Datasheet 5962-8765401FA, 5962-8765401EA, 5962-87654012A, 54FCT138MW8, 54FCT138DM Datasheet (NSC)

54FCT138
1-of-8 Decoder/Demultiplexer

General Description

The FCT138 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
FCT138 devicesora 1-of-32 decoder using four FCT138 de­vices and one inverter.

Features

n Demultiplexing capability
n Multiple input enable for easy expansion
n Active LOW mutually exclusive outputs
n Outputs sink capability of 32mA, source capability of

12mA

n TTL input and output level compatible
n CMOS power consumption
n Standard Microcircuit Drawing (SMD) 5962-8765401

Ordering Code

Military Package Package Description

Number

54FCT138DMQB J16A 16-Lead Ceramic Dual-In-Line
54FCT138FMQB W16A 16-Lead Cerpack
54FCT138LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C

Logic Symbols

Pin Names Description

A

0–A2

Address Inputs

E

1–E2

Enable Inputs

E

3

Enable Input

O

0–O7

Outputs

Connection Diagrams

FACT®is a registered trademark of Fairchild Semiconductor Corporation.

DS100963-1

IEEE/IEC

DS100963-7

Pin Assignment

for DIP and Flatpak

DS100963-2

Pin Assignment

for LCC

DS100963-3

October 1999

54FCT138 1-of-8 Decoder/Demultiplexer

© 1999 National Semiconductor Corporation DS100963 www.national.com

Functional Description

The FCT138 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 FCT138 features three Enable inputs,
two active-LOW (E1,E2) and one active-HIGH (E3). All out­puts will be HIGH unless E1and E2are LOW and E3is
HIGH. This multiple enable function allows easy parallel ex-

pansion of the device to a 1-of-32 (5 lines to 32 lines) de­coder with just four FCT138 devices and one inverter (see

Figure 1

). The FCT138 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.

Inputs Outputs

E

1E2E3A0A1A2O0O1O2O3O4O5O6O7

HXXXXXHHHHHHHH
XHXXXXHHHHHHHH
XXLXXXHHHHHHHH

LLHLLLLHHHHHHH
LLHHLLHLHHHHHH
LLHLHLHHLHHHHH
LLHHHLHHHLHHHH

LLHLLHHHHHLHHH
LLHHLHHHHHHLHH
LLHLHHHHHHHHLH
LLHHHHHHHHHHHL

H=HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial

Logic Diagram

DS100963-4

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

54FCT138

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Logic Diagram (Continued)

DS100963-5

FIGURE 1. Expansion to 1-of-32 Decoding

54FCT138

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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 −65˚C to +150˚C
Ambient Temperature under Bias −55˚C to +125˚C
Junction Temperature under Bias

Ceramic −55˚C to +175˚C

V

CC

Pin Potential to

Ground Pin −0.5V to +7.0V
Input Voltage (Note 1) −0.5V to +7.0V
Input Current (Note 1) −30 mA to +5.0 mA
Voltage Applied to Any Output

in the Disabled or

Power-Off State −0.5V to +5.5V

in the HIGH State −0.5V to V

CC

Current Applied to Output

in LOW State (Max) Twice the rated I

OL

(mA)

DC Latchup Source Current −500 mA

Recommended Operating
Conditions

Free Air Ambient Temperature

Military −55˚C to +125˚C

Supply Voltage

Military +4.5V to +5.5V

Minimum Input Edge Rate (∆V/∆t)

Data Input 50 mV/ns
Enable Input 20 mV/ns

Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom­mend operation of FACT

®

circuits outside databook specifications.

DC Characteristics for ’FCT Family Devices

Symbol Parameter FCT138 Units V

CC

Conditions

Min Max

V

IH

Input HIGH Voltage 2.0 V Recognized HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized LOW Signal

V

CD

Input Clamp Diode Voltage −1.2 V Min I

IN

=

−18 mA

V

OH

Output HIGH
Voltage

54FCT 4.3

V Min

I

OH

=

−300 µA

54FCT 2.4 I

OH

=

−12 mA

V

OL

Output LOW
Voltage

54FCT 0.2 V Min I

OL

=

300 µA

54FCT 0.5 I

OL

=

32 mA

I

IH

Input HIGH Current 5 µA Max V

IN

=

V

CC

I

IL

Input LOW Current −5 µA Max V

IN

=

0.0V

I

OS

Output Short-Circuit Current -60 mA Max V

OUT

=

0.0V

I

CCQ

Quiescent Power Supply Current 1.5 mA Max V

IN

<

0.2V or VIN5.3V, VCC=

5.5V

∆I

CC

Quiescent Power
Supply Current

2.0 mA Max V

I

=

3.4V, V

CC

= 5.5V

I

CCD

Dynamic I

CC

0.4 mA/
MHz

Max Outputs Open, VCC= 5.5V, V

IN

5.3V or V

IN

<

0.2V, One Bit

Toggling, 50%Duty Cycle, OE

=

GND, LE=V

CC

I

CCT

Total Power Supply
Current

5.5 mA Max Outputs Open, fCP= 10 MHz,

V

CC

= 5.5V, VIN5.3V or V

IN

<

0.2V, One Bit Toggling, 50

%

Duty Cycle, OE=GND, LE

=

V

CC

Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.

54FCT138

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AC Electrical Characteristics

54FCT

V

CC

T

A

=

−55˚C Fig.

Symbol Parameter (V) to +125˚C Units No.

(Note 4) C

L

=

50 pF

Min Max

t

PLH

Propagation Delay 5.0 1.0 12.0 ns
A

n

to O

n

t

PHL

Propagation Delay 5.0 1.0 12.0 ns
A

n

to O

n

t

PLH

Propagation Delay 5.0 1.0 12.5 ns
E

1

or E2to O

n

t

PHL

Propagation Delay 5.0 1.0 12.5 ns
E

1

or E2to O

n

t

PLH

Propagation Delay 5.0 1.0 12.5 ns
E

3

toOn

t

PHL

Propagation Delay 5.0 1.0 12.5 ns
E

3

toOn

Note 4: Voltage Range 5.0 is 5.0V±0.5V

Capacitance

Symbol Parameter Typ Units Conditions

C

IN

Input Capacitance 4.5 pF V

CC

=

OPEN

C

PD

Power Dissipation 60.0 pF V

CC

=

5.0V

Capacitance

54FCT138

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Physical Dimensions inches (millimeters) unless otherwise noted

20 Terminal Ceramic Leadless Chip Carrier (L)

NS Package Number E20A

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

NS Package Number J16A

54FCT138

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
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16 Lead Ceramic Flatpak (F)

NS Package Number W16A

54FCT138 1-of-8 Decoder/Demultiplexer

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.