NSC 54F251ALMQB, 54F251AFMQB, 54F251ADMQB, 54F251ADC Datasheet

TL/F/9504

54F/74F251A 8-Input Multiplexer with TRI-STATE Outputs

November 1994

54F/74F251A
8-Input Multiplexer with TRI-STATE

É

Outputs

General Description

The ’F251A is a high-speed 8-input digital multiplexer. It pro­vides, in one package, the ability to select one bit of data
from up to eight sources. It can be used as a universal func­tion generator to generate any logic function of four vari­ables. Both assertion and negation outputs are provided.

Features

Y

Multifunctional capability

Y

On-chip select logic decoding

Y

Inverting and non-inverting TRI-STATE outputs

Commercial Military

Package

Package Description

Number

74F251APC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line

54F251ADM (Note 2) J16A 16-Lead Ceramic Dual-In-Line

74F251ASC (Note 1) M16A 16-Lead (0.150×Wide) Molded Small Outline, JEDEC

74F251ASJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ

54F251AFM (Note 2) W16A 16-Lead Cerpack

54F251ALL (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C

Note 1: Devices also available in 13×reel. Use suffixeSCX and SJX.

Note 2: Military grade device with environmental and burn-in processing. Use suffix

e

DMQB, FMQB and LMQB.

Logic Symbols Connection Diagrams

TL/F/9504– 3

IEEE/IEC

TL/F/9504– 5

Pin Assignment for

DIP, SOIC and Flatpak

TL/F/9504– 1

Pin Assignment

for LCC

TL/F/9504– 2

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C

1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

Unit Loading/Fan Out

54F/74F

Pin Names Description

U.L. Input I

IH/IIL

HIGH/LOW Output IOH/I

OL

S0–S

2

Select Inputs 1.0/1.0 20 mA/b0.6 mA

OE

TRI-STATE Output Enable Input (Active LOW) 1.0/1.0 20 mA/b0.6 mA

I

0–I7

Multiplexer Inputs 1.0/1.0 20 mA/b0.6 mA
Z TRI-STATE Multiplexer Output 150/40 (33.3)b3 mA/24 mA (20 mA)
Z

Complementary TRI-STATE Multiplexer Output 150/40 (33.3)b3 mA/24 mA (20 mA)

Functional Description

This device is a logical implementation of a single-pole, 8­position switch with the switch position controlled by the
state of three Select inputs, S

0,S1,S2

. Both assertion and
negation outputs are provided. The Output Enable input
(OE

) is active LOW. When it is activated, the logic function

provided at the output is:

Z

e

OE#(I

0

#

S

0

#

S

1

#

S

2

a

I

1

#

S

0

#

S

1

#

S

2

a

I

2

#

S

0

#

S

1

#

S

2

a

I

3

#

S

0

#

S

1

#

S

2

a

I

4

#

S

0

#

S

1

#

S

2

a

I

5

#

S

0

#

S

1

#

S

2

a

I

6

#

S

0

#

S

1

#

S

2

a

I

7

#

S

0

#

S

1

#

S2)

When the Output Enable is HIGH, both outputs are in the
high impedance (High Z) state. This feature allows multi­plexer expansion by tying the outputs of up to 128 devices
together. When the outputs of the TRI-STATE devices are
tied together, all but one device must be in the high imped­ance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be de­signed to ensure there is no overlap in the active LOW por­tion of the enable voltages.

Truth Table

Inputs Outputs

OE S

2

S

1

S

0

Z Z

HXXXZZ
L LLLI

0

I

0

LLLHI

1

I

1

L LHLI

2

I

2

LLHHI

3

I

3

LHLLI

4

I

4

L HLHI

5

I

5

LHHLI

6

I

6

L HHHI

7

I

7

H

e

HIGH Voltage Level

L

e

LOW Voltage Level

X

e

Immaterial

Z

e

High Impedance

Logic Diagram

TL/F/9504– 4

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

2

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Storage Temperature

b

65§Ctoa150§C

Ambient Temperature under Bias

b

55§Ctoa125§C

Junction Temperature under Bias

b

55§Ctoa175§C

Plastic

b

55§Ctoa150§C

V

CC

Pin Potential to

Ground Pin

b

0.5V toa7.0V

Input Voltage (Note 2)

b

0.5V toa7.0V

Input Current (Note 2)

b

30 mA toa5.0 mA

Voltage Applied to Output

in HIGH State (with V

CC

e

0V)

Standard Output

b

0.5V to V

CC

TRI-STATE Output

b

0.5V toa5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

OL

(mA)

Note 1: Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired. Functional operation under
these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

