Datasheet 54F138, 74F138 Datasheet (Fairchild)

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

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

November 1994

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.

Commercial Military

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

Package

Number

Logic Symbols

Pin Assignment for DIP,

SOIC and Flatpak

Features

Y

Demultiplexing capability

Y

Multiple input enable for easy expansion

Y

Active LOW mutually exclusive outputs

Y

Guaranteed 4000V minimum ESD protection

Package Description

e

DMQB, FMQB and LMQB.

Connection Diagrams

Pin Assignment

for LCC

TL/F/9478– 3

IEEE/IEC

TL/F/9478– 6

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C

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

TL/F/9478

TL/F/9478– 1

TL/F/9478– 2

Unit Loading/Fan Out

54F/74F

Pin Names Description

A0–A
E

1,E2

E

3

O0–O

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

2

Enable Inputs (Active LOW) 1.0/1.0 20 mA/b0.6 mA
Enable Input (Active HIGH) 1.0/1.0 20 mA/b0.6 mA
Outputs (Active LOW) 50/33.3

7

U.L. Input I

HIGH/LOW Output IOH/I

IH/IIL

b

1 mA/20 mA

OL

Functional Description

The ’F138 high-speed 1-of-8 decoder/demultiplexer ac­cepts three binary weighted inputs (A
enabled, provides eight mutually exclusive active LOW out­puts (O
active LOW (E
will be HIGH unless E
This multiple enable function allows easy parallel expansion

). The ’F138 features three Enable inputs, two

0–O7

) and one active HIGH (E3). All outputs

1,E2

and E2are LOW and E3is HIGH.

1

0,A1,A2

) and, when

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

E1E2E3A0A

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

e

L

LOW Voltage Level

e

X

Immaterial

A2O0O1O

1

O3O4O5O6O

2

Figure 1

). The

7

2

Logic Diagram

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

TL/F/9478– 4

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

Ambient Temperature under Bias

Junction Temperature under Bias

Plastic

Pin Potential to

V

CC

Ground Pin

Input Voltage (Note 2)

Input Current (Note 2)

Voltage Applied to Output

in HIGH State (with V
Standard Output

CC

e

TRI-STATEÉOutput

0V)

b

65§Ctoa150§C

b

55§Ctoa125§C

b

55§Ctoa175§C

b

55§Ctoa150§C

b

0.5V toa7.0V

b

0.5V toa7.0V

b

30 mA toa5.0 mA

b

0.5V to V

b

0.5V toa5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

(mA)

OL

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.

DC Electrical Characteristics

Symbol Parameter

V

V

V

V

V

I

IH

I

BVI

I

CEX

V

I

OD

I

IL

I

OS

I

CCH

I

CCL

IH

IL

CD

OH

OL

ID

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

Input LOW Voltage 0.8 V Recognized as a LOW Signal

Input Clamp Diode Voltage

Output HIGH 54F 10% V
Voltage 74F 10% V

Output LOW 54F 10% V
Voltage 74F 10% V

Input HIGH 54F 20.0
Current 74F 5.0

Input HIGH Current 54F 100
Breakdown Test 74F 7.0

Output HIGH 54F 250
Leakage Current 74F 50

Input Leakage
Test All Other Pins Grounded

Output Leakage
Circuit Current All Other Pins Grounded

Input LOW Current

Output Short-Circuit Current

Power Supply Current 13 20 mA Max V

Power Supply Current 13 20 mA Max V

74F 5% V

74F 4.75 V 0.0

74F 3.75 mA 0.0

Min Typ Max

2.5 I

CC

2.5 V Min I

CC

2.7 I

CC

CC

CC

b

60

CC

54F/74F

Recommended Operating
Conditions

Free Air Ambient Temperature

Military
Commercial 0

Supply Voltage

Military
Commercial

Units V

b

1.2 V Min I

0.5

0.5 I

CC

V Min

mA Max

mA Max

mA Max

b

0.6 mA Max V

b

150 mA Max V

I

V

V

V

I

V

IN

OH

OH

OH

OL

OL

ID

IN

IN

OUT

IOD

IN

OUT

O

O

eb

eb

eb

eb

e

e

e

e

e

e

1.9 mA

e

e

e

e

e

20 mA
20 mA

HIGH

LOW

Conditions

18 mA

1mA
1mA
1mA

2.7V

7.0V

V

150 mV

0.5V

0V

b

55§Ctoa125§C

Ctoa70§C

§

a

4.5V toa5.5V

a

4.5V toa5.5V

CC

4

AC Electrical Characteristics

Symbol Parameter V

t
t

t
t

t
t

PLH

PHL

PLH

PHL

PLH

PHL

Propagation Delay 3.5 5.6 7.5 3.0 12.0 3.5 8.5
Anto O

n

Propagation Delay 3.5 5.4 7.0 3.0 11.0 3.5 8.0
E1or E2to O

n

Propagation Delay 4.0 6.2 8.0 3.5 12.5 4.0 9.0
E3to O

n

T

CC

C

Min Typ Max Min Max Min Max

4.0 6.1 8.0 4.0 9.5 4.0 9.0

3.0 5.3 7.0 3.0 8.0 3.0 7.5

3.5 5.6 7.5 3.5 8.5 3.5 8.5

74F 54F 74F

ea

25§C

A

L

ea

e

50 pF

5.0V

T

A,VCC

e

C

50 pF C

L

e

Mil TA,V

e

Com Fig.

CC

e

50 pF

L

Units

ns

ns

ns

No.

F–3

F–4

F–4

FIGURE 1. Expansion to 1-of-32 Decoding

TL/F/9478– 5

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

e

74F

Commercial QBeMilitary grade device with

e

54F

Military environmental and burn-in

Device Type

Package Code

e

Plastic DIP

P

e

Ceramic DIP

D

e

Flatpak

F

e

L

Leadless Chip Carrier (LCC)

e

S

Small Outline SOIC JEDEC

e

SJ

Small Outline SOIC EIAJ

5

processing

e

Devices shipped in 13×reel

X

Temperature Range

e

Commercial (0§Ctoa70§C)

C

e

Military (b55§Ctoa125§C)

M

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)

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

NS Package Number M16D

NS Package Number N16E

9

Physical Dimensions inches (millimeters) (Continued)

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

16-Lead Ceramic Flatpak (F)

NS Package Number W16A

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systems which, (a) are intended for surgical implant support device or system whose failure to perform can
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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