TL F 9504
54F74F251A
8-Input
Multiplexer
with
TRI-STATE
Outputs
November 1994
54F 74F251A
8-Input Multiplexer with TRI-STATE
Outputs
General Description
The 'F251A is a high-speed 8-input digital multiplexer It pro-
vides in one package the ability to select one bit of data
from up to eight sources It can be used as a universal func-
tion generator to generate any logic function of four vari-
ables Both assertion and negation outputs are provided
Features
Y
Multifunctional capability
Y
On-chip select logic decoding
Y
Inverting and non-inverting TRI-STATE outputs
Commercial
Military
Package
Package Description
Number
74F251APC
N16E
16-Lead (0 300 Wide) Molded Dual-In-Line
54F251ADM (Note 2)
J16A
16-Lead Ceramic Dual-In-Line
74F251ASC (Note 1)
M16A
16-Lead (0 150 Wide) Molded Small Outline JEDEC
74F251ASJ (Note 1)
M16D
16-Lead (0 300 Wide) Molded Small Outline EIAJ
54F251AFM (Note 2)
W16A
16-Lead Cerpack
54F251ALL (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
TL F 9504 3
IEEE IEC
TL F 9504 5
Pin Assignment for
DIP SOIC and Flatpak
TL F 9504 1
Pin Assignment
for LCC
TL F 9504 2
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M75 Printed in U S A
Unit Loading Fan Out
54F 74F
Pin Names
Description
U L
Input I
IH
I
IL
HIGH LOW
Output I
OH
I
OL
S
0
S
2
Select Inputs
1 0 1 0
20 mA
b
0 6 mA
OE
TRI-STATE Output Enable Input (Active LOW)
1 0 1 0
20 mA
b
0 6 mA
I
0
I
7
Multiplexer Inputs
1 0 1 0
20 mA
b
0 6 mA
Z
TRI-STATE Multiplexer Output
150 40 (33 3)
b
3 mA 24 mA (20 mA)
Z
Complementary TRI-STATE Multiplexer Output
150 40 (33 3)
b
3 mA 24 mA (20 mA)
Functional Description
This device is a logical 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 assertion and
negation outputs are provided The Output Enable input
(OE) is active LOW When it is activated the logic function
provided at the output is
Z
e
OE
(I
0
S
0
S
1
S
2
a
I
1
S
0
S
1
S
2
a
I
2
S
0
S
1
S
2
a
I
3
S
0
S
1
S
2
a
I
4
S
0
S
1
S
2
a
I
5
S
0
S
1
S
2
a
I
6
S
0
S
1
S
2
a
I
7
S
0
S
1
S
2
)
When the Output Enable is HIGH both outputs are in the
high impedance (High Z) state This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together When the outputs of the TRI-STATE devices are
tied together all but one device must be in the high imped-
ance state to avoid high currents that would exceed the
maximum ratings The Output Enable signals should be de-
signed to ensure there is no overlap in the active LOW por-
tion of the enable voltages
Truth Table
Inputs
Outputs
OE
S
2
S
1
S
0
Z
Z
H
X
X
X
Z
Z
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
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
Logic Diagram
TL F 9504 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2
Absolute Maximum Ratings
(Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Storage Temperature
b
65 C to
a
150 C
Ambient Temperature under Bias
b
55 C to
a
125 C
Junction Temperature under Bias
b
55 C to
a
175 C
Plastic
b
55 C to
a
150 C
V
CC
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 V
CC
e
0V)
Standard Output
b
0 5V to V
CC
TRI-STATE Output
b
0 5V to
a
5 5V
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
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
