whichone ofthe
outputs will go low.If enableinput G1 is held lowor
eitherG2A or G2B is held high, the decoding func­tion is inhibited andall the8 outputs go high. Three
enableinputsare providedtoeasecascadeconnec­tion and application of address decoders for mem­ory systems.Allinputs are equipped with protection
circuitsagainst static discharge and tran- sient ex­cess voltage.This integrated circuit has input and
outputcharacteristics that arefully compatiblewith
54/74 LSTTL logic families. M54/74HCT devices
are designed to directly interface HSC2MOS sys­tems with TTL and NMOS components. They are
also plugin replacements for LSTTL devicesgiving
a reduction of power consumption.

M54HCT138
M74HCT138

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC T138F1R M74H CT138M1R
M74HC T138B 1 R M74HCT 138C1 R

PIN CONNECTIONS(top view)

F1R

(CeramicPackage)

C1R

(Chip Carrier)

INPUT AND OUTPUT EQUIVALENT CIRCUIT

February 1993

NC =
No Internal
Connection

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M54/M74HCT138

TRUTH TABLE

INPUTS

ENABLE SELECT

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

XXLXXXHHHHHHHH
XHXXXXHHHHHHHH
HXXXXXHHHHHHHH

LLHL L LLHHHHHHH
LLHL LHHLHHHHHH
LLHLHLHHLHHHHH
LLHLHHHHHLHHHH
LLHHL LHHHHLHHH
LLHHLHHHHHHLHH
LLHHHLHHHHHHLH
LLHHHHHHHHHHHL

X:Don’t Care

OUTPUTS

IEC LOGIC SYMBOLPIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

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

4, 5 G2A, G2B Enable Inputs

6 G1 Enable Input

15, 14, 13,
12, 11, 10,

9, 7

8 GND Ground (0V)

16 V

Y0 to Y7 Outputs

CC

Positive Supply Voltage

LOGI C DIAG RAM

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M54/M74HCT138

ABSOLU TE M AXI MU 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

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamagetothedevice mayoccur. Functionaloperationunder theseconditionisnotimplied.
(*)500 mW:≅ 65oC derateto 300 mWby 10mW/oC: 65oCto85oC

RECO MM ENDED O PERAT IN G CONDI TI O 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 OutputDiode 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

Supply Voltage 4.5 to 5.5 V
Input Voltage 0 to V
Output Voltage 0 to V
Operating Temperature: M54HC Series

M74HC Series

CC
CC

-55 to +125

-40 to +85

Input Rise and Fall Time (VCC= 4.5 to 5.5V) 0 to 500 ns

o

C

o

C

V
V

o

C

o

C

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M54/M74HCT138

DC SPECIFICATIO NS

Symbol Parameter

V

V

V

V

I

∆I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level

OH

Output Voltage

Low Level Output

OL

Voltage

Input Leakage

I

I

Current
Quiescent Supply

CC

Current
Additional worst

CC

case supply
current

Test Conditions Value

V

(V)

4.5

CC

=25oC

A

54HC and 74HC

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

2.0 2.0 2.0 V

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

T

to

5.5

4.5

0.8 0.8 0.8 V

to

5.5
VI=

IO=-20 µA 4.4 4.5 4.4 4.4

V

IH

4.5

or

I

=-4.0 mA 4.18 4.31 4.13 4.10

O

V

IL

VI=

IO=20µA 0.0 0.1 0.1 0.1

V

IH

4.5

or

I

= 4.0 mA 0.17 0.26 0.33 0.4

O

V

IL

VI=VCCor GND ±0.1 ±1 ±1 µA

5.5

5.5 VI=VCCor GND 4 40 80 µA

5.5 Per Input pin

2.0 2.9 3.0 mA

VI= 0.5V or

V

= 2.4V

I

Other Inputs at

VCCor GND

V

V

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M54/M74HCT138

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

Test Conditions Value

T

=25oC

Symbol Parameter

t
t

t
t

TLH
THL

PLH
PHL

Output Transition
Time

Propagation
Delay Time

V

CC

(V)

4.5 8151922

4.5 17 30 38 45

A

54HC and 74HC

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

(A, B, C - Y)

t
t

PLH
PHL

Propagation
Delay Time

4.5 16 30 38 45

(G1 - Y)

t
t

PLH
PHL

Propagation
Delay Time

4.5 19 30 38 45

(G2 - Y)

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

52

Capacitance

(*) CPDisdefined as the valueof the IC’s internal equivalent capacitance whichis calculated from the operating current consumption without load.
(Referto Test Circuit).Average opertingcurrentcan be obtained by the followingequation. ICC(opr) = CPD•VCC•fIN+I

-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

ns

ns

ns

ns

pF

SWITCHING CHARACTERISTICS TEST WAVEFORM

TEST CIRCUIT ICC(Opr.)

INPUT WAVEFORMIS THE SAME
AS THATIN CASE OF SWITCHING
CHARACTERISTICSTEST.

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M54/M74HCT138

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

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P001C

Ceramic DIP16/1 MECHANICAL DATA

M54/M74HCT138

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

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M54/M74HCT138

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/M74HCT138

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

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M54/M74HCT138

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 of patents or other rights of third partieswhich may results from its use. No
license is granted byimplication or otherwise under any patent or patentrights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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