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74F251ASJ PDF даташит

Спецификация 74F251ASJ изготовлена ​​​​«National» и имеет функцию, называемую «8-Input Multiplexer with TRI-STATE Outputs».

Детали детали

Номер произв 74F251ASJ
Описание 8-Input Multiplexer with TRI-STATE Outputs
Производители National
логотип National логотип 

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74F251ASJ Даташит, Описание, Даташиты
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
74F251APC
74F251ASC (Note 1)
74F251ASJ (Note 1)
Military
54F251ADM (Note 2)
54F251AFM (Note 2)
54F251ALL (Note 2)
Package
Number
N16E
J16A
M16A
M16D
W16A
E20A
Package Description
16-Lead (0 300 Wide) Molded Dual-In-Line
16-Lead Ceramic Dual-In-Line
16-Lead (0 150 Wide) Molded Small Outline JEDEC
16-Lead (0 300 Wide) Molded Small Outline EIAJ
16-Lead Cerpack
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
Pin Assignment for
DIP SOIC and Flatpak
Pin Assignment
for LCC
IEEE IEC
TL F 9504–3
TL F 9504 – 1
TL F 9504 – 2
TL F 9504–5
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9504
RRD-B30M75 Printed in U S A









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74F251ASJ Даташит, Описание, Даташиты
Unit Loading Fan Out
Pin Names
S0 – S2
OE
I0 – I7
Z
Z
Description
Select Inputs
TRI-STATE Output Enable Input (Active LOW)
Multiplexer Inputs
TRI-STATE Multiplexer Output
Complementary TRI-STATE Multiplexer Output
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
150 40 (33 3)
150 40 (33 3)
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b3 mA 24 mA (20 mA)
b3 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 S0 S1 S2 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(I0S0S1 S2 a I1S0S1S2 a
I2S0S1S2 a I3S0S1S2 a
I4S0S1S2 a I5S0S1S2 a
I6S0S1S2 a I7S0S1S2)
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
Logic Diagram
Truth Table
Inputs
OE S2 S1
H XX
L LL
L LL
L LH
LL
LH
LH
LH
LH
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
H
L
L
H
H
S0
X
L
H
L
H
L
H
L
H
Outputs
ZZ
ZZ
I0 I0
I1 I1
I2 I2
I3 I3
I4 I4
I5 I5
I6 I6
I7 I7
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









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74F251ASJ Даташит, Описание, Даташиты
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
b65 C to a150 C
Ambient Temperature under Bias
b55 C to a125 C
Junction Temperature under Bias
Plastic
b55 C to a175 C
b55 C to a150 C
VCC Pin Potential to
Ground Pin
b0 5V to a7 0V
Input Voltage (Note 2)
b0 5V to a7 0V
Input Current (Note 2)
b30 mA to a5 0 mA
Voltage Applied to Output
in HIGH State (with VCC e 0V)
Standard Output
TRI-STATE Output
b0 5V to VCC
b0 5V to a5 5V
Current Applied to Output
in LOW State (Max)
twice the rated IOL (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
Commercial
b55 C to a125 C
0 C to a70 C
Supply Voltage
Military
Commercial
a4 5V to a5 5V
a4 5V to a5 5V
DC Electrical Characteristics
Symbol
VIH
VIL
VCD
VOH
VOL
IIH
IBVI
ICEX
VID
IOD
IIL
IOZH
IOZL
IOS
IZZ
ICCL
ICCZ
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW
Voltage
Input HIGH
Current
54F 10% VCC
54F 10% VCC
74F 10% VCC
74F 10% VCC
74F 5% VCC
74F 5% VCC
54F 10% VCC
74F 10% VCC
54F
74F
Input HIGH Current
Breakdown Test
54F
74F
Output HIGH
Leakage Current
54F
74F
Input Leakage
Test
74F
Output Leakage
Circuit Current
74F
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
Power Supply Current
54F 74F
Min Typ Max
20
08
b1 2
25
24
25
24
27
27
05
05
20 0
50
100
70
250
50
4 75
3 75
b0 6
50
b50
b60
b150
500
15 22
16 24
Units
V
V
V
V
V
mA
mA
mA
V
mA
mA
mA
mA
mA
mA
mA
mA
VCC
Min
Min
Min
Max
Max
Max
00
00
Max
Max
Max
Max
0 0V
Max
Max
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
IIN e b18 mA
IOH e b1 mA
IOH e b3 mA
IOH e b1 mA
IOH e b3 mA
IOH e b1 mA
IOH e b3 mA
IOL e 20 mA
IOL e 24 mA
VIN e 2 7V
VIN e 7 0V
VOUT e VCC
IID e 1 9 mA
All Other Pins Grounded
VIOD e 150 mV
All Other Pins Grounded
VIN e 0 5V
VOUT e 2 7V
VOUT e 0 5V
VOUT e 0V
VOUT e 5 25V
VO e LOW
VO e HIGH Z
3










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74F251ASJ8-Input Multiplexer with TRI-STATE OutputsNational
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