SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDAS214E – DECEMBER 1982 – REVISED AUGUST 2002

4

POST OFFICE BOX 655303

recommended operating conditions

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

V

VIH

High-level input voltage

2

V

VIL

Low level input voltage

SN54ALS240A

0.7

V

VIL

Low-level input voltage

SN74ALS240A, ’AS240A

0.8

V

IOH

High level output current

SN54ALS240A, SN54AS240A

– 12

mA

IOH

High-level output current

SN74ALS240A, SN74AS240A

– 15

mA

SN54ALS240A

12

SN74ALS240A

24

IOL

Low-level output current

SN74ALS240A

48†

mA

SN54AS240A

48

SN74AS240A

64

TA

Operating free-air temperature

SN54ALS240A, SN54AS240A

– 55

125

°C

TA

O erating free-air tem erature

SN74ALS240A, SN74AS240A

0

70

°C

† Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS240A

SN74ALS240A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

– 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = – 0.4 mA

VCC – 2

VCC – 2

VOH

IOH = – 3 mA

2.4

3.2

2.4

3.2

V

VOH

VCC = 4.5 V

IOH = – 12 mA

2

V

IOH = – 15 mA

2

IOL = 12 mA

0.25

0.4

0.25

0.4

VOL

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOL = 48 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

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

VCC = 5.5 V,

VI = 0.4 V

– 0.1

– 0.1

mA

IO§

VCC = 5.5 V,

VO = 2.25 V

– 20

– 112

– 30

– 112

mA

Outputs high

4

11

4

11

ICC

VCC = 5.5 V

Outputs low

13

23

13

23

mA

Outputs disabled

14

25

14

25

† Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V

‡ 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.