SN54LS490, SN74LS490

DUAL 4-BIT DECADE COUNTERS

SDLS125A – OCTOBER 1976 – REVISED JULY 1998

6

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS†

SN74LS490

SN74LS490

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, VIH = 2 V,

VIL = VILmax

2.5

3.4

2.7

3.4

V

VOL

Low level output voltage

VCC = MIN,

VIH 2V

IOL = 4 mA

0.25

0.4

0.25

0.4

V

VOL

Low-level output voltage

VIH = 2 V,

VIL = VILmax

IOL = 8 mA

0.35

0.5

V

II

Input current

at maximum

CLR, SET9

VCC = MAX,

VI = 7 V

0.1

0.1

mA

II

at maximum

input voltage

CLK

VCC = MAX,

VI = 5.5 V

0.2

0.2

mA

IIH

High-level

CLR, SET9

VCC = MAX

VI =2 7V

20

20

µA

IIH

g

input current

CLK

VCC = MAX,

VI = 2.7 V

100

100

µA

IIL

Low-level

CLR, SET9

VCC = MAX

VI =0 4V

–0.4

–0.4

mA

IIL

input current

CLK

VCC = MAX,

VI = 0.4 V

–1.6

–1.6

mA

IOS§

Short-circuit output current

VCC = MAX

–20

–100

–20

–100

mA

ICC

Supply current

VCC = MAX,

See Note 3

15

26

15

26

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, and duration of the short circuit should not exceed one second.

NOTE 3: ICC is measured with all outputs open, both CLR inputs grounded following momentary connection to 4.5 V, and all other inputs

grounded.

PARAMETER

FROM

TO

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fmax

CLK

QA

CL = 15 pF,

RL = 2 kΩ

25

35

MHz

tPLH

CLK

QA

CL =15 pF

RL =2kΩ

12

20

ns

tPHL

CLK

QA

CL = 15 pF,

RL = 2 kΩ

13

20

ns

tPLH

CLK

QB QD

CL =15 pF

RL =2kΩ

24

39

ns

tPHL

CLK

QB, QD

CL = 15 pF,

RL = 2 kΩ

26

39

ns

tPLH

CLK

QC

CL =15 pF

RL =2kΩ

32

54

ns

tPHL

CLK

QC

CL = 15 pF,

RL = 2 kΩ

36

54

ns

tPHL

CLR

Any

CL = 15 pF,

RL = 2 kΩ

24

39

ns

tPLH

SET9

QA, QD

CL =15 pF

RL =2kΩ

24

39

ns

tPHL

SET9

QB, QC

CL = 15 pF,

RL = 2 kΩ

20

36

ns