Datasheet 54F138LMQB, 54F138FMQB, 54F138DMQB Datasheet (NSC)

TL/F/9478

54F/74F138 1-of-8 Decoder/Demultiplexer

November 1994

54F/74F138
1-of-8 Decoder/Demultiplexer

General Description

The ’F138 is a high-speed 1-of-8 decoder/demultiplexer.
This device is ideally suited for high-speed bipolar memory
chip select address decoding. The multiple input enables
allow parallel expansion to a 1-of-24 decoder using just
three ’F138 devices or a 1-of-32 decoder using four ’F138
devices and one inverter.

Features

Y

Demultiplexing capability

Y

Multiple input enable for easy expansion

Y

Active LOW mutually exclusive outputs

Y

Guaranteed 4000V minimum ESD protection

Commercial Military

Package

Package Description

Number

74F138PC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line

54F138DM (Note 2) J16A 16-Lead Ceramic Dual-In-Line

74F138SC (Note 1) M16A 16-Lead (0.150×Wide) Molded Small Outline, JEDEC

74F138SJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ

54F138FM (Note 2) W16A 16-Lead Cerpack

54F138LM (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

TL/F/9478– 3

IEEE/IEC

TL/F/9478– 6

Connection Diagrams

Pin Assignment for DIP,

SOIC and Flatpak

TL/F/9478– 1

Pin Assignment

for LCC

TL/F/9478– 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

A0–A

2

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

E

1,E2

Enable Inputs (Active LOW) 1.0/1.0 20 mA/b0.6 mA

E

3

Enable Input (Active HIGH) 1.0/1.0 20 mA/b0.6 mA

O0–O

7

Outputs (Active LOW) 50/33.3

b

1 mA/20 mA

Functional Description

The ’F138 high-speed 1-of-8 decoder/demultiplexer ac­cepts three binary weighted inputs (A

0,A1,A2

) and, when
enabled, provides eight mutually exclusive active LOW out­puts (O

0–O7

). The ’F138 features three Enable inputs, two

active LOW (E

1,E2

) and one active HIGH (E3). All outputs

will be HIGH unless E

1

and E2are LOW and E3is HIGH.

This multiple enable function allows easy parallel expansion

of the device to a 1-of-32 (5 lines to 32 lines) decoder with
just four ’F138 devices and one inverter (See

Figure 1

). The
’F138 can be used as an 8-output demultiplexer by using
one of the active LOW Enable inputs as the data input and
the other Enable inputs as strobes. The Enable inputs which
are not used must be permanently tied to their appropriate
active HIGH or active LOW state.

Truth Table

Inputs Outputs

E1E2E3A0A1A2O0O1O

2

O3O4O5O6O

7

HXXXXXHH H HHHHH
XHXXXXHH H HHHHH
XXLXXXHH H HHHHH

LLHLLL L H HHHHHH
LLHHLLHL H HHHHH
LLHLHLHH L HHHHH
LLHHHLHH H LHHHH

LLHLLHHHH H LHHH
LLHHLHHHHHHLHH
LLHLHHHHH HHH LH
LLHHHHHHH HHHHL

HeHIGH Voltage Level

L

e

LOW Voltage Level

X

e

Immaterial

2

Logic Diagram

TL/F/9478– 4

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

3

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-STATEÉOutput

b

0.5V toa5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

OL

(mA)

ESD Last Passing Voltage (Min) 4000V

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 74F 10% V

CC

2.5 V Min I

OH

eb

1mA

74F 5% V

CC

2.7 I

OH

eb

1mA

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

20 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

OS

Output Short-Circuit Current

b

60

b

150 mA Max V

OUT

e

0V

I

CCH

Power Supply Current 13 20 mA Max V

O

e

HIGH

I

CCL

Power Supply Current 13 20 mA Max V

O

e

LOW

4

AC Electrical Characteristics

74F 54F 74F

T

A

ea

25§C

T

A,VCC

e

Mil TA,V

CC

e

Com Fig.

Symbol Parameter V

CC

ea

5.0V
C

L

e

50 pF C

L

e

50 pF

Units

No.

C

L

e

50 pF

Min Typ Max Min Max Min Max

t

PLH

Propagation Delay 3.5 5.6 7.5 3.0 12.0 3.5 8.5

ns

F–3

t

PHL

Anto O

n

4.0 6.1 8.0 4.0 9.5 4.0 9.0

t

PLH

Propagation Delay 3.5 5.4 7.0 3.0 11.0 3.5 8.0

ns

F–4

t

PHL

E1or E2to O

n

3.0 5.3 7.0 3.0 8.0 3.0 7.5

t

PLH

Propagation Delay 4.0 6.2 8.0 3.5 12.5 4.0 9.0

ns

F–4

t

PHL

E3to O

n

3.5 5.6 7.5 3.5 8.5 3.5 8.5

TL/F/9478– 5

FIGURE 1. Expansion to 1-of-32 Decoding

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 138 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

5

6

Physical Dimensions inches (millimeters)

20-Lead Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

7

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

8

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

9

54F/74F138 1-of-8 Decoder/Demultiplexer

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flatpak (F)

NS Package Number W16A

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into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

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