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Электронный компонент: 74LVX245M

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TL F 11597
74LVX245
Low
Voltage
Octal
Bidirectional
Transceiver
January 1996
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 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
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 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
TSSOP
Order Number
74LVX245M
74LVX245SJ
74LVX245MTC
74LVX245MX
74LVX245SJX
74LVX245MTCX
See NS Package Number
M20B
M20D
MTC20
TRI-STATE
is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation
RRD-B30M17 Printed in U S A
http
www national com
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
http
www national com
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)
http
www national com
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) unless otherwise noted
20-Lead Small Outline Integrated Circuit (M)
Order Number 74LVX245M or 74LVX245MX
NS Package Number M20B
http
www national com
4
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Package EIAJ SOIC (SJ)
Order Number 74LVX245SJ or 74LVX245SJX
NS Package Number M20D
http
www national com
5