fclock Clock frequency

MHz

CLK high or low

tsu

Setup time

ns

VOL

V

IIL

VCC = 5.5 V,

VI = 0.4 V

mA

SN54ALS190, SN54ALS191, SN74ALS190, SN74ALS191

SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTERS

SDAS210 – D2661, DECEMBER 1982 – REVISED MAY 1986

POST OFFICE BOX 655303

6

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54ALS190, SN54ALS191

– 55

°C to 125°C

. . . . . . . . . . . . . . . . . . .

SN74ALS190, SN74ALS191

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

SN54ALS190

SN54ALS191

SN74ALS190

SN74ALS191

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.7

0.8

V

IOH

High-level output current

– 0.4

– 0.4

mA

IOL

Low-level output current

4

8

mA

’ALS190

0

20

0

25

’ALS191

0

20

0

30

’AS190

25

20

tw

Pulse duration

‘AS191

20

16.5

ns

LOAD low

25

20

Data before LOAD

↑

25

20

CTEN before CLK

↑

45

20

D/U before CLK

↑

45

20

LOAD inactive before CLK

↑

20

20

Data after LOAD

↑

5

5

tsu

Hold time

CTEN after CLK

↑

0

0

ns

D/U after CLK

↑

0

0

TA

Operating free-air temperature

–55

125

0

70

°C

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS190

SN54ALS191

SN74AAL190

SN74ALS191

UNIT

MIN

TYP†

MAX

MIN

TYP†

MAX

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.5

– 1.5

V

VOH

VCC = 4.5 V to 5.5 V,

IOH = – 0.4 mA

VCC –2

VCC –2

V

VCC = 4.5 V,

IOL = 4 mA

0.25

0.5

0.25

0.4

VCC = 4.5 V,

IOL = 8 mA

0.35

0.5

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

CTEN OR CLK

– 0.2

– 0.2

All others

– 0.1

– 0.1

IO‡

VCC = 5.5 V,

VO = 2.25 V

–30

–112

–30

–112

mA

ICC

VCC = 5.5 V,

All inputs at 0 V

12

22

12

22

mA

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

‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.