54AC139,54ACT139
54AC139 54ACT139 Dual 1-of-4 Decoder/Demultiplexer
Literature Number: SNOS086
54AC139 •54ACT139
Dual 1-of-4 Decoder/Demultiplexer
General Description
The ’AC/’ACT139 is a high-speed, dual 1-of-4 decoder/
demultiplexer. The device has two independent decoders,
each accepting two inputs and providing four
mutually-exclusive active-LOW outputs. Each decoder has
an active-LOW Enable input which can be used as a data in-
put for a 4-output demultiplexer. Each half of the ’AC/
’ACT139 can be used as a function generator providing all
four minterms of two variables.
Features
nI
CC
reduced by 50%
nMultifunction capability
nTwo completely independent 1-of-4 decoders
nActive LOW mutually exclusive outputs
nOutputs source/sink 24 mA
n’ACT139 has TTL-compatible inputs
nStandard Military Drawing (SMD)
—’AC139: 5962-87623
—’ACT139: 5962-87553
Logic Symbols
Pin Names Description
A
0
,A
1
Address Inputs
EEnable Inputs
O
0
–O
3
Outputs
FACT®is a registered trademark of Fairchild Semiconductor Corporation.
DS100269-8
DS100269-1
IEEE/IEC
DS100269-2
August 1998
54AC139
•
54ACT139 Dual 1-of-4 Decoder/Demultiplexer
© 1998 National Semiconductor Corporation DS100269 www.national.com
Connection Diagrams
Functional Description
The ’AC/’ACT139 is a high-speed dual 1-of-4 decoder/
demultiplexer. The device has two independent decoders,
each of which accepts two binary weighted inputs (A
0
–A
1
)
and provides four mutually exclusive active-LOW outputs
(O
0
–O
3
). Each decoder has an active-LOW enable (E).
When E is HIGH all outputs are forced HIGH. The enable
can be used as the data input for a 4-output demultiplexer
application. Each half of the ’AC/’ACT139 generates all four
minterms of two variables. These four minterms are useful in
some applications, replacing multiple gate functions as
shown in , and thereby reducing the number of packages re-
quired in a logic network.
Truth Table
Inputs Outputs
EA
0
A
1
O
0
O
1
O
2
O
3
HXXHHHH
LLLLHHH
LHLHLHH
LLHHHLH
LHHHHHL
H
=
HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial
Pin Assignment
for DIP and Flatpak
DS100269-3
Pin Assignment
for LCC
DS100269-4
DS100269-6
FIGURE 1. Gate Functions (Each Half)
www.national.com 2
Logic Diagram
DS100269-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=−0.5V −20 mA
V
I
=V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
=−0.5V −20 mA
V
O
=V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to V
CC
+ 0.5V
DC Output Source
or Sink Current (I
O
)±50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)±50 mA
Storage Temperature (T
STG
) −65˚C to +150˚C
Junction Temperature (T
J
)
CDIP 175˚C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC 2.0V to 6.0V
’ACT 4.5V to 5.5V
Input Voltage (V
I
) 0VtoV
CC
Output Voltage (V
O
) 0VtoV
CC
Operating Temperature (T
A
)
54AC/ACT −55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30%to 70%of V
CC
V
CC
@3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@4.5V, 5.5V 125 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 recom-
mend operation of FACT®circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
54AC
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to
+125˚C
Guaranteed
Limits
V
IH
Minimum High Level 3.0 2.1 V
OUT
=0.1V
Input Voltage 4.5 3.15 V or V
CC
− 0.1V
5.5 3.85
V
IL
Maximum Low Level 3.0 0.9 V
OUT
=0.1V
Input Voltage 4.5 1.35 V or V
CC
− 0.1V
5.5 1.65
V
OH
Minimum High Level 3.0 2.9 I
OUT
=−50 µA
Output Voltage 4.5 4.4 V
5.5 5.4 (Note 2)
V
IN
=V
IL
or V
IH
3.0 2.4 I
OH
=−12 mA
4.5 3.7 V I
OH
=−24 mA
5.5 4.7 I
OH
=−24 mA
V
OL
Maximum Low Level 3.0 0.1 I
OUT
=50 µA
Output Voltage 4.5 0.1 V
5.5 0.1 (Note 2)
V
IN
=V
IL
or V
IH
3.0 0.50 I
OL
=12 mA
4.5 0.50 V I
OL
=24 mA
5.5 0.50 I
OL
=24 mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
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DC Characteristics for ’AC Family Devices (Continued)
54AC
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to
+125˚C
Guaranteed
Limits
(Note 3)
Minimum Dynamic
Output Current
I
OLD
5.5 50 mA V
OLD
=1.65V Max
I
OHD
5.5 −50 mA V
OHD
=3.85V Min
I
CC
Maximum Quiescent 5.5 80.0 µA V
IN
=V
CC
Supply Current or GND
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.
