SN54ALS561A, SN74ALS561A

SYNCHRONOUS 4-BIT COUNTERS

WITH 3-STATE OUTPUTS

SDAS225A – DECEMBER 1982 – REVISED JANUARY 1995

5

POST OFFICE BOX 655303

7 V

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

7 V

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

– 55

°C to 125°C

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

SN74ALS561A

0

°C to 70°C

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

Storage temperature range

– 65

°C to 150°C

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

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

recommended operating conditions

SN54ALS561A

SN74ALS561A

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

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

Q outputs

–1

– 2.6

mA

IOH

High-level output current

CCO and RCO

– 0.4

– 0.4

mA

IOL

Low level output current

Q outputs

12

24

mA

IOL

Low-level output current

CCO and RCO

4

8

mA

fclock

Clock frequency

0

20

0

30

MHz

ACLR or ALOAD low

20

15

tw

Pulse duration

CLK high

20

16.5

ns

CLK low

25

16.5

↑

ENP ENT

High

25

20

↑

ENP, ENT

Low

25

20

↑

Data at A, B, C, D

25

20

t

Setup time before CLK

↑

SCLR

Low

21

15

ns

tsu

Setup time before CLK

↑

SCLR

High (inactive)

35

30

ns

SLOAD

Low

20

15

SLOAD

High (inactive)

35

30

ACLR or ALOAD inactive

12

10

th

Hold time after CLK

↑ for data, ENP, ENT, SCLR, or SLOAD

0

0

ns

TA

Operating free-air temperature

–55

125

0

70

°C