SN54F251B, SN74F251B

1-OF-8 DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCTOBER 1993

2–4

POST OFFICE BOX 655303

recommended operating conditions

SN54F251B

SN74F251B

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

0.8

0.8

V

IIK

Input clamp current

–18

–18

mA

IOH

High-level output current

–3

–3

mA

IOL

Low-level output current

20

24

mA

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

SN54F251B

SN74F251B

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 5V

IOH = – 1 mA

2.5

3.4

2.5

3.4

VOH

VCC = 4.5 V

IOH = – 3 mA

2.4

3.3

2.4

3.3

V

VCC = 4.75 V,

IOH = – 1 mA to – 3 mA

2.7

VOL

VCC =4 5V

IOL = 20 mA

0.3

0.5

V

VOL

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

50

µA

IOZL

VCC = 5.5 V,

VO = 0.5 V

–50

–50

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 = 0.5 V

– 0.6

– 0.6

mA

IOS‡

VCC = 5.5 V,

VO = 0

–60

–150

–60

–150

mA

ICC

VCC = 5.5 V,

Condition A

15

22

15

22

mA

ICC

CC

See Note 2

Condition B

16

24

16

24

mA

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

‡ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.

NOTE 2: ICC is measured with the outputs open under the following conditions:

A. Select input and data input at 4.5 V, output control grounded

B. All inputs at 4.5 V