Datasheet M74HC148 Datasheet (SGS Thomson Microelectronics)

8 TO 3 LINE PRIORITY ENCODER

.HIGH SPEED

tPD= 15 ns(TYP.) AT VCC=5V

.LOWPOWERDISSIPATION

ICC=4µA(MAX.) AT TA=25°C

.HIGH NOISEIMMUNITY

V

NIH=VNIL

=28%VCC(MIN.)

.OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.SYMMETRICALOUTPUT IMPEDANCE

IOH =IOL= 4 mA(MIN.)

.BALANCEDPROPAGATION DELAYS

t

PLH=tPHL

.WIDE OPERATINGVOLTAGE RANGE

VCC(OPR)= 2V TO 6 V

.PIN ANDFUNCTION COMPATIBLE

WITH 54/74LS148

DESCRIPTION

The M54/74HC148 is a high speedCMOS 8-TO-3
LINE PRIORITY ENCODER fabricated in silicon
gate C2MOStechnology.

It hasthesame high speedperformance for LSTTL
combined withtrue CMOSlowpower consumption.
The M54/74HC148 encodes eight data lines to
three-line (4-2-1) binary (octal). Cascading circuitry
(enable input EI and enable output EO) has been
provided to allow octal expansion without the need
for external circuitry. Data inputs are active at the
low logiclevel.

All inputs are equipped with protection circuits
against static discharge and transient excess volt­age.

M54HC148
M74HC148

B1R

(PlasticPackage)

M1R

(MicroPackage)

ORDER CODES :

M54HC 148F1R M74H C148M1R
M74HC 148B1R M74HC1 48C1R

PIN CONNECTIONS(top view)

F1R

(CeramicPackage)

C1R

(Chip Carrier)

INPUT AND OUTPUT EQUIVALENT CIRCUIT

October 1992

NC =
No Internal
Connection

1/11

M54/M74HC148

TRUTH TABLE

INPUTS OUTPUTS

E101234567A2A1A0GSE0

HXXXXXXXXHHHHH

LHHHHHHHHHHHHL
LXXXXXXXLLLLLH
LXXXXXXLHLLHLH
LXXXXXLHHLHLLH
LXXXXLHHHLHHLH
LXXXLHHHHHL L LH
LXXLHHHHHHLLHLH
LXLHHHHHHHHLLH
LLHHHHHHHHHHLH

X:Don’t Care

LOGI C DIAGRAM

2/11

M54/M74HC148

PIN DESCRIPTION

IEC LOGIC SYMBOL

PIN No SYMBOL NAME AND FUNCTION

9, 7, 6 A0 to A2 Data Outputs

11, 12, 13,

0 to 7 Data Inputs

1, 2, 3, 4,

10
15 EO Enable Output

5 EI Enable Input

14 GS Priority Flag Output

8 GND Ground (0V)

16 V

CC

Positive Supply Voltage

ABSOLU TE MAXIMU M RAT 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

AbsoluteMaximumRatingsarethose values beyondwhichdamage tothedevicemayoccur. Functionaloperationunder these conditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300mWby 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

RECO MM ENDED OPERATIN G C ONDI TI O NS

Symbol Parameter Value Unit

V

T

t

V

V

r,tf

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

V
V

o

C

o

C

3/11

M54/M74HC148

DC SPECIFICATIO NS

Symbol Parameter

V

V

V

V

I

High Level Input

IH

Voltage

Low Level Input

IL

Voltage

High Level

OH

Output Voltage

Low Level Output

OL

Voltage

I

Input Leakage

I

Current
Quiescent Supply

CC

Current

Test Conditions Value

V

(V)

CC

=25oC

A

54HC and 74HC

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

-40 to 85oC
74HC

-55 to 125oC
54HC

Unit

T

2.0 1.5 1.5 1.5

4.5 3.15 3.15 3.15

6.0 4.2 4.2 4.2

2.0 0.5 0.5 0.5

4.5 1.35 1.35 1.35

6.0 1.8 1.8 1.8

2.0

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

=

V

I

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

V

V

V

V

4/11

M54/M74HC148

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

Test Conditions Value

T

=25oC

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

Propagation
Delay Time
(In - A0, A1, A2)

t
t

PLH
PHL

Propagation
Delay Time
(In - EO, GS)

t
t

PLH
PHL

Propagation
Delay Time
(EI - EO)

t
t

PLH
PHL

Propagation
Delay Time
(EI - GS)

t
t

PLH
PHL

Propagation
Delay Time
(EI - A0, A1, A2)

C

C

PD

Input Capacitance 5 10 10 10 pF

IN

(*) Power Dissipation

2.0 60 150 190 225

4.5 19 30 38 45

6.0 16 26 32 38

2.0 60 150 190 225

4.5 19 30 38 45

6.0 16 26 32 38

2.0 40 115 145 175

4.5 14 23 29 35

6.0 12 20 25 30

2.0 40 115 145 175

4.5 14 23 29 35

6.0 12 20 25 30

2.0 40 115 145 175

4.5 14 23 29 35

6.0 12 20 25 30

60

Capacitance

(*) CPDisdefined as the value ofthe IC’sinternal equivalent capacitance whichis calculated fromthe operatingcurrent consumption without load.
(Referto Test Circuit). Average operting current canbe obtained bythe followingequation. ICC(opr) = CPD•VCC•fIN+I

-40 to 85oC
74HC

-55 to 125oC
54HC

CC

Unit

ns

ns

ns

ns

ns

ns

pF

SWITCHING CHARACTERISTICS TEST
CIRCUIT

TEST CIRCUIT ICC(Opr.)

INPUTWAVEFORM ISTHE SAME AS THATIN CASEOF
SWITCHINGCHARACTERISTICSTEST.

5/11

M54/M74HC148

TYPICAL APPLICATION

4-BITCASCADE CONNECTION

6/11

Plastic DIP16 (0.25) MECHANICAL DATA

M54/M74HC148

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

P001C

7/11

M54/M74HC148

Ceramic DIP16/1 MECHANICAL DATA

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

8/11

P053D

SO16 (Narrow) MECHANICAL DATA

M54/M74HC148

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

P013H

9/11

M54/M74HC148

PLCC20 MECHANICAL DATA

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

10/11

P027A

M54/M74HC148

Information furnishedis believed to be accurate and reliable. However, SGS-THOMSON Microelectronicsassumes no responsability for the
consequences of useof suchinformation nor forany infringement of patents or other rights of third parties which may results from its use. No
license is granted byimplication or otherwiseunder any patentor patentrights ofSGS-THOMSON Microelectronics.Specificationsmentioned
in this publication are subjectto changewithout notice. This publication supersedes andreplaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsinlife supportdevices orsystemswithoutexpress
written approval of SGS-THOMSON Microelectonics.

 1994SGS-THOMSON Microelectronics- All Rights Reserved

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11/11