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
b
55 C to
a
125 C
Commercial
0 C to
a
70 C
Supply Voltage
Military
a
4 5V to
a
5 5V
Commercial
a
4 5V to
a
5 5V
DC Electrical Characteristics
Symbol
Parameter
54F 74F
Units
V
CC
Conditions
Min
Typ
Max
V
IH
Input HIGH Voltage
2 0
V
Recognized as a HIGH Signal
V
IL
Input LOW Voltage
0 8
V
Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
b
1 2
V
Min
I
IN
e b
18 mA
V
OH
Output HIGH
54F 10% V
CC
2 5
I
OH
e b
1 mA
Voltage
54F 10% V
CC
2 4
I
OH
e b
3 mA
74F 10% V
CC
2 5
V
Min
I
OH
e b
1 mA
74F 10% V
CC
2 4
I
OH
e b
3 mA
74F 5% V
CC
2 7
I
OH
e b
1 mA
74F 5% V
CC
2 7
I
OH
e b
3 mA
V
OL
Output LOW
54F 10% V
CC
0 5
V
Min
I
OL
e
20 mA
Voltage
74F 10% V
CC
0 5
I
OL
e
24 mA
I
IH
Input HIGH
54F
20 0
m
A
Max
V
IN
e
2 7V
Current
74F
5 0
I
BVI
Input HIGH Current
54F
100
m
A
Max
V
IN
e
7 0V
Breakdown Test
74F
7 0
I
CEX
Output HIGH
54F
250
m
A
Max
V
OUT
e
V
CC
Leakage Current
74F
50
V
ID
Input Leakage
74F
4 75
V
0 0
I
ID
e
1 9 mA
Test
All Other Pins Grounded
I
OD
Output Leakage
74F
3 75
m
A
0 0
V
IOD
e
150 mV
Circuit Current
All Other Pins Grounded
I
IL
Input LOW Current
b
0 6
mA
Max
V
IN
e
0 5V
I
OZH
Output Leakage Current
50
m
A
Max
V
OUT
e
2 7V
I
OZL
Output Leakage Current
b
50
m
A
Max
V
OUT
e
0 5V
I
OS
Output Short-Circuit Current
b
60
b
150
mA
Max
V
OUT
e
0V
I
ZZ
Bus Drainage Test
500
m
A
0 0V
V
OUT
e
5 25V
I
CCL
Power Supply Current
15
22
mA
Max
V
O
e
LOW
I
CCZ
Power Supply Current
16
24
mA
Max
V
O
e
HIGH Z
3
AC Electrical Characteristics
74F
54F
74F
T
A
e a
25 C
T
A
V
CC
e
Mil
T
A
V
CC
e
Com
Symbol
Parameter
V
CC
e a
5 0V
C
L
e
50 pF
C
L
e
50 pF
Units
C
L
e
50 pF
Min
Typ
Max
Min
Max
Min
Max
t
PLH
Propagation Delay
3 5
6 0
9 0
3 5
11 5
3 5
9 5
ns
t
PHL
S
n
to Z
3 2
5 0
7 5
3 2
8 0
3 2
7 5
t
PLH
Propagation Delay
4 5
7 5
10 5
3 5
14 0
4 5
12 5
ns
t
PHL
S
n
to Z
4 0
6 0
8 5
3 0
10 5
4 0
9 0
t
PLH
Propagation Delay
3 0
5 0
6 5
2 5
8 0
3 0
7 0
ns
t
PHL
I
n
to Z
1 5
2 5
4 0
1 5
6 0
1 5
5 0
t
PLH
Propagation Delay
3 5
5 0
7 0
2 5
9 0
2 5
8 0
ns
t
PHL
I
n
to Z
3 5
5 5
7 0
3 5
9 0
3 5
7 5
t
PZH
Output Enable Time
2 5
4 3
6 0
2 0
7 0
2 5
7 0
t
PZL
OE to Z
2 5
4 3
6 0
2 5
7 5
2 5
6 5
ns
t
PHZ
Output Disable Time
2 5
4 0
5 5
2 5
6 0
2 5
6 0
t
PLZ
OE to Z
1 5
3 0
4 5
1 5
5 0
1 5
4 5
t
PZH
Output Enable Time
3 5
5 0
7 0
3 0
8 5
3 0
7 5
t
PZL
OE to Z
3 5
5 5
7 5
3 5
9 0
3 5
8 0
ns
t
PHZ
Output Disable Time
2 0
3 8
5 5
2 0
5 5
2 0
5 5
t
PLZ
OE to Z
1 5
3 0
4 5
1 5
5 5
1 5
4 5
4
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
251A
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 (
b
55 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
Physical Dimensions
inches (millimeters)
20-Lead Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
5
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
6
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
7
54F74F251A
8-Input
Multiplexer
with
TRI-STATE
Outputs
Physical Dimensions
inches (millimeters) (Continued)
16-Lead Ceramic Flatpak (F)
NS Package Number W16A
LIFE SUPPORT POLICY
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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