TL F 11653
74LVX3L384
10-Bit
Low
Power
Bus
Switch
February 1996
74LVX3L384
10-Bit Low Power Bus Switch
General Description
The LVX3L384 provides 10 bits 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 is organized as two 5-bit switches
with separate bus enable (BE) signals When BE is low the
switch is on and port A is connected to port B When BE is
high the switch is open and a high-impedance state exists
between the two ports
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)
Logic Diagram
TL F 11653 1
Connection Diagram
Pin Assignment for
SOIC QSOP and TSSOP
TL F 11653 2
Truth Table
BE A
BE B
B
0
B
4
B
5
B
9
Function
L
L
A
0
A
4
A
5
A
9
Connect
L
H
A
0
A
4
HIGH-Z State
Connect
H
L
HIGH-Z State
A
5
A
9
Connect
H
H
HIGH-Z State
HIGH-Z State
Disconnect
Pin Names
Description
BE A BE B
Bus Switch Enable
A
0
A
9
Bus A
B
0
B
9
Bus B
SOIC JEDEC
QSOP
TSSOP
Order Number
74LVX3L384WM
74LVX3L384QSC
74LVX3L384MTC
74LVX3L384WMX
74LVX3L384QSCX
74LVX3L384MTCX
See NS Package Number
M24B
MQA24
MTC24
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 5 to
a
7 0V
DC Input Input Voltage (V
I
) (Note 2)
b
0 5 to
a
7 0V
DC Input Diode Current 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)
74LVX3L384
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)
74LVX3L384
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
T
PHL
An to Bn or Bn to An
4 75
0 25
ns
(Note 6)
T
PZL
Switch Enable Time
4 75
1 5
6 5
ns
T
PZH
BE
A
BE
B
to An Bn
T
PLZ
Switch Disable Time
4 75
1 5
5 5
ns
T
PHZ
BE
A
BE
B
to An Bn
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
74LVX3L384 V
IN
vs R
ON
(Typ)
TL F 11653 3
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3
74LVX3L384 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 11653 4
Physical Dimensions
inches
millimeters
24-Lead (0 300 Wide) Small Outline Package JEDEC
Order Number 74LVX3L384WM or 74LVX3L384WMX
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 74LVX3L384QSC or 74LVX3L384QSCX
NS Package Number MQA24
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5
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