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August 1998
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
n ICC reduced by 50%
n Outputs source/sink 24 mA
n ’ACT151 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC151: 5962-87691
— ’ACT151: 5962-88756
Ordering Code:
Logic Symbols
IEEE/IEC
DS100270-1
Pin
Names
I0– I7
S0– S2
E
Z
Z
Description
Data Inputs
Select Inputs
Enable Input
Data Output
Inverted Data Output
DS100270-6
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100270
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Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
Truth Table
Inputs
E S2 S1
HX
X
LL
L
LL
L
LL
H
LL
H
LH
L
LH
L
LH
H
LH
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
DS100270-2
Outputs
S0 Z
XH
Z
L
L I0 I0
H I1 I1
L I2 I2
H I3 I3
L I4 I4
H I5 I5
L I6 I6
H I7 I7
DS100270-3
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, S0, S1, S2. 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 (I0 S0 S1 S2 + I1 S0 S1 S2 +
I2 S0 S1 S2 + I3 S0 S1 S2 + I4 S0 S1 S2 +
I5 S0 S1 S2 + I6 S0 S1 S2 + I7 S0 S1 S2)
The ’AC/’ACT151 provides the ability, in one package to se-
lect from eight sources of data or control information. By
proper manipulation of the inputs, the ’AC/’ACT151 can pro-
vide any logic function of four variables and its complement.
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Logic Diagram
DS100270-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Absolute Maximum Ratings (Note 1)
Recommended Operating
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI = −0.5V
VI = VCC + 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO = −0.5V
VO = VCC + 0.5V
DC Output Voltage (VO)
DC Output Source
or Sink Current (IO)
DC VCC or Ground Current
per Output Pin (ICC or IGND)
Storage Temperature (TSTG)
Junction Temperature (TJ)
CDIP
−0.5V to +7.0V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
−20 mA
+20 mA
−0.5V to VCC + 0.5V
±50 mA
±50 mA
−65˚C to +150˚C
175˚C
Conditions
Supply Voltage (VCC)
’AC
2.0V to 6.0V
’ACT
4.5V to 5.5V
Input Voltage (VI)
Output Voltage (VO)
Operating Temperature (TA)
54AC/ACT
0V to VCC
0V to VCC
−55˚C to +125˚C
Minimum Input Edge Rate (V/t)
’AC Devices
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (V/t)
125 mV/ns
’ACT Devices
VIN from 0.8V to 2.0V
VCC @ 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
VCC
TA = −55˚C to +125˚C
Units
(V) Guaranteed Limits
Conditions
VIH Minimum High Level
Input Voltage
3.0
4.5
5.5
2.1
3.15
3.85
VOUT = 0.1V
V or VCC − 0.1V
VIL Maximum Low Level
Input Voltage
3.0
4.5
5.5
0.9
1.35
1.65
VOUT = 0.1V
V or VCC − 0.1V
VOH Minimum High Level
Output Voltage
3.0
4.5
2.9
4.4
IOUT = −50 µA
V
5.5 5.4
VOL Maximum Low Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
2.4
3.7
4.7
0.1
0.1
(Note 2)
VIN = VIL or VIH
IOH = −12 mA
V IOH = −24 mA
IOH = −24 mA
IOUT = 50 µA
V
5.5 0.1
IIN Maximum Input
Leakage Current
3.0
4.5
5.5
5.5
0.50
0.50
0.50
±1.0
(Note 2)
VIN = VIL or VIH
IOL = 12 mA
V IOL = 24 mA
IOL = 24 mA
µA VI = VCC, GND
IOLD
Minimum Dynamic
5.5
50
mA VOLD = 1.65V Max
IOHD
Output Current (Note 3)
5.5
−50
mA VOHD = 3.85V Min
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DC Characteristics for ’AC Family Devices (Continued)
Symbol
Parameter
ICC Maximum Quiescent
Supply Current
54AC
VCC TA = −55˚C to +125˚C
(V) Guaranteed Limits
5.5 80.0
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
Units
Conditions
µA VIN = VCC
or GND
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
VIH Minimum High Level
Input Voltage
VIL Maximum Low Level
Input Voltage
VOH Minimum High Level
Output Voltage
54ACT
VCC TA = −55˚C to +125˚C
(V) Guaranteed Limits
4.5 2.0
5.5 2.0
4.5 0.8
5.5 0.8
4.5 4.4
5.5 5.4
VOL Maximum Low Level
Output Voltage
4.5
5.5
4.5
5.5
3.70
4.70
0.1
0.1
IIN
ICCT
IOLD
IOHD
ICC
Maximum Input
Leakage Current
Maximum
ICC/Input
Minimum Dynamic
Output Current (Note 6)
Maximum Quiescent
Supply Current
4.5
5.5
5.5
5.5
5.5
5.5
5.5
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.
0.50
0.50
±1.0
1.6
50
−50
80.0
Units
Conditions
V VOUT = 0.1V
or VCC − 0.1V
V VOUT = 0.1V
or VCC − 0.1V
V IOUT = −50 µA
(Note 5)
VIN = VIL or VIH
V IOH = −24 mA
IOH = −24 mA
V IOUT = 50 µA
(Note 5)
VIN = VIL or VIH
V IOL = 24 mA
IOL = 24 mA
µA VI = VCC, GND
mA VI = VCC − 2.1V
mA VOLD = 1.65V Max
mA VOHD = 3.85V Min
µA VIN = VCC
or GND
AC Electrical Characteristics
Symbol
Parameter
tPLH Propagation Delay
Sn to Z or Z
VCC
(V)
(Note 8)
3.3
5.0
54AC
TA = −55˚C to +125˚C
CL = 50 pF
Min Max
1.0 22.0
1.0 15.5
Units
ns
Fig.
No.
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