74LVX245 [NSC]
Low Voltage Octal Bidirectional Transceiver; 低电压八路双向收发器
| 型号： | 74LVX245 |
| 厂家： | 
National Semiconductor |
| 描述： | Low Voltage Octal Bidirectional Transceiver |
| 文件： | 总6页 (文件大小：133K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 1996
74LVX245
Low Voltage Octal Bidirectional Transceiver
General Description
Features
Y
Ideal for low power/low noise 3.3V applications
Available in SOIC JEDEC, SOIC EIAJ and TSSOP
packages
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.
Y
Y
Guaranteed simultaneous switching noise level and
dynamic threshold performance
Logic Symbols
Connection Diagram
Pin Assignment for
SOIC and TSSOP
TL/F/11597–1
TL/F/11597–3
TL/F/11597–5
Pin
Description
Output Enable Input
Names
OE
T/R
Transmit/Receive Input
A –A
0
B –B
Side A TRI-STATE Inputs or TRI-STATE Outputs
Side B TRI-STATE Inputs or TRI-STATE Outputs
7
7
0
Truth Table
Inputs
Outputs
OE
T/R
L
L
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
H
e
e
e
X Immaterial
H
HIGH Voltage Level
L
LOW Voltage Level
SOIC JEDEC
SOIC EIAJ
TSSOP
Order Number
74LVX245M
74LVX245SJ
74LVX245MTC
74LVX245MTCX
74LVX245MX
74LVX245SJX
See NS Package Number
M20B
M20D
MTC20
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation
TL/F/11597
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.
Recommended Operating
Conditions
Supply Voltage (V
)
CC
2.0V to 3.6V
0V to 5.5V
Input Voltage T/R, OE (V )
I
b a
0.5V to 7.0V
Supply Voltage (V
)
CC
Bus I/O Voltage (V
)
0V to V
CC
I/O
DC Input Diode Current (I
e b
)
IK
b
a
40 C to 85 C
Operating Temperature (T )
A
b
V
I
0.5V
20 mA
Input Rise and Fall Time (Dt/DV)
0 ns/V to 100 ns/V
b
DC Input Voltage T/R, OE (V )
I
0.5V to 7V
DC Diode Current (I
)
OK
e b
b
a
V
V
0.5V
a
20 mA
20 mA
O
O
e
V
CC
0.5V
b
a
DC Bus I/O Voltage (V
DC Output Source
)
0.5V to V
CC
0.5V
25 mA
75 mA
I/O
g
or Sink Current (I
)
O
DC V
or Ground Current
)
CC
(I or I
g
CC GND
b
a
65 C to 150 C
Storage Temperature (T
)
STG
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.
DC Electrical Characteristics
74LVX245
74LVX245
e
T
A
e a
Symbol
Parameter
V
Units
Conditions
T
25 C
Max
CC
A
b
a
40 C to 85 C
Min
Typ
Min
Max
V
V
V
V
High Level
Input
Voltage
2.0
3.0
3.6
1.5
2.0
2.4
1.5
2.0
2.4
IH
V
V
Low Level
Input
Voltage
2.0
3.0
3.6
0.5
0.8
0.8
0.5
0.8
0.8
IL
e
e
e
e b
e b
e b
High Level
Output
Voltage
2.0
3.0
3.0
1.9
2.9
2.0
3.0
1.9
2.9
V
V
V
V
or V
or V
or V
I
I
I
50 mA
50 mA
4 mA
OH
OL
IN
IN
IN
IH
IL
IL
IL
OH
OH
OH
V
2.58
2.48
e
e
e
Low Level
Output
Voltage
2.0
3.0
3.0
0.0
0.0
0.1
0.1
0.1
0.1
I
I
I
50 mA
IH
OL
OL
OL
V
50 mA
0.36
0.44
4 mA
g
g
I
TRI-STATE
Output
Off-State
Current
0.25
2.5
V
V
V
IH
V
OZ
e
mA
or GND
CC
OUT
3.6
e
5.5V or GND
g
g
I
I
Input
Leakage
Current
0.1
1.0
V
IN
IN
IN
3.6
3.6
mA
mA
e
Quiescent
Supply
Current
4.0
40.0
V
V
CC
or GND
CC
http://www.national.com
2
Noise Characteristics
74LVX245
V
Conditions
(pF)
CC
e
Symbol
Parameter
Units
T
25 C
Limit
0.8
A
(V)
C
L
Typ
V
OLP
V
OLV
V
IHD
V
ILD
Quiet Output Maximum Dynamic V
3.3
3.3
3.3
3.3
0.5
V
V
V
V
50
OL
b
b
0.8
Quiet Output Minimum Dynamic V
0.5
50
50
50
OL
Minimum High Level Dynamic Input Voltage
Maximum Low Level Dynamic Input Voltage
2.0
0.8
e
e
3 ns
Note: Input t
t
r
f
AC Electrical Characteristics
74LVX245
74LVX245
e
V
T
A
CC
e a
Symbol
Parameter
Units
Conditions
T
25 C
A
b
a
40 C to 85 C
(V)
Min Typ Max
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
e
e
e
e
e
e
e
e
e
e
e
t
t
Propagation Delay Time
6.1
8.6
4.7
7.2
9.0
10.7
14.2
6.8
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
15 pF
50 pF
15 pF
50 pF
PLH
2.7
PHL
ns
g
3.3 0.3
10.1
16.9
11.5
20.5
24.0
13.0
16.5
21.0
14.5
e
t
t
TRI-STATE Output
Enable Time
15 pF, R
50 pF, R
15 pF, R
50 pF, R
50 pF, R
50 pF, R
1 kX
1 kX
1 kX
1 kX
1 kX
1 kX
PZL
L
L
L
L
L
L
2.7
PZH
e
e
e
e
e
11.5 20.4
ns
7.1
9.6
11.0
14.5
g
3.3 0.3
t
t
TRI-STATE Output
Disable Time
2.7
11.5 18.0
PLZ
ns
ns
PHZ
g
3.3 0.3
9.6
12.8
1.5
t
t
Output to Output Skew
(Note 1)
50 pF (Note 1)
OSLH
2.7
1.5
OSHL
e
b
e
b
t
PHLm PHLn
Note 1: Parameter guaranteed by design. t
t
t
, t
OSHL
t
OSLH
l
PLHm
PLHn
l
l
l
Capacitance
74LVX245
74LVX245
e
T
A
e a
Symbol
Parameter
Units
T
A
25 C
b
a
40 C to 85 C
Min
Typ
4
Max
Min
Max
C
C
C
Input Capacitance T/R, OE
10
10
pF
pF
IN
Output Capacitance A , B
n
8
I/O
PD
n
Power Dissipation
21
pF
Capacitance (Note 1)
Note 1: C is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption
PD
without load.
c
c
a
I
IN CC
C
V
f
PD
CC
8 (per bit)
e
Average operating current can be obtained by the equation: I
CC(opr.)
3
http://www.national.com
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
5
http://www.national.com
Physical Dimensions All dimensions in millimeters (Continued)
20-Lead Thin Shrink Small Outline Package, JEDEC
Order Number 74LVX245MTC or 74LVX245MTCX
NS Package Number MTC20
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SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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Corporation
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Europe
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Japan Ltd.
a
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