TL/F/11597
74LVX245
Low
Voltage
Octal
Bidirectional
Transceiver
October 1995
74LVX245
Low Voltage Octal Bidirectional Transceiver
General Description
The LVX245 contains eight non-inverting bidirectional buff-
ers is intended for bus-oriented applications. The Transmit/
Receive (T/R) input determines the direction of data flow
through the bidirectional transceiver. Transmit (active-
HIGH) enables data from A ports to B ports; Receive (ac-
tive-LOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports by
placing them in a HIGH-Z condition.
Features
Y
Ideal for low power/low noise 3.3V applications
Y
Available in SOIC JEDEC, SOIC EIAJ, SSOP and
TSSOP packages
Y
Guaranteed simultaneous switching noise level and
dynamic threshold performance
Logic Symbols
Connection Diagram
TL/F/11597 – 1
TL/F/11597 – 5
Pin Assignment for
SSOP, SOIC and TSSOP
TL/F/11597 – 3
Pin
Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0
– A
7
Side A TRI-STATE
É
Inputs or TRI-STATE Outputs
B
0
– B
7
Side B TRI-STATE Inputs or TRI-STATE Outputs
Truth Table
Inputs
Outputs
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
HIGH-Z State
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
SOIC JEDEC
SOIC EIAJ
SSOP TYPE I
TSSOP
Order Number
74LVX245M
74LVX245SJ
74LVX245MTC
74LVX245MX
74LVX245SJX
74LVX245MSCX
74LVX245MTCX
See NS Package Number
M20B
M20D
MSC20
MTC20
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
(Note)
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 Input Diode Current (I
IK
)
V
I
e b
0.5V
b
20 mA
DC Input Voltage T/R, OE (V
I
)
b
0.5V to 7V
DC Diode Current (I
OK
)
V
O
e b
0.5V
b
20 mA
V
O
e
V
CC
a
0.5V
a
20 mA
DC Bus I/O Voltage (V
I/O
)
b
0.5V to V
CC
a
0.5V
DC Output Source
or Sink Current (I
O
)
g
25 mA
DC V
CC
or Ground Current
(I
CC
or I
GND
)
g
75 mA
Storage Temperature (T
STG
)
b
65
§
C to
a
150
§
C
Power Dissipation
180 mW
Note:
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.
Recommended Operating
Conditions
Supply Voltage (V
CC
)
2.0V to 3.6V
Input Voltage T/R, OE (V
I
)
0V to 5.5V
Bus I/O Voltage (V
I/O
)
0V to V
CC
Operating Temperature (T
A
)
b
40
§
C to
a
85
§
C
Input Rise and Fall Time (Dt/DV)
0 ns/V to 100 ns/V
DC Electrical Characteristics
Symbol
Parameter
V
CC
74LVX245
74LVX245
Units
Conditions
T
A
e a
25
§
C
T
A
e
b
40
§
C to
a
85
§
C
Min
Typ
Max
Min
Max
V
IH
High Level
2.0
1.5
1.5
Input
3.0
2.0
2.0
V
Voltage
3.6
2.4
2.4
V
IL
Low Level
2.0
0.5
0.5
Input
3.0
0.8
0.8
V
Voltage
3.6
0.8
0.8
V
OH
High Level
2.0
1.9
2.0
1.9
V
IN
e
V
IH
or V
IL
I
OH
e b
50 mA
Output
3.0
2.9
3.0
2.9
V
I
OH
e b
50 mA
Voltage
3.0
2.58
2.48
I
OH
e b
4 mA
V
OL
Low Level
2.0
0.0
0.1
0.1
V
IN
e
V
IH
or V
IL
I
OL
e
50 mA
Output
3.0
0.0
0.1
0.1
V
I
OL
e
50 mA
Voltage
3.0
0.36
0.44
I
OL
e
4 mA
I
OZ
TRI-STATE
g
0.25
g
2.5
V
IN
e
V
IH
or V
IL
Output
3.6
m
A
V
OUT
e
V
CC
or GND
Off-State
Current
I
IN
Input
g
