54AC151.pdf
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Pobierz
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
I
CC
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
DS100270-6
Pin
Names
Description
I
0
–I
7
Data Inputs
S
0
–S
2
Select Inputs
E
Enable Input
Z
Data Output
Z
Inverted Data Output
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
www.national.com
© 1998 National Semiconductor Corporation
DS100270
Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
DS100270-2
DS100270-3
Truth Table
Inputs
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
a
nd
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 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.
Outputs
E
S
2
S
1
S
0
Z
Z
H
X
X
X
H
L
L
L
L
L
I
0
I
0
L
L
L
H
I
1
I
1
L
L
H
L
I
2
I
2
L
L
H
H
I
3
I
3
L
H
L
L
I
4
I
4
L
H
L
H
I
5
I
5
L
H
H
L
I
6
I
6
L
H
H
H
I
7
I
7
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
www.national.com
2
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.
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
)
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
2.0V to 6.0V
−0.5V to +7.0V
’ACT
4.5V to 5.5V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V
Input Voltage (V
I
)
0VtoV
CC
−20 mA
Output Voltage (V
O
)
0VtoV
CC
V
I
=
V
CC
+ 0.5V
+20 mA
Operating Temperature (T
A
)
54AC/ACT
DC Input Voltage (V
I
)
−0.5V to V
CC
+ 0.5V
−55˚C to +125˚C
DC Output Diode Current (I
OK
)
V
O
=
−0.5V
Minimum Input Edge Rate (
D
V/
D
t)
−20 mA
’AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.3V, 4.5V, 5.5V
V
O
=
V
CC
+ 0.5V
+20 mA
DC Output Voltage (V
O
)
−0.5V to V
CC
+ 0.5V
125 mV/ns
DC Output Source
or Sink Current (I
O
)
Minimum Input Edge Rate (
D
V/
D
t)
±
50 mA
’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
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
T
A
=
−55˚C to +125˚C
Symbol
Parameter
V
CC
Units
Conditions
(V)
Guaranteed Limits
V
OUT
=
0.1V
V
IH
Minimum High Level
3.0
2.1
Input Voltage
4.5
3.15
V
or V
CC
− 0.1V
5.5
3.85
V
OUT
=
0.1V
V
IL
Maximum Low Level
3.0
0.9
Input Voltage
4.5
1.35
V
or V
CC
− 0.1V
5.5
1.65
I
OUT
=
−50 µA
V
OH
Minimum High Level
3.0
2.9
Output Voltage
4.5
4.4
V
5.5
5.4
(Note 2)
V
IN
=
V
IL
or V
IH
I
OH
=
−12 mA
3.0
2.4
I
OH
=
−24 mA
4.5
3.7
V
I
OH
=
−24 mA
5.5
4.7
I
OUT
=
50 µA
V
OL
Maximum Low Level
3.0
0.1
Output Voltage
4.5
0.1
V
5.5
0.1
(Note 2)
V
IN
=
V
IL
or V
IH
I
OL
=
12 mA
3.0
0.50
I
OL
=
24 mA
4.5
0.50
V
I
OL
=
24 mA
5.5
0.50
±
1.0
V
I
=
V
CC
, GND
I
IN
Maximum Input
5.5
µA
Leakage Current
V
OLD
=
1.65V Max
I
OLD
Minimum Dynamic
Output Current (Note 3)
5.5
50
mA
V
OHD
=
3.85V Min
I
OHD
5.5
−50
mA
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4
DC Characteristics for ’AC Family Devices
(Continued)
54AC
T
A
=
−55˚C to +125˚C
Symbol
Parameter
V
CC
Units
Conditions
(V)
Guaranteed Limits
V
IN
=
V
CC
I
CC
Maximum Quiescent
5.5
80.0
µA
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:
I
IN
and I
CC
@
3.0V are guaranteed to be less than or equal to the respective limit
@
5.5V V
CC
.
I
CC
for 54AC
@
25˚C is identical to 74AC
@
25˚C
DC Characteristics for ’ACT Family Devices
54ACT
T
A
=
−55˚C to +125˚C
Symbol
Parameter
V
CC
Units
Conditions
(V)
Guaranteed Limits
V
OUT
=
0.1V
V
IH
Minimum High Level
4.5
2.0
V
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
I
OH
=
−24 mA
4.5
3.70
V
I
OH
=
−24 mA
5.5
4.70
I
OUT
=
50 µA
V
OL
Maximum Low Level
4.5
0.1
V
Output Voltage
5.5
0.1
(Note 5)
V
IN
=
V
IL
or V
IH
I
OL
=
24 mA
4.5
0.50
V
I
OL
=
24 mA
5.5
0.50
±
1.0
V
I
=
V
CC
, GND
I
IN
Maximum Input
5.5
µA
Leakage Current
V
I
=
V
CC
− 2.1V
I
CCT
Maximum
5.5
1.6
mA
I
CC
/Input
V
OLD
=
1.65V Max
I
OLD
Minimum Dynamic
5.5
50
mA
V
OHD
=
3.85V Min
I
OHD
Output Current (Note 6)
5.5
−50
mA
V
IN
=
V
CC
I
CC
Maximum Quiescent
5.5
80.0
µA
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:
I
CC
for 54ACT
@
25˚C is identical to 74ACT
@
25˚C.
AC Electrical Characteristics
54AC
V
CC
T
A
= −55˚C to +125˚C
Fig.
Symbol
Parameter
Units
(V)
C
L
= 50 pF
No.
(Note 8)
Min
Max
t
PLH
Propagatio
n
Delay
3.3
1.0
22.0
ns
S
n
toZorZ
5.0
1.0
15.5
5
www.national.com
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