SN54147, SN54148, SN54LS147, SN54LS148

SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148

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

SDLS053B − OCTOBER 1976 − REVISED MAY 2004

8

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS†

’147

’148

UNIT

PARAMETER

TEST CONDITIONS†

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

VIK

Input clamp voltage

VCC = MIN,

II = −12 mA

−1.5

−1.5

V

VOH

High-level output voltage

VCC = MIN,

VIL = 0.8 V,

VIH = 2 V,

IOH = −800 µA

2.4

3.3

2.4

3.3

V

VOL

Low-level output voltage

VCC = MIN,

VIL = 0.8 V,

VIH = 2 V,

IOL = 16 mA

0.2

0.4

0.2

0.4

V

II

Input current at maximum input

voltage

VCC = MIN,

VI = 5.5 V

1

1

mA

IIH

High-level input

0 input

VCC = MAX,

VI = 2.4 V

40

A

IIH

High-level input

current

Any input except 0

VCC = MAX,

VI = 2.4 V

40

80

µA

IIL

Low-level input

0 input

VCC = MAX,

VI = 0.4 V

−1.6

mA

IIL

Low-level input

current

Any input except 0

VCC = MAX,

VI = 0.4 V

−1.6

−3.2

mA

IOS

Short-circuit output current§

VCC = MAX

−35

−85

−35

−85

mA

ICC

Supply current

VCC = MAX

Condition 1

50

70

40

60

mA

ICC

Supply current

VCC = MAX

(See Note 5)

Condition 2

42

62

35

55

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 5: For ’147, 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 ’148, 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.

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

WAVEFORM

TEST

CONDITIONS

MIN

TYP

MAX

UNIT

tPLH

Any

Any

In-phase output

9

14

ns

tPHL

Any

Any

In-phase output

CL = 15 pF,

7

11

ns

tPLH

Any

Any

Out-of-phase output

CL = 15 pF,

RL = 400 Ω

13

19

ns

tPHL

Any

Any

Out-of-phase output

RL = 400

12

19

ns