TL F 11652
74LVX3L383
10-Bit
Low
Power
Bus-Exchange
Switch
December 1996
74LVX3L383
10-Bit Low Power Bus-Exchange Switch
General Description
The LVX3L383 provides two sets of high-speed CMOS TTL-
compatible bus switches The low on resistance of the
switch allows inputs to be connected to outputs without
adding propagation delay or generating additional ground
bounce noise The device operates as a 10-bit bus switch or
a 5-bit bus exchanger The bus exchange (BX) signal pro-
vides nibble swapping of the AB and CD pairs of signals
This exchange configuration allows byte swapping of buses
in systems It can also be used as a quad 2-to-1 multiplexer
and to create low delay barrel shifters The bus enable (BE)
signal turns the switches on
Features
Y
5X switch connection between two ports
Y
Zero propagation delay
Y
Ultra low power with 0 2 mA typical I
CC
Y
Zero ground bounce in flow-through mode
Y
Control inputs compatible with TTL level
Y
Available in SOIC TSSOP and QSOP (SSOP 0 15
body width) packages
Logic Diagram
TL F 11652 1
Truth Table
BE
BX
A
0
A
4
B
0
B
4
Function
H
X
High-Z State
High-Z State
Disconnect
L
L
C
0
C
4
D
0
D
4
Connect
L
H
D
0
D
4
C
0
C
4
Exchange
Connection Diagram
Pin Assignment for
SOIC QSOP and TSSOP
TL F 11652 2
Pin Names
Description
BE
Bus Switch Enable
BX
Bus Exchange
A
0
A
4
B
0
B
4
Buses A B
C
0
C
4
D
0
D
4
Buses C D
SOIC JEDEC
QSOP
TSSOP
Order Number
74LVX3L383WM
74LVX3L383QSC
74LVX3L383MTC
74LVX3L383WMX
74LVX3L383QSCX
74LVX3L383MTCX
See NS
M24B
MQA24
MTC24
Package Number
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation
RRD-B30M17 Printed in U S A
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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
)
b
0 5V to
a
7 0V
DC Switch Voltage (V
S
)
b
0 5V to
a
7 0V
DC Input Voltage (V
I
) (Note 2)
b
0 5V to
a
7 0V
DC Input Diode Current (I
IN
) with V
I
k
0
b
20 mA
DC Output (I
O
) Sink Current
120 mA
Storage Temperature Range (T
STG
)
b
65 C to
a
150 C
Power Dissipation
0 5W
Note 1
The ``Absolute Maximum Ratings'' are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ``Electrical Characteristics''
table are not guaranteed at the absolute maximum ratings
The ``Recommended Operating Conditions'' table will define
the conditions for actual device operation
Note 2
The input and output negative voltage ratings may
be exceeded if the input and output diode current ratings
are observed
Recommended Operating
Conditions
Supply Voltage (V
CC
)
4 0V to 5 5V
Free Air Operating Temperature (T
A
)
b
40 C to
a
85 C
DC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
74LVX3L383
Units
Conditions
T
A
e b
40 C to
a
85 C
Min
Typ
Max
(Note 5)
V
IK
Maximum Clamp
4 75
b
1 2
V
I
IN
e b
18 mA
Diode Voltage
V
IH
Minimum High
4 75 5 25
2 0
V
Level Input Voltage
V
IL
Maximum Low
4 75 5 25
0 8
Level Input Voltage
I
IN
Maximum Input
0
10
m
A
0
s
V
IN
s
5 25V
Leakage Current
5 25
g
1
I
OZ
Maximum TRI-STATE
5 25
g
10
m
A
0
s
A B
s
V
CC
I O Leakage
I
OS
Short Circuit Current
4 75
100
mA
V
I
(A) V
I
(B)
e
0V
V
I
(B) V
I
(A)
e
4 75V
R
ON
Switch On
4 75
5
7
X
V
I
e
0V I
ON
e
30 mA
Resistance (Note 3)
10
15
X
V
I
e
2 4V I
ON
e
15 mA
I
CC
Maximum Quiescent
5 25
0 2
10
m
A
V
I
e
V
CC
GND
Supply Current
I
O
e
0
D
I
CC
Increase in I
CC
5 25
2 5
mA
V
IN
e
3 15V I
O
e
0
per Input (Note 4)
Per Control Input
Note 3
Measured by voltage drop between A and B pin at indicated current through the switch On resistance is determined by the lower of the voltages on the two
(A or B) pins
Note 4
Per TTL driven input (V
IN
e
3 15V control inputs only) A and B pins do not contribute to I
CC
Note 5
All typical values are at V
CC
e
5 0V T
A
e
25 C
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2
AC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
74LVX3L383
Units
T
A
e b
40 C to
a
85 C
C
L
e
50 pF
Min
Typ
Max
(Note 5)
t
PLH
Data Propagation Delay
4 75
0 25
ns
t
PHL
A
n
to B
n
or B
n
to A
n
(Note 6)
t
PLH
Switch Exchange Time
4 75
1 5
6 5
ns
t
PHL
BX to A
n
or B
n
t
PZL
Switch Enable Time
4 75
1 5
6 5
ns
t
PZH
BE to A
n
B
n
t
PLZ
Switch Disenable Time
4 75
1 5
5 5
ns
t
PHZ
BE to A
n
B
n
Note 5
All typical values are at V
CC
e
5 0V T
A
e
25 C
Note 6
This parameter is guaranteed by design but not tested The bus switch contributes no propagation delay other than the RC delay of the On resistance of
the switch and the load capacitance The time constant for the switch and alone is of the order of 0 25 ns for 50 pF load Since this time constant is much smaller
than the rise fall times of typical driving signals it adds very little propagation delay to the system Propagation delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side
Capacitance
(Note)
Symbol
Parameter
Typ
Max
Units
Conditions
C
IN
Control Input Capacitance
4
6
pF
V
CC
e
5 0V
C
I O
(OFF)
Input Output Capacitance
9
13
pF
V
CC
e
5 0V
Note
Capacitance is characterized but not tested
74LVX3L383 V
IN
vs R
ON
(Typ)
TL F 11652 4
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3
74LVX3L383 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
TL F 11652 5
Physical Dimensions
inches
millimeters
24-Lead (0 300 Wide) Small Outline Package
Order Number 74LVX3L383WM or 74LVX3L383WMX
NS Package Number M24B
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4
Physical Dimensions
inches (Continued)
24-Lead (0 150 Wide) Shrink Small Outline Package JEDEC (QSC)
(also known as QSOP)
Order Number 74LVX3L383QSC or 74LVX3L383QSCX
NS Package Number MQA24
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5
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