Part Number: 54F257ADMQB

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Technical Document


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TL/F/9507
54F/74F257A Quad 2-Input Multiplexer with TRI-STATE Outputs
November 1994
54F/74F257A
Quad 2-Input Multiplexer with TRI-STATE
É
Outputs
General Description
The ’F257A is a quad 2-input multiplexer with TRI-STATE
outputs. Four bits of data from two sources can be selected
using a Common Data Select input. The four outputs pres-
ent the selected data in true (non-inverted) form. The out-
puts may be switched to a high impedance state with a
HIGH on the common Output Enable (OE
) input, allowing
the outputs to interface directly with bus-oriented systems.
Features
Y
Multiplexer expansion by tying outputs together
Y
Non-inverting TRI-STATE outputs
Y
Input clamp diodes limit high-speed termination effects
Y
Guaranteed 4000V minimum ESD protection
Commercial Military
Package
Package Description
Number
74F257APC N16E 16-Lead (0.300
×
Wide) Molded Dual-In-Line
54F257ADM (Note 2) J16A 16-Lead Ceramic Dual-In-Line
74F257ASC (Note 1) M16A 16-Lead (0.150
×
Wide) Molded Small Outline, JEDEC
74F257ASJ (Note 1) M16D 16-Lead (0.300
×
Wide) Molded Small Outline, EIAJ
54F257AFM (Note 2) W16A 16-Lead Cerpack
54F257ALL (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/95073
IEEE/IEC
TL/F/95075
Pin Assignment
for DIP, SOIC and Flatpak
TL/F/95071
Pin Assignment
for LCC
TL/F/95072
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 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 Common Data Select Input 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
0a
–I
0d
Data Inputs from Source 0 1.0/1.0 20 mA/
b
0.6 mA
I
1a
–I
1d
Data Inputs from Source 1 1.0/1.0 20 mA/
b
0.6 mA
Z
a
–Z
d
TRI-STATE Multiplexer Outputs 150/40 (33.3)
b
3 mA/24 mA (20 mA)
Functional Description
The ’F257A is a quad 2-input multiplexer with TRI-STATE
outputs. It selects four bits of data from two sources under
control of a Common Data Select input. When the Select
input is LOW, the I
0x
inputs are selected and when Select is
HIGH, the I
1x
inputs are selected. The data on the selected
inputs appears at the outputs in true (non-inverted) form.
The device is the logic implementation of a 4-pole, 2-posi-
tion switch where the position of the switch is determined by
the logic levels supplied to the Select input. The logic equa-
tion for the outputs is shown below:
Z
n
e
OE
#
(I
n
#
S
a
I
on
#
S)
When the Output Enable input (OE) is HIGH, the outputs are
forced to a high impedance OFF state. If the outputs 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. Designers should ensure the Output En-
able signals to TRI-STATE devices whose outputs are tied
together are designed so there is no overlap.
Truth Table
Output Select Data
Output
Enable Input Inputs
OE SI
0
I
1
Z
HXXXZ
LHXLL
LHXHH
LLLXL
LLHXH
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
Logic Diagram
TL/F/95074
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
§
Cto
a
150
§
C
Ambient Temperature under Bias
b
55
§
Cto
a
125
§
C
Junction Temperature under Bias
b
55
§
Cto
a
175
§
C
Plastic
b
55
§
Cto
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)
ESD Last Passing Voltage (Min) 4000V
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
§
Cto
a
125
§
C
Commercial 0
§
Cto
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
eb
18 mA
V
OH
Output HIGH 54F 10% V
CC
2.5 I
OH
eb
1mA
Voltage 54F 10% V
CC
2.4 I
OH
eb
3mA
74F 10% V
CC
2.5
V Min
I
OH
eb
1mA
74F 10% V
CC
2.4 I
OH
eb
3mA
74F 5% V
CC
2.7 I
OH
eb
1mA
74F 5% V
CC
2.7 I
OH
eb
3mA
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
mA Max
V
IN
e
2.7V
Current 74F 5.0
I
BVI
Input HIGH Current 54F 100
mA Max
V
IN
e
7.0V
Breakdown Test 74F 7.0
I
CEX
Output HIGH 54F 250
mA 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 mA 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 mA Max V
OUT
e
2.7V
I
OZL
Output Leakage Current
b
50 mA 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 mA 0.0V V
OUT
e
5.25V
I
CCH
Power Supply Current 9.0 15 mA Max V
O
e
HIGH
I
CCL
Power Supply Current 14.5 22 mA Max V
O
e
LOW
I
CCZ
Power Supply Current 15 23 mA Max V
O
e
HIGH Z
3
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