SN54ALS191A, SN74ALS191A

SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS

SDAS210C – DECEMBER 1982 – REVISED JULY 1996

6

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS191A

SN74ALS191A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

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

VOL

VCC =4 5V

IOL = 4 mA

0.25

0.4

0.25

0.4

V

VOL

VCC = 4.5 V

IOL = 8 mA

0.35

0.5

II

VCC = 5.5 V,

VI = 7 V

0.2

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

CTEN or CLK

VCC =5 5V

VI =0 4V

– 0.2

– 0.2

mA

IIL

All others

VCC = 5.5 V,

VI = 0.4 V

– 0.2

– 0.1

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

–20

–112

–30

–112

mA

ICC

VCC = 5.5 V,

All inputs at 0

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.

switching characteristics (see Figure 1)

PARAMETER

FROM

(OUTPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

TA = MIN to MAX§

UNIT

(OUTPUT)

(OUTPUT)

SN54ALS191A

SN74ALS191A

MIN

MAX

MIN

MAX

fmax

20

30

MHz

tPLH

LOAD

Any Q

7

37

7

30

ns

tPHL

LOAD

Any Q

8

34

8

30

ns

tPLH

ABCD

Any Q

3

25

3

21

ns

tPHL

A, B, C, D

Any Q

4

25

4

21

ns

tPLH

CLK

RCO

5

24

5

20

ns

tPHL

CLK

RCO

5

25

5

20

ns

tPLH

CLK

Any Q

3

26

3

18

ns

tPHL

CLK

Any Q

3

22

3

18

ns

tPLH

CLK

MAX/MIN

8

37

8

31

ns

tPHL

CLK

MAX/MIN

8

34

8

31

ns

tPLH

D/U

RCO

8

45

8

37

ns

tPHL

D/U

RCO

10

36

10

28

ns

tPLH

D/U

MAX/MIN

8

35

8

25

ns

tPHL

D/U

MAX/MIN

8

30

8

25

ns

tPLH

CTEN

RCO

4

21

4

18

ns

tPHL

CTEN

RCO

4

23

4

18

ns

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