Datasheet SN74LS147D, SN74LS147DR2, SN74LS147N, SN74LS148D, SN74LS148DR2 Datasheet (MOTOROLA)

 Semiconductor Components Industries, LLC, 1999

December, 1999 – Rev. 6

1 Publication Order Number:

SN74LS147/D

SN74LS147 SN74LS148

10-Line-to-4-Line
and 8-Line-to-3-Line
Priority Encoders

The SN74LS147 and the SN74LS148 are Priority Encoders. They
provide priority decoding of the inputs to ensure that only the highest
order data line is encoded. Both devices have data inputs and outputs
which are active at the low logic level.

The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The
implied decimal zero condition does not require an input condition
because zero is encoded when all nine data lines are at a high logic
level.

The LS148 encodes eight data lines to three-line (4-2-1) binary
(octal). By providing cascading circuitry (Enable Input EI and Enable
Output EO) octal expansion is allowed without needing external
circuitry.

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 4.75 5.0 5.25 V

T

A

Operating Ambient

T emperature Range

0 25 70 °C

I

OH

Output Current – High –0.4 mA

I

OL

Output Current – Low 8.0 mA

LOW

POWER

SCHOTTKY

Device Package Shipping

ORDERING INFORMATION

SN74LS147N 16 Pin DIP 2000 Units/Box
SN74LS147D 16 Pin

SOIC

D SUFFIX

CASE 751B

http://onsemi.com

2500/Tape & Reel

PLASTIC
N SUFFIX
CASE 648

16

1

16

1

SN74LS148N 16 Pin DIP
SN74LS148D 16 Pin

2000 Units/Box

2500/Tape & Reel

SN74LS147 SN74LS148

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2

SN74LS147

(TOP VIEW)

SN74LS148

(TOP VIEW)

4 5 6 7 8 C B GND

D3219AVCCNC

14 13 12 11 10 9

123456

7

16 15

8

D321 9

A4

5678CB

OUTPUT INPUTS OUTPUT

INPUTS OUTPUTS

4 5 6 7 E1 A2 A1 GND

V

CC

EO GS 3 2 1 0 A0

14 13 12 11 10 9

123456

7

16 15

8

EO GS 3 2 1 0

A04

56 7EIA2A1

OUTPUTS

INPUTS OUTPUT

INPUTS OUTPUTS

SN74LS147 SN74LS148

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3

SN74LS147

FUNCTION TABLE

INPUTS OUTPUTS

1 2 3 4 5 6 7 8 9 D C B A

H H H H H H H H H H H H H
X XXXXXXXLLHHL
X XXXXXXLHLHHH
X XXXXXLHHHLLL
X XXXXLHHHHLLH
X XXXLHHHHHLHL
X XXLHHHHHHLHH
X XLHHHHHHHHLL
X LHHHHHHHHHLH
L H H H H H H H H H H H L

SN74LS148

FUNCTION TABLE

INPUTS OUTPUTS

EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO

H X X X X X X X X H H H H H
L HHHHHHHH H HHH L
L XXXXXXXL L LL L H
L XXXXXXLH L LH L H
L XXXXXLHH L HL L H
L XXXXLHHH L HH L H
L XXXLHHHH H LLL H
L XXLHHHHH H LHL H
L XLHHHHHH H HL L H
L L H H H H H H H H H H L H

H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant

FUNCTIONAL BLOCK DIAGRAMS

SN74LS147 SN74LS148

1

2

3

4

5

6

7

8

9

(11)

(12)

(13)

(1)

(2)

(3)

(4)

(5)

(10)

(9)

(7)

(6)

(14)

A

B

C

D

0

1

2

3

4

5

6

7

EI

(10)

(11)

(12)

(13)

(1)

(2)

(3)

(4)

(5)

(15)

EO

(14)

GS

(8)

A0

(7)

A1

(6)

A2

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4

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 for
All Inputs

V

IL

Input LOW Voltage

0.8
V

Guaranteed Input LOW Voltage for
All Inputs

V

IK

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA

V

OH

Output HIGH Voltage 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = V

IH

or VIL per Truth Table

p

0.25 0.4 V IOL = 4.0 mA

VCC = VCC MIN,

VOLOutput LOW Voltage

0.35 0.5 V IOL = 8.0 mA

V

IN

=

V

IL

or

V

IH

per Truth Table

I

IH

Input HIGH Current

All Others
Inputs 1–7 (LS148)

20
40

µA VCC = MAX, VIN = 2.7 V

IH

All Others
Inputs 1–7 (LS148)

0.1

0.2

mA VCC = MAX, VIN = 7.0 V

I

IL

Input LOW Current

All Others
Inputs 1–7 (LS148)

–0.4
–0.8

mA VCC = MAX, VIN = 0.4 V

I

OS

Short Circuit Current (Note 1) –20 –100 mA VCC = MAX

I

CCH

Power Supply Current Output HIGH 17 mA VCC = MAX, All Inputs = 4.5 V

I

CCL

Output LOW 20 mA

VCC = MAX, Inputs 7 & E1 = GND
All Other Inputs = 4.5 V

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

SN74LS147 SN74LS148

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5

AC CHARACTERISTICS (V

CC

= 5.0 V, TA = 25°C)

SN74LS147

From To

Limits

Symbol

From

(Input)

To

(Output)

Waveform

Min Typ Max

Unit Test Conditions

t

PLH

In-phase

12 18

t

PHL

AnyAn

y

output

12 18

ns

CL = 15 pF,

t

PLH

Out-of-phase

21 33

L

RL = 2.0 kΩ

t

PHL

AnyAn

y

output

15 23

ns

SN74LS148

From To

Limits

Symbol

From

(Input)

To

(Output)

Waveform

Min Typ Max

Unit Test Conditions

t

PLH

In-phase

14 18

t

PHL

1 thru 7

A0, A1, or A2

output

15 25

ns

t

PLH

Out-of-phase

20 36

t

PHL

1 thru 7

A0, A1, or A2

output

16 29

ns

t

PLH

Out-of-phase

7.0 18

t

PHL

0 thru 7

EO

output

25 40

ns

t

PLH

In-phase

35 55

CL = 15 pF,
R

= 2.0 kΩ

t

PHL

0 thru 7

GS

output

9.0 21

ns

R

L

2.0 kΩ

t

PLH

In-phase

16 25

t

PHL

EI

A0, A1, or A2

output

12 25

ns

t

PLH

In-phase

12 17

t

PHL

EI

GS

output

14 36

ns

t

PLH

p

12 21

t

PHL

EI EO

In-hase

output

28
30

40
45

ns

(LS148)

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6

P ACKAGE DIMENSIONS

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

ISSUE R

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.

4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.

5. ROUNDED CORNERS OPTIONAL.

–A–

B

F

C

S

H

G

D

J

L

M

16 PL

SEATING

18

916

K

PLANE

–T–

M

A

M

0.25 (0.010) T

DIM MIN MAX MIN MAX

MILLIMETERSINCHES

A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01

____

SN74LS147 SN74LS148

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7

P ACKAGE DIMENSIONS

D SUFFIX

PLASTIC SOIC PACKAGE

CASE 751B–05

ISSUE J

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.

18

16 9

SEATING

PLANE

F

J

M

R

X 45

_

G

8 PLP

–B–

–A–

M

0.25 (0.010) B

S

–T–

D

K

C

16 PL

S

B

M

0.25 (0.010) A

S

T

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019

F 0.40 1.25 0.016 0.049

G 1.27 BSC 0.050 BSC

J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7

P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019

____

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8

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