Datasheet SN74F251BD, SN74F251BDR, SN74F251BN Datasheet (Texas Instruments)

SN54F251B, SN74F251B

1-OF-8 DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCTOBER 1993

Copyright  1993, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• 3-State Versions of SN54F151B and

SN74F151B

• 3-State Outputs Interface Directly With

System Bus

• Performs Parallel-to-Serial Conversion

• Complementary Outputs Provide True and

Inverted Data

• Package Options Include Plastic

Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs

description

These data selectors/multiplexers contain full
binary decoding to select one of eight data
sources and feature strobe-controlled
complementary outputs. The 3-state outputs can
interface with and drive data lines of bus­organized systems. When the strobe (G

) input is
high, both outputs are in a high-impedance state
in which both the upper and lower transistors of
each totem-pole output are off, and the output
neither drives nor loads the bus significantly.

The SN54F251B is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74F251B is characterized for
operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

SELECT

STROBE

OUTPUTS

C B A

G

Y W

X X X H Z Z
L LL L D0 D0
L LH L D1 D1
L HL L D2 D2
L HH L D3 D3
H LL L D4 D4
H LH L D5 D5
H HL L D6 D6
H H H L D7 D7

D0, D1, .. . D7 = the level of the respective D input.

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

D3
D2
D1
D0

Y

W

G

GND

V

CC

D4
D5
D6
D7
A
B
C

SN54F251B ...J PACKAGE

SN74F251B ...D OR N PACKAGE

(TOP VIEW)

3212019

910111213

4
5
6
7
8

18
17
16
15
14

D5
D6
NC
D7
A

D1
D0

NC

Y

W

SN54F251B .. . FK PACKAGE

(TOP VIEW)

D2D3NC

C

B

D4

G

GND

NC

NC – No internal connection

V

CC

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCT OBER 1993

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

MUX

EN

7

0

11

A

10

B

2

9

C

0

4

D0

1

3

D1

2

2

D2

3

1

D3

4

15

D4

5

14

D5

6

13

D6

7

12

D7

0
7

G

W

6

Y

5

G

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

SN54F251B, SN74F251B

1-OF-8 DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCTOBER 1993

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

Data

Select

(Binary)

Data

Inputs

D0

D1

D2

D3

D4

D5

D6

D7

G

W

Y

C

A

B

7

4

3

2

1

15

14

13

12

11

10

9

5
6

Pin numbers shown are for the D, J, and N packages.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage range, V

CC

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state –0.5 V to V

CC

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

Current into any output in the low state: SN54F251B 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F251B 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54F251B –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F251B 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.

NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.

SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCT OBER 1993

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

SN54F251B SN74F251B

MIN NOM MAX MIN NOM MAX

UNIT

V

CC

Supply voltage 4.5 5 5.5 4.5 5 5.5 V

V

IH

High-level input voltage 2 2 V

V

IL

Low-level input voltage 0.8 0.8 V

I

IK

Input clamp current –18 –18 mA

I

OH

High-level output current –3 –3 mA

I

OL

Low-level output current 20 24 mA

T

A

Operating free-air temperature –55 125 0 70 °C

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

SN54F251B SN74F251B

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

V

IK

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

IOH = – 1 mA 2.5 3.4 2.5 3.4

V

OH

V

CC

=

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

IOL = 20 mA 0.3 0.5

V

OL

V

CC

= 4.5

V

IOL = 24 mA 0.35 0.5

V

I

OZH

VCC = 5.5 V, VO = 2.7 V 50 50 µA

I

OZL

VCC = 5.5 V, VO = 0.5 V –50 –50 µA

I

I

VCC = 5.5 V, VI = 7 V 0.1 0.1 mA

I

IH

VCC = 5.5 V, VI = 2.7 V 20 20 µA

I

IL

VCC = 5.5 V, VI = 0.5 V – 0.6 – 0.6 mA

I

OS

‡

VCC = 5.5 V, VO = 0 –60 –150 –60 –150 mA
VCC = 5.5 V,

Condition A 15 22 15 22

I

CC

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

SN54F251B, SN74F251B

1-OF-8 DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCTOBER 1993

2–5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics (see Note 3)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500Ω,
R2 = 500 Ω,
TA = MIN to MAX

†

UNIT

′F251B SN54F251B SN74F251B

MIN TYP MAX MIN MAX MIN MAX

t

PLH

3.5 5.4 9 3.5 11.5 3.5 9.5

t

PHL

A, B, or C

W

2.5 4.4 7.5 2.5 8 2.5 7.5

ns

t

PLH

4.5 6.2 10.5 3.5 14 4 12.5

t

PHL

A, B, or C

Y

4 6 8.5 3 10.9 3.5 9

ns

t

PLH

2.5 3.7 6.5 1.8 8 2 7

t

PHL

Any D

W

1 1.9 4 1 6 1 5

ns

t

PLH

3 3.8 7 2.3 9 2.3 8

t

PHL

Any D

Y

3 4.5 7 2.3 9 2.5 8

ns

t

PZH

2.5 3.6 6 2 7 2 7

t

PZL

G

W

2.5 3.8 6 2.5 7.5 2.5 6.5

ns

t

PHZ

1.9 2.5 5.5 1.4 6 1.5 6

t

PLZ

G

W

1 2.4 4.5 1 5 1 4.5

ns

t

PZH

3.4 4.8 7 2.7 8.5 2.9 8.5

t

PZL

G

Y

2.9 4 7.5 2.6 9 2.6 8

ns

t

PHZ

1.9 2.5 5.5 1.7 5.5 1.8 5.5

t

PLZ

G

Y

1 2.3 4.5 1 5.5 1 4.5

ns

†

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

NOTE 3: Load circuits and waveforms are shown in Section 1.

SN54F251B, SN74F251B
1-OF-8 DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS

SDFS066A – MARCH 1987 – REVISED OCT OBER 1993

2–6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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