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74LVX245 Low Voltage Octal Bidirectional Transceiver
April 1993
Revised March 1999
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
n
Ideal for low power/low noise 3.3V applications
n
Guaranteed simultaneous switching noise level and
dynamic threshold performance
Ordering Code
Order Number Package Number
Package Description
74LVX245M
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVX245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LVX245MTC
MTC20
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.
Logic Symbols
Connection Diagram
Pin Descriptions
Truth Table
Pin
Description
Inputs
Outputs
Names
OE Output Enable Input
T/R Transmit/Receive Input
A 0 –A 7 Side A Inputs or 3-STATE Outputs
B 0 –B 7 Side B Inputs or 3-STATE 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
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
© 1999 Fairchild Semiconductor Corporation
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Absolute Maximum Ratings (Note 1)
Recommended Operating
Conditions (Note 2)
Supply Voltage (V CC )
- 0.5V to + 7.0V
DC Input Diode Current (I IK )
V I = - 0.5V
Supply Voltage (V CC )
2.0V to 3.6V
- 20 mA
Input Voltage T/R, OE (V I )
0V to 5.5V
DC Input Voltage T/R, OE (V I )
- 0.5V to 7V
Bus I/O Voltage (V I/O )
0V to V CC
DC Diode Current (I OK )
V O = - 0.5V
Operating Temperature (T A )
- 40 ° C to + 85 ° C
- 20 mA
Input Rise and Fall Time ( D t/ D V)
0 ns/V to 100 ns/V
V O = V CC + 0.5V
+ 20 mA
DC Bus I/O Voltage (V I/O )
- 0.5V to V CC + 0.5V
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 Output Source
or Sink Current (I O )
± 25 mA
DC V CC or Ground Current
(I CC or I GND )
± 75 mA
Storage Temperature (T STG )
- 65 ° C to + 150 ° C
Power Dissipation
180 mW
DC Electrical Characteristics
T A
=
+
25
°
C
T A
=
-
40
C to
+
85
C
V CC
Symbol
Parameter
Units
Conditions
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
=
V IH or V IL I OH
=
-
50
m
A
Output
3.0
2.9
3.0
2.9
V
I OH
=
-
50
m
A
Voltage
3.0
2.58
2.48
I OH
=
-
4 mA
V OL
LOW Level
2.0
0.0
0.1
0.1
V IN
=
V IH or V IL I OL
=
50
m
A
Output
3.0
0.0
0.1
0.1
V
I OL
=
50
m
A
Voltage
3.0
0.36
0.44
I OL
=
4 mA
I OZ
3-STATE
3.6
±
0.25
±
2.5
m
A IN
=
V IH or V IL
Output
V OUT
=
V CC or GND
Off-State Current
I IN
Input Leakage Current
3.6
±
0.1
±
1.0
m
A IN
=
5.5V or GND
I CC
Quiescent Supply Current
3.6
4.0
40.0
m
A IN
=
V CC or GND
Noise Characteristics (Note 3)
V CC
(V)
T A
=
25
C
Conditions
C L (pF)
Symbol
Parameter
Units
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
-
0.5
-
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 3: Input t r
=
t f
=
3 ns
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2
°
°
°
199583885.002.png
AC Electrical Characteristics
V CC
(V)
T A
=
+
25
°
C
T A
=-
40
C to
+
85
°
C
Symbol
Parameter
Units
Conditions
Min
Typ
Max
Min
Max
t PLH
Propagation Delay Time
2.7
6.1
10.7
1.0
13.5
C L
=
15 pF
t PHL
8.6
14.2
1.0
17.0
C L
=
50 pF
ns
3.3
±
0.3
4.7
6.8
1.0
8.0
C L
=
15 pF
7.2
10.1
1.0
11.5
C L
=
50 pF
t PZL
3-STATE Output
2.7
9.0
16.9
1.0
20.5
C L
=
15 pF, R L
=
1 k
W
t PZH
Enable Time
11.5
20.4
1.0
24.0
C L
=
50 pF, R L
=
1 k
W
ns
3.3
±
0.3
7.1
11.0
1.0
13.0
C L
=
15 pF, R L
=
1 k
W
9.6
14.5
1.0
16.5
C L
=
50 pF, R L
=
1 k
W
t PLZ
3-STATE Output
2.7
11.5
18.0
1.0
21.0
C L
=
50 pF, R L
=
1 k
W
ns
t PHZ
Disable Time
3.3
±
0.3
9.6
12.8
1.0
14.5
C L
=
50 pF, R L
=
1 k
W
t OSLH
Output to Output Skew
2.7
1.5
1.5
C L
=
50 pF (Note 4)
ns
t OSHL
(Note 4)
3.3
1.5
1.5
Note 4: Parameter guaranteed by design. t OSLH
=
|t PLHm
-
t PLHn |, t OSHL
=
|t PHLm
-
t PHLn |
Capacitance
T A = + 25 ° C
T A = - 40 ° C to + 85 ° C
Symbol
Parameter
Units
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 Capacitance (Note 5)
21
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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°
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Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
Package Number M20B
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
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4
199583885.004.png
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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