SN54147, SN54148, SN54LS147, SN54LS148

SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148

10LINE TO 4LINE AND 8LINE TO 3LINE PRIORITY ENCODERS

SDLS053B − OCTOBER 1976 − REVISED MAY 2004

9

POST OFFICE BOX 655303

PARAMETER†

FROM

(INPUT)

TO

(OUTPUT)

WAVEFORM

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

1–7

A0, A1, or A2

In-phase output

10

15

ns

tPHL

1–7

A0, A1, or A2

In-phase output

9

14

ns

tPLH

1–7

A0, A1, or A2

Out-of-phase output

13

19

ns

tPHL

1–7

A0, A1, or A2

Out-of-phase output

12

19

ns

tPLH

0–7

EO

Out-of-phase output

6

10

ns

tPHL

0–7

EO

Out-of-phase output

14

25

ns

tPLH

0–7

GS

In-phase output

CL = 15 pF,

18

30

ns

tPHL

0–7

GS

In-phase output

CL = 15 pF,

RL = 400 Ω

14

25

ns

tPLH

EI

A0, A1, or A2

In-phase output

RL = 400

10

15

ns

tPHL

EI

A0, A1, or A2

In-phase output

10

15

ns

tPLH

EI

GS

In-phase output

8

12

ns

tPHL

EI

GS

In-phase output

10

15

ns

tPLH

EI

EO

In-phase output

10

15

ns

tPHL

EI

EO

In-phase output

17

30

ns

† tPLH = propagation delay time, low-to-high-level output.

tPHL = propagation delay time, high-to-low-level output.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS†

SN54LS’

SN74LS’

UNIT

PARAMETER

TEST CONDITIONS†

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.7

0.8

V

VIK

Input clamp voltage

VCC = MIN,

II = −18 mA

−1.5

−1.5

V

VOH

High-level output voltage

VCC = MIN,

VIL = 0.8 V,

VIH = 2 V,

IOH = −400 µA

2.5

3.4

2.7

3.4

V

VOL

Low-level output voltage

VCC = MIN,

VIH = 2 V,

IOL = 4 mA

0.25

0.4

0.25

0.4

V

VOL

Low-level output voltage

CC

VIH = 2 V,

VIL = VIL MAX

IOL = 8 mA

0.35

0.5

V

II

Input current at

maximum input

’LS148 inputs 1–7

VCC = MAX,

VI = 7 V

0.2

0.2

mA

II

maximum input

voltage

All other inputs

VCC = MAX,

VI = 7 V

0.1

0.1

mA

IIH

High-level input

’LS148 inputs 1–7

VCC = MAX,

VI = 2.7 V

40

40

A

IIH

High-level input

current

All other inputs

VCC = MAX,

VI = 2.7 V

20

20

µA

IIL

Low-level input

’LS148 inputs 1–7

VCC = MAX,

VI = 0.4 V

−0.8

−0.8

mA

IIL

Low-level input

current

All other inputs

VCC = MAX,

VI = 0.4 V

−0.4

−0.4

mA

IOS

Short-circuit output current§

VCC = MAX

−20

−100

−20

−100

mA

ICC

Supply current

VCC = MAX

Condition 1

12

20

12

20

mA

ICC

Supply current

VCC = MAX

(See Note 6)

Condition 2

10

17

10

17

mA

† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

‡ All typical values are at VCC = 5 V, TA = 25°C.

§ Not more than one output should be shorted at a time.

NOTE 6: For ’LS147, ICC (Condition 1) is measured with input 7 grounded, other inputs and outputs open; ICC (Condition 2) is measured with

all inputs and outputs open. For ’LS148, ICC (Condition 1) is measured with inputs 7 and EI grounded, other inputs and outputs open;

ICC (Condition 2) is measured with all inputs and outputs open.