Note 4: IIN and ICC @3.0V are guaranteed to be less than or equal to the respective limit @5.5V VCC.
ICC for 54AC @25˚C is identical to 74AC @25˚C.
DC Characteristics for ’ACT Family Devices
54ACT
Symbol Parameter V
CC
T
A
=Units Conditions
(V) −55˚C to
+125˚C
Guaranteed
Limits
V
IH
Minimum High Level 4.5 2.0 V V
OUT
=0.1V
Input Voltage 5.5 2.0 or V
CC
− 0.1V
V
IL
Maximum Low Level 4.5 0.8 V V
OUT
=0.1V
Input Voltage 5.5 0.8 or V
CC
− 0.1V
V
OH
Minimum High Level 4.5 4.4 V I
OUT
=−50 µA
Output Voltage 5.5 5.4 (Note 5)
V
IN
=V
IL
or V
IH
4.5 3.70 V I
OH
=−24 mA
5.5 4.70 I
OH
=−24 mA
V
OL
Maximum Low Level 4.5 0.1 V I
OUT
=50 µA
Output Voltage 5.5 0.1 (Note 5)
V
IN
=V
IL
or V
IH
4.5 0.50 V I
OL
=24 mA
5.5 0.50 I
OL
=24 mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
I
CCT
Maximum I
CC
/Input 5.5 1.6 mA V
I
=V
CC
− 2.1V
(Note 6)
I
OLD
Minimum Dynamic 5.5 50 mA V
OLD
=1.65V Max
I
OHD
Output Current 5.5 −50 mA V
OHD
=3.85V Min
I
CC
Maximum Quiescent 5.5 80.0 µA V
IN
=V
CC
Supply Current or GND
Note 5: All outputs loaded; thresholds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
Note 7: ICC for 54ACT @25˚C is identical to 74ACT @25˚C.
5 www.national.com
AC Electrical Characteristics
54AC
V
CC
T
A
=−55˚C Fig.
Symbol Parameter (V) to +125˚C Units No.
(Note 8) C
L
=50 pF
Min Max
t
PLH
Propagation Delay 3.3 1.0 14.5 ns
A
n
to O
n
5.0 1.0 11.0
t
PHL
Propagation Delay 3.3 1.0 12.5 ns
A
n
to O
n
5.0 1.0 10.0
t
PLH
Propagation Delay 3.3 1.0 14.5 ns
E
n
to O
n
5.0 1.0 11.0
t
PHL
Propagation Delay 3.3 1.0 12.5 ns
E
n
to O
n
5.0 1.0 10.0
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
AC Electrical Characteristics
54ACT
V
CC
T
A
=−55˚C Fig.
Symbol Parameter (V) to +125˚C Units No.
(Note 9) 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 11.0 ns
A
n
to O
n
t
PLH
Propagation Delay 5.0 1.0 12.5 ns
E
n
to O
n
t
PHL
Propagation Delay 5.0 1.0 12.0 ns
E
n
to O
n
Note 9: 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 40.0 pF V
CC
=5.0V
Capacitance
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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
7 www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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16 Lead Ceramic Flatpak (F)
NS Package Number W16A
54AC139
•
54ACT139 Dual 1-of-4 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.
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