SN54ALS561A, SN74ALS561A

SYNCHRONOUS 4-BIT COUNTERS

WITH 3-STATE OUTPUTS

SDAS225A – DECEMBER 1982 – REVISED JANUARY 1995

6

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS561A

SN74ALS561A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.5

– 1.5

V

All outputs

VCC = 4.5 V to 5.5 V,

IOH = – 0.4 mA

VCC –2

VCC –2

VOH

Q outputs

VCC =4 5V

IOH = – 1 mA

2.4

3.3

V

Q outputs

VCC = 4.5 V

IOH = – 2.6 mA

2.4

3.2

Q outputs

VCC =4 5V

IOL = 12 mA

0.25

0.4

0.25

0.4

VOL

Q outputs

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

VOL

CCO and RCO

VCC =4 5V

IOL = 4 mA

0.25

0.4

0.25

0.4

V

CCO and RCO

VCC = 4.5 V

IOL = 8 mA

0.35

0.5

IOZH

VCC = 5.5 V,

VO = 2.7 V

20

20

µA

IOZL

VCC = 5.5 V,

VO = 0.4 V

–20

–20

µA

II

ENP and ENT

VCC =5 5V

VI =7V

0.2

0.2

mA

II

Other inputs

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

ENP and ENT

VCC =5 5V

VI =2 7V

40

40

µA

IIH

Other inputs

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

VCC = 5.5 V,

VI = 0.4 V

– 0.2

– 0.2

mA

I ‡

CCO and RCO

VCC =5 5V

VO = 2 25 V

–15

–70

–15

–70

mA

IO‡

Q

VCC = 5.5 V,

VO = 2.25 V

–20

–112

–30

–112

mA

Outputs high

17

27

17

27

ICC

VCC = 5.5 V

Outputs low

21

33

21

33

mA

Outputs disabled

22

36

22

36

† 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.