0.1
g
1.0
V
IN
e
5.5V or GND
Leakage
3.6
m
A
Current
I
CC
Quiescent
4.0
40.0
V
IN
e
V
CC
or GND
Supply
3.6
m
A
Current
2
Noise Characteristics
Symbol
Parameter
V
CC
(V)
74LVX245
Units
Conditions
C
L
(pF)
T
A
e
25
§
C
Typ
Limit
V
OLP
Quiet Output Maximum Dynamic V
OL
3.3
0.5
0.8
V
50
V
OLV
Quiet Output Minimum Dynamic V
OL
3.3
b
0.5
b
0.8
V
50
V
IHD
Minimum High Level Dynamic Input Voltage
3.3
2.0
V
50
V
ILD
Maximum Low Level Dynamic Input Voltage
3.3
0.8
V
50
Note:
Input t
r
e
t
f
e
3 ns
AC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
74LVX245
74LVX245
Units
Conditions
T
A
e a
25
§
C
T
A
e
b
40
§
C to
a
85
§
C
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay Time
2.7
6.1
10.7
1.0
13.5
ns
C
L
e
15 pF
t
PHL
8.6
14.2
1.0
17.0
C
L
e
50 pF
3.3
g
0.3
4.7
6.8
1.0
8.0
C
L
e
15 pF
7.2
10.1
1.0
11.5
C
L
e
50 pF
t
PZL
TRI-STATE Output
2.7
9.0
16.9
1.0
20.5
ns
C
L
e
15 pF, R
L
e
1 kX
t
PZH
Enable Time
11.5
20.4
1.0
24.0
C
L
e
50 pF, R
L
e
1 kX
3.3
g
0.3
7.1
11.0
1.0
13.0
C
L
e
15 pF, R
L
e
1 kX
9.6
14.5
1.0
16.5
C
L
e
50 pF, R
L
e
1 kX
t
PLZ
TRI-STATE Output
2.7
11.5
18.0
1.0
21.0
ns
C
L
e
50 pF, R
L
e
1 kX
t
PHZ
Disable Time
3.3
g
0.3
9.6
12.8
1.0
14.5
C
L
e
50 pF, R
L
e
1 kX
t
OSLH
Output to Output Skew
2.7
1.5
1.5
ns
C
L
e
50 pF (Note 1)
t
OSHL
(Note 1)
Note 1:
Parameter guaranteed by design. t
OSLH
e
l
t
PLHm
b
t
PLHn
l
, t
OSHL
e
l
t
PHLm
b
t
PHLn
l
Capacitance
Symbol
Parameter
74LVX245
74LVX245
Units
T
A
e a
25
§
C
T
A
e
b
40
§
C to
a
85
§
C
Min
Typ
Max
Min
Max
C
IN
Input Capacitance T/R, OE
4
10
10
pF
C
I/O
Output Capacitance A
n
, B
n
8
pF
C
PD
Power Dissipation
21
pF
Capacitance (Note 1)
Note 1:
C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption
without load.
Average operating current can be obtained by the equation: I
CC(opr.)
e
C
PD
c
V
CC
c
f
IN
a
I
CC
8 (per bit)
3
74LVX245 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/11597 – 7
Physical Dimensions
inches (millimeters)
20-Lead Small Outline Integrated Circuit (M)
Order Number 74LVX245M or 74LVX245MX
NS Package Number M20B
4
Physical Dimensions
inches (millimeters)
20-Lead Small Outline Package EIAJ SOIC (SJ)
Order Number 74LVX245SJ or 74LVX245SJX
NS Package Number M20D
Dimensions are in millimeters
20-Lead Plastic EIAJ SSOP Type I (MSC)
Order Number 74LVX245MSCX
NS Package Number MSC20
5
74LVX245
Low
Voltage
Octal
Bidirectional
Transceiver
Physical Dimensions
All dimensions in millimeters (Continued)
20-Lead Thin Shrink Small Outline Package, JEDEC
Order Number 74LVX245MTC or 74LVX245MTCX
NS Package Number MTC20
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:
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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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National Semiconductor
National Semiconductor
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