Recommended Operating
Conditions

Free Air Ambient Temperature

Military

b

55§Ctoa125§C

Commercial 0

§

Ctoa70§C

Supply Voltage

Military

a

4.5V toa5.5V

Commercial

a

4.5V toa5.5V

DC Electrical Characteristics

Symbol Parameter

54F/74F

Units V

CC

Conditions

Min Typ Max

V

IH

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized as a LOW Signal

V

CD

Input Clamp Diode Voltage

b

1.2 V Min I

IN

eb

18 mA

V

OH

Output HIGH 54F 10% V

CC

2.5 I

OH

eb

1mA

Voltage 54F 10% V

CC

2.4 I

OH

eb

3mA

74F 10% V

CC

2.5
V Min

I

OH

eb

1mA

74F 10% V

CC

2.4 I

OH

eb

3mA

74F 5% V

CC

2.7 I

OH

eb

1mA

74F 5% V

CC

2.7 I

OH

eb

3mA

V

OL

Output LOW 54F 10% V

CC

0.5
V Min

I

OL

e

20 mA

Voltage 74F 10% V

CC

0.5 I

OL

e

24 mA

I

IH

Input HIGH 54F 20.0

mA Max

V

IN

e

2.7V

Current 74F 5.0

I

BVI

Input HIGH Current 54F 100

mA Max

V

IN

e

7.0V

Breakdown Test 74F 7.0

I

CEX

Output HIGH 54F 250

mA Max

V

OUT

e

V

CC

Leakage Current 74F 50

V

ID

Input Leakage

74F 4.75 V 0.0

I

ID

e

1.9 mA

Test All Other Pins Grounded

I

OD

Output Leakage

74F 3.75 mA 0.0

V

IOD

e

150 mV

Circuit Current All Other Pins Grounded

I

IL

Input LOW Current

b

0.6 mA Max V

IN

e

0.5V

I

OZH

Output Leakage Current 50 mA Max V

OUT

e

2.7V

I

OZL

Output Leakage Current

b

50 mA Max V

OUT

e

0.5V

I

OS

Output Short-Circuit Current

b

60

b

150 mA Max V

OUT

e

0V

I

ZZ

Bus Drainage Test 500 mA 0.0V V

OUT

e

5.25V

I

CCL

Power Supply Current 15 22 mA Max V

O

e

LOW

I

CCZ

Power Supply Current 16 24 mA Max V

O

e

HIGH Z

3

AC Electrical Characteristics

74F 54F 74F

T

A

ea

25§C

T

A,VCC

e

Mil TA,V

CC

e

Com

Symbol Parameter V

CC

ea

5.0V
C

L

e

50 pF C

L

e

50 pF

Units

C

L

e

50 pF

Min Typ Max Min Max Min Max

t

PLH

Propagation Delay 3.5 6.0 9.0 3.5 11.5 3.5 9.5

ns

t

PHL

Snto Z 3.2 5.0 7.5 3.2 8.0 3.2 7.5

t

PLH

Propagation Delay 4.5 7.5 10.5 3.5 14.0 4.5 12.5

ns

t

PHL

Snto Z 4.0 6.0 8.5 3.0 10.5 4.0 9.0

t

PLH

Propagation Delay 3.0 5.0 6.5 2.5 8.0 3.0 7.0

ns

t

PHL

Into Z 1.5 2.5 4.0 1.5 6.0 1.5 5.0

t

PLH

Propagation Delay 3.5 5.0 7.0 2.5 9.0 2.5 8.0

ns

t

PHL

Into Z 3.5 5.5 7.0 3.5 9.0 3.5 7.5

t

PZH

Output Enable Time 2.5 4.3 6.0 2.0 7.0 2.5 7.0

t

PZL

OE to Z 2.5 4.3 6.0 2.5 7.5 2.5 6.5

ns

t

PHZ

Output Disable Time 2.5 4.0 5.5 2.5 6.0 2.5 6.0

t

PLZ

OE to Z 1.5 3.0 4.5 1.5 5.0 1.5 4.5

t

PZH

Output Enable Time 3.5 5.0 7.0 3.0 8.5 3.0 7.5

t

PZL

OE to Z 3.5 5.5 7.5 3.5 9.0 3.5 8.0

ns

t

PHZ

Output Disable Time 2.0 3.8 5.5 2.0 5.5 2.0 5.5

t

PLZ

OE to Z 1.5 3.0 4.5 1.5 5.5 1.5 4.5

4

Ordering Information

The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:

74F 251A S C X

Temperature Range Family Special Variations

74F

e

Commercial QBeMilitary grade device with

54F

e

Military environmental and burn-in

processing

Device Type

X

e

Devices shipped in 13×reel

Package Code

Temperature Range

P

e

Plastic DIP

C

e

Commercial (0§Ctoa70§C)

D

e

Ceramic DIP

M

e

Military (b55§Ctoa125§C)

F

e

Flatpak

L

e

Leadless Chip Carrier (LCC)

S

e

Small Outline SOIC JEDEC

SJ

e

Small Outline SOIC EIAJ

Physical Dimensions inches (millimeters)

20-Lead Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

5

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Dual-In-Line Package (D)

NS Package Number J16A

16-Lead (0.150×Wide) Molded Small Outline Package, JEDEC (S)

NS Package Number M16A

6

Physical Dimensions inches (millimeters) (Continued)

16-Lead (0.300×Wide) Molded Small Outline Package, EIAJ (SJ)

NS Package Number M16D

16-Lead (0.300×Wide) Molded Dual-In-Line Package (P)

NS Package Number N16E

7

54F/74F251A 8-Input Multiplexer with TRI-STATE Outputs

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flatpak (F)

NS Package Number W16A

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