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

November 1994

54F/74F138
1-of-8 Decoder/Demultiplexer
General Description Features
The ’F138 is a high-speed 1-of-8 decoder/demultiplexer. Y Demultiplexing capability
This device is ideally suited for high-speed bipolar memory Y Multiple input enable for easy expansion
chip select address decoding. The multiple input enables Y Active LOW mutually exclusive outputs
allow parallel expansion to a 1-of-24 decoder using just Y Guaranteed 4000V minimum ESD protection
three ’F138 devices or a 1-of-32 decoder using four ’F138
devices and one inverter.

Package
Commercial Military 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 suffix e SCX and SJX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB.

Logic Symbols Connection Diagrams

Pin Assignment for DIP, Pin Assignment

SOIC and Flatpak for LCC

TL/F/9478–3

IEEE/IEC
TL/F/9478 – 1
TL/F/9478 – 2

TL/F/9478–6

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation TL/F/9478 RRD-B30M75/Printed in U. S. A.

Unit Loading/Fan Out
54F/74F
Pin Names Description U.L. Input IIH/IIL
HIGH/LOW Output IOH/IOL
A0 – A2 Address Inputs 1.0/1.0 20 mA/b0.6 mA
E1, E2 Enable Inputs (Active LOW) 1.0/1.0 20 mA/b0.6 mA
E3 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 ac- of the device to a 1-of-32 (5 lines to 32 lines) decoder with
cepts three binary weighted inputs (A0, A1, A2) and, when just four ’F138 devices and one inverter (See Figure 1 ). The
enabled, provides eight mutually exclusive active LOW out- ’F138 can be used as an 8-output demultiplexer by using
puts (O0 – O7). The ’F138 features three Enable inputs, two one of the active LOW Enable inputs as the data input and
active LOW (E1, E2) and one active HIGH (E3). All outputs the other Enable inputs as strobes. The Enable inputs which
will be HIGH unless E1 and E2 are LOW and E3 is HIGH. are not used must be permanently tied to their appropriate
This multiple enable function allows easy parallel expansion active HIGH or active LOW state.

Truth Table
Inputs Outputs
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7
H X X X X X H H H H H H H H
X H X X X X H H H H H H H H
X X L X X X H H H H H H H H
L L H L L L L H H H H H H H
L L H H L L H L H H H H H H
L L H L H L H H L H H H H H
L L H H H L H H H L H H H H
L L H L L H H H H H L H H H
L L H H L H H H H H H L H H
L L H L H H H H H H H H L H
L L H H H H H H H H H H H L
H e HIGH 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) Recommended Operating
If Military/Aerospace specified devices are required, Conditions
please contact the National Semiconductor Sales
Free Air Ambient Temperature
Office/Distributors for availability and specifications.
Military b 55§ C to a 125§ C
Storage Temperature b 65§ C to a 150§ C Commercial 0§ C to a 70§ C
Ambient Temperature under Bias b 55§ C to a 125§ C Supply Voltage
Junction Temperature under Bias b 55§ C to a 175§ C Military a 4.5V to a 5.5V
Plastic b 55§ C to a 150§ C Commercial a 4.5V to a 5.5V
VCC Pin Potential to
Ground Pin b 0.5V to a 7.0V
Input Voltage (Note 2) b 0.5V to a 7.0V
Input Current (Note 2) b 30 mA to a 5.0 mA
Voltage Applied to Output
in HIGH State (with VCC e 0V)
Standard Output b 0.5V to VCC
TRI-STATEÉ Output b 0.5V to a 5.5V
Current Applied to Output
in LOW State (Max) twice the rated IOL (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.

DC Electrical Characteristics
54F/74F
Symbol Parameter Units VCC Conditions
Min Typ Max
VIH Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
VIL Input LOW Voltage 0.8 V Recognized as a LOW Signal
VCD Input Clamp Diode Voltage b 1.2 V Min IIN e b18 mA
VOH Output HIGH 54F 10% VCC 2.5 IOH e b1 mA
Voltage 74F 10% VCC 2.5 V Min IOH e b1 mA
74F 5% VCC 2.7 IOH e b1 mA
VOL Output LOW 54F 10% VCC 0.5 IOL e 20 mA
V Min
Voltage 74F 10% VCC 0.5 IOL e 20 mA
IIH Input HIGH 54F 20.0 VIN e 2.7V
mA Max
Current 74F 5.0
IBVI Input HIGH Current 54F 100 VIN e 7.0V
mA Max
Breakdown Test 74F 7.0
ICEX Output HIGH 54F 250 VOUT e VCC
mA Max
Leakage Current 74F 50
VID Input Leakage IID e 1.9 mA
74F 4.75 V 0.0
Test All Other Pins Grounded
IOD Output Leakage VIOD e 150 mV
74F 3.75 mA 0.0
Circuit Current All Other Pins Grounded
IIL Input LOW Current b 0.6 mA Max VIN e 0.5V
IOS Output Short-Circuit Current b 60 b 150 mA Max VOUT e 0V
ICCH Power Supply Current 13 20 mA Max VO e HIGH
ICCL Power Supply Current 13 20 mA Max VO e LOW

4
AC Electrical Characteristics
74F 54F 74F
TA e a 25§ C
TA, VCC e Mil TA, VCC e Com Fig.
Symbol Parameter VCC e a 5.0V Units
CL e 50 pF CL e 50 pF No.
CL e 50 pF
Min Typ Max Min Max Min Max
tPLH Propagation Delay 3.5 5.6 7.5 3.0 12.0 3.5 8.5
ns F –3
tPHL An to On 4.0 6.1 8.0 4.0 9.5 4.0 9.0
tPLH Propagation Delay 3.5 5.4 7.0 3.0 11.0 3.5 8.0
ns F –4
tPHL E1 or E2 to On 3.0 5.3 7.0 3.0 8.0 3.0 7.5
tPLH Propagation Delay 4.0 6.2 8.0 3.5 12.5 4.0 9.0
ns F –4
tPHL E3 to On 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 QB e Military 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§ C to a 70§ C)
D e Ceramic DIP M e Military (b55§ C to a 125§ 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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