74LVX245 Low Voltage Octal Bidirectional Transceiver
April 1993
Revised April 2005
74LVX245
Low Voltage Octal Bidirectional Transceiver
General Description
The LVX245 contains eight non-inverting bidirectional buff-
ers and 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 (active-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 impedance condi-
tion.
Features
s
Ideal for low power/low noise 3.3V applications
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
Ordering Code
Order Number
74LVX245M
74LVX245SJ
74LVX245MTC
Package Number
M20B
M20D
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbols
Connection Diagram
Pin Descriptions
Pin
Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Truth Table
Inputs
Outputs
OE
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
X
Immaterial
Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
L
L
H
H HIGH Voltage Level
L LOW Voltage Level
© 2005 Fairchild Semiconductor Corporation
DS011597
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74LVX245
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
0.5V to
7.0V
20 mA
0.5V to 7V
20 mA
20 mA
0.5V to V
CC
0.5V
r
25 mA
r
75 mA
65
q
C to
150
q
C
180 mW
Recommended Operating
Conditions
(Note 2)
Supply Voltage (V
CC
)
Input Voltage T/R, OE (V
I
)
Bus I/O Voltage (V
I/O
)
Operating Temperature (T
A
)
Input Rise and Fall Time (
'
t/
'
V)
2.0V to 3.6V
0V to 5.5V
0V to V
CC
0.5V
DC Input Voltage T/R, OE (V
I
)
DC Diode Current (I
OK
)
V
O
V
O
40
q
C to
85
q
C
0 ns/V to 100 ns/V
0.5V
V
CC
0.5V
DC Bus I/O Voltage (V
I/O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
(I
CC
or I
GND
)
Storage Temperature (T
STG
)
Power Dissipation
Note 1:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 2:
Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
V
IH
Parameter
HIGH Level
Input
Voltage
V
IL
LOW Level
Input
Voltage
V
OH
HIGH Level
Output
Voltage
V
OL
LOW Level
Output
Voltage
I
OZ
3-STATE
Output
Off-State Current
I
IN
I
CC
Input Leakage Current
Quiescent Supply Current
3.6
3.6
V
CC
2.0
3.0
3.6
2.0
3.0
3.6
2.0
3.0
3.0
2.0
3.0
3.0
3.6
1.9
2.9
2.58
0.0
0.0
0.1
0.1
0.36
2.0
3.0
T
A
Min
1.5
2.0
2.4
0.5
0.8
0.8
1.9
2.9
2.48
0.1
0.1
0.44
V
V
IN
V
25
q
C
Typ
Max
T
A
40
q
C to
85
q
C
Min
1.5
2.0
2.4
0.5
0.8
0.8
Max
Units
Conditions
V
V
V
IN
V
IH
or V
IL
I
OH
I
OH
I
OH
V
IH
or V
IL
I
OL
I
OL
I
OL
V
IH
or V
IL
V
CC
or GND
5.5V or GND
V
CC
or GND
50
P
A
50
P
A
4 mA
50
P
A
50
P
A
4 mA
r
0.25
r
2.5
P
A
V
IN
V
OUT
r
0.1
4.0
r
1.0
40.0
P
A
P
A
V
IN
V
IN
Noise Characteristics
Symbol
V
OLP
V
OLV
V
IHD
V
ILD
(Note 3)
V
CC
(V)
T
A
Typ
0.5
25
q
C
Limit
0.8
V
V
V
V
Units
Conditions
C
L
(pF)
50
50
50
50
Parameter
Quiet Output Maximum Dynamic V
OL
Quiet Output Minimum Dynamic V
OL
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
t
f
3 ns
3.3
3.3
3.3
3.3
0.5
0.8
2.0
0.8
Note 3:
Input t
r
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2
74LVX245
AC Electrical Characteristics
Symbol
t
PLH
t
PHL
3.3
r
0.3
t
PZL
t
PZH
3-STATE Output
Enable Time
3.3
r
0.3
t
PLZ
t
PHZ
t
OSLH
t
OSHL
3-STATE Output
Disable Time
Output to Output Skew
(Note 4)
2.7
3.3
r
0.3
2.7
3.3
|t
PLHm
t
PLHn
|, t
OSHL
Parameter
Propagation Delay Time
V
CC
(V)
2.7
Min
T
A
25
q
C
Typ
6.1
8.6
4.7
7.2
9.0
11.5
7.1
9.6
11.5
9.6
Max
10.7
14.2
6.8
10.1
16.9
20.4
11.0
14.5
18.0
12.8
1.5
1.5
|t
PHLm
t
PHLn
|
T
A
40
q
C to
85
q
C
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
13.5
17.0
8.0
11.5
20.5
24.0
13.0
16.5
21.0
14.5
1.5
1.5
Units
C
L
ns
C
L
C
L
C
L
C
L
ns
C
L
C
L
C
L
ns
ns
C
L
C
L
C
L
Conditions
15 pF
50 pF
15 pF
50 pF
15 pF, R
L
50 pF, R
L
15 pF, R
L
50 pF, R
L
50 pF, R
L
50 pF, R
L
1 k
:
1 k
:
1 k
:
1 k
:
1 k
:
1 k
:
2.7
50 pF (Note 4)
Note 4:
Parameter guaranteed by design. t
OSLH
Capacitance
Symbol
C
IN
C
I/O
C
PD
Parameter
Min
Input Capacitance T/R, OE
Output Capacitance A
n
, B
n
Power Dissipation Capacitance (Note 5)
T
A
25
q
C
Typ
4
8
21
Max
10
T
A
40
q
C to
85
q
C
Min
Max
10
Units
pF
pF
pF
Note 5:
C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
3
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74LVX245
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
www.fairchildsemi.com
4
74LVX245
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
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