54AC151/54ACT151
8-Input Multiplexer
General Description
The ’AC/’ACT151 is a high-speed 8-input digital multiplexer.
It provides, in one package, the ability to select one line of
data from up to eight sources. The ’AC/’ACT151 can be used
as a universal function generator to generate any logic func-
tion of four variables. Both true and complementary outputs
are provided.
Features
nI
CC
reduced by 50%
nOutputs source/sink 24 mA
n’ACT151 has TTL-compatible inputs
nStandard Microcircuit Drawing (SMD)
— ’AC151: 5962-87691
— ’ACT151: 5962-88756
n54AC151 now qualified to 300Krad RHA designation,
refer to the SMD for more information
Logic Symbols
IEEE/IEC
10027001
10027006
Pin Names Description
I
0
–I
7
Data Inputs
S
0
–S
2
Select Inputs
EEnable Input
Z Data Output
ZInverted Data Output
FACT®is a registered trademark of Fairchild Semiconductor Corporation.
July 2003
54AC151/54ACT151 8-Input Multiplexer
© 2003 National Semiconductor Corporation DS100270 www.national.com
Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
10027002
10027003
Truth Table
Inputs Outputs
ES
2
S
1
S
0
Z Z
HXXXHL
LLLLI
0
I
0
LL L H I
1
I
1
LL H L I
2
I
2
LL H H I
3
I
3
LH L L I
4
I
4
LH L H I
5
I
5
LH H L I
6
I
6
LHHHI
7
I
7
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The ’AC/’ACT151 is a logic implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S
0
,S
1
,S
2
. Both true and
complementary outputs are provided. The Enable input (E) is
active LOW. When it is not activated, the complementary
output is HIGH and the true output is LOW regardless of all
other inputs. The logic function provided at the output is:
Z=E•(I
0
•S
0
•S
1
•S
2
+I
1
•S
0
•S
1
•S
2
+
I
2
•S
0
•S
1
•S
2
+I
3
•S
0
•S
1
•S
2
+I
4
•S
0
•S
1
•S
2
+
I
5
•S
0
•S
1
•S
2
+I
6
•S
0
•S
1
•S
2
+I
7
•S
0
•S
1
•S
2
)
The ’AC/’ACT151 provides the ability, in one package to
select from eight sources of data or control information. By
proper manipulation of the inputs, the ’AC/’ACT151 can
provide any logic function of four variables and its comple-
ment.
54AC151/54ACT151
www.national.com 2
Logic Diagram
10027004
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
54AC151/54ACT151
www.national.com3
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
= −55˚C to +125˚C Units Conditions
(V) 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
=50µA
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
=12mA
4.5 0.50 V I
OL
=24mA
5.5 0.50 I
OL
=24mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
54AC151/54ACT151
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DC Characteristics for ’AC Family Devices (Continued)
54AC
Symbol Parameter V
CC
T
A
= −55˚C to +125˚C Units Conditions
(V) Guaranteed Limits
I
OLD
Minimum Dynamic
Output Current (Note 3)
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
= −55˚C to +125˚C Units Conditions
(V) 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
=50µA
Output Voltage 5.5 0.1
(Note 5)
V
IN
=V
IL
or V
IH
4.5 0.50 V I
OL
=24mA
5.5 0.50 I
OL
=24mA
I
IN
Maximum Input 5.5 ±1.0 µA V
I
=V
CC
, GND
Leakage Current
I
CCT
Maximum 5.5 1.6 mA V
I
=V
CC
− 2.1V
I
CC
/Input
I
OLD
Minimum Dynamic 5.5 50 mA V
OLD
= 1.65V Max
I
OHD
Output Current (Note 6) 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.
54AC151/54ACT151
www.national.com5
AC Electrical Characteristics
Symbol Parameter
54AC
Units
V
CC
T
A
= −55˚C to +125˚C Fig.
(V) C
L
= 50 pF No.
(Note 8) Min Max
t
PLH
Propagation Delay 3.3 1.0 22.0 ns
S
n
toZorZ 5.0 1.0 15.5
t
PHL
Propagation Delay 3.3 1.0 22.0 ns
S
n
toZorZ 5.0 1.0 15.5
t
PLH
Propagation Delay 3.3 1.0 15.5 ns
EtoZorZ 5.0 1.0 12.0
t
PHL
Propagation Delay 3.3 1.0 15.5 ns
EtoZorZ 5.0 1.0 12.0
t
PLH
Propagation Delay 3.3 1.0 16.0 ns
I
n
toZorZ 5.0 1.0 12.0
t
PHL
Propagation Delay 3.3 1.0 18.0 ns
I
n
toZorZ 5.0 1.0 13.0
Note 8: Voltage Range 3.3 is 3.3V ±0.3V
Voltage Range 5.0 is 5.0V ±0.5V
AC Electrical Characteristics
Symbol Parameter
54ACT
Units
V
CC
T
A
= −55˚C to +125˚C Fig.
(V) C
L
= 50 pF No.
(Note 9) Min Max
t
PLH
Propagation Delay 5.0 1.0 19.5 ns
S
n
to Z
t
PHL
Propagation Delay 5.0 1.0 20.0 ns
S
n
to Z
t
PLH
Propagation Delay 5.0 1.0 19.5 ns
S
n
to Z
t
PHL
Propagation Delay 5.0 1.0 20.0 ns
S
n
to Z
t
PLH
Propagation Delay 5.0 1.0 12.0 ns
EtoZ
t
PHL
Propagation Delay 5.0 1.0 12.5 ns
EtoZ
t
PLH
Propagation Delay 5.0 1.0 12.0 ns
EtoZ
t
PHL
Propagation Delay 5.0 1.0 12.5 ns
EtoZ
t
PLH
Propagation Delay 5.0 1.0 15.0 ns
I
n
to Z
t
PHL
Propagation Delay 5.0 1.0 16.0 ns
I
n
to Z
t
PLH
Propagation Delay 5.0 1.0 15.0 ns
I
n
to Z
t
PHL
Propagation Delay 5.0 1.0 16.0 ns
I
n
to Z
Note 9: Voltage Range 5.0 is 5.0V ±0.5V
54AC151/54ACT151
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Capacitance
Symbol Parameter Typ Units Conditions
C
IN
Input Capacitance 4.5 pF V
CC
= OPEN
C
PD
Power Dissipation 70.0 pF V
CC
= 5.0V
Capacitance
54AC151/54ACT151
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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
54AC151/54ACT151
www.national.com 8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16 Lead Ceramic Flatpak (F)
NS Package Number W16A
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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
safety or effectiveness.
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54AC151/54ACT151 8-Input Multiplexer
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.
