74LVX245 [FAIRCHILD]
Low Voltage Octal Bidirectional Transceiver; 低电压八路双向收发器
| 型号： | 74LVX245 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Low Voltage Octal Bidirectional Transceiver |
| 文件： | 总6页 (文件大小：89K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
April 1993
Revised April 2005
74LVX245
Low Voltage Octal Bidirectional Transceiver
General Description
Features
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
■ Ideal for low power/low noise 3.3V applications
■ Guaranteed simultaneous switching noise level and
dynamic threshold performance
(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.
Ordering Code
Order Number Package Number
Package Description
74LVX245M
M20B
M20D
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
74LVX245SJ
74LVX245MTC
MTC20
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
Truth Table
Pin
Inputs
Description
Outputs
Names
OE
L
T/R
L
OE
Output Enable Input
Transmit/Receive Input
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
T/R
L
H
A0–A7
B0–B7
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
H
X
H
L
HIGH Voltage Level
LOW Voltage Level
X
Immaterial
© 2005 Fairchild Semiconductor Corporation
DS011597
www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Recommended Operating
Conditions (Note 2)
Supply Voltage (VCC
DC Input Diode Current (IIK
VI 0.5V
DC Input Voltage T/R, OE (VI)
DC Diode Current (IOK
VO 0.5V
VO VCC 0.5V
)
0.5V to 7.0V
)
Supply Voltage (VCC
Input Voltage T/R, OE (VI)
Bus I/O Voltage (VI/O
)
2.0V to 3.6V
0V to 5.5V
20 mA
0.5V to 7V
)
0V to VCC
)
Operating Temperature (TA)
40 C to 85 C
0 ns/V to 100 ns/V
20 mA
20 mA
Input Rise and Fall Time ( t/ V)
DC Bus I/O Voltage (VI/O
DC Output Source
)
0.5V to VCC 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.
or Sink Current (IO)
25 mA
DC VCC or Ground Current
(ICC or IGND
)
75 mA
65 C to 150 C
180 mW
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
Storage Temperature (TSTG
Power Dissipation
)
DC Electrical Characteristics
T
25 C
Typ
T
40 C to 85 C
A
A
V
Symbol
Parameter
Units
Conditions
CC
Min
1.5
2.0
2.4
Max
Min
Max
V
V
V
V
HIGH Level
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
1.5
2.0
2.4
IH
Input
V
Voltage
LOW Level
Input
0.5
0.8
0.8
0.5
0.8
0.8
IL
V
V
Voltage
HIGH Level
Output
1.9
2.9
2.0
3.0
1.9
2.9
V
V
V
V
V
or V
or V
or V
I
50
50
A
A
OH
OL
IN
IH
IL OH
I
I
OH
OH
Voltage
2.58
2.48
4 mA
LOW Level
Output
0.0
0.0
0.1
0.1
0.1
0.1
I
50
50
A
A
IN
IH
IL OL
V
A
I
I
OL
OL
Voltage
0.36
0.25
0.44
2.5
4 mA
I
3-STATE
V
V
OZ
IN
IH
V
IL
Output
or GND
CC
OUT
Off-State Current
Input Leakage Current
Quiescent Supply Current
I
3.6
3.6
0.1
4.0
1.0
A
A
V
V
5.5V or GND
V or GND
CC
IN
IN
I
40.0
CC
IN
Noise Characteristics (Note 3)
V
T
A
25 C
Limit
Conditions
(pF)
CC
Symbol
Parameter
Quiet Output Maximum Dynamic V
Units
C
(V)
3.3
3.3
3.3
3.3
Typ
L
V
0.5
0.5
0.8
0.8
2.0
0.8
V
V
V
V
50
OLP
OLV
IHD
ILD
OL
V
Quiet Output Minimum Dynamic V
50
50
50
OL
V
V
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
Note 3: Input t
t
3 ns
r
f
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2
AC Electrical Characteristics
V
T
25 C
Typ
T
A
40 C to 85 C
CC
A
Symbol
Parameter
Units
Conditions
(V)
Min
Max
10.7
14.2
6.8
Min
Max
13.5
17.0
8.0
t
t
Propagation Delay Time
2.7
6.1
8.6
4.7
7.2
9.0
11.5
7.1
9.6
11.5
9.6
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
C
C
C
C
C
C
C
C
C
C
C
15 pF
50 pF
15 pF
50 pF
PLH
PHL
L
L
L
L
L
L
L
L
L
L
L
ns
3.3 0.3
2.7
10.1
16.9
20.4
11.0
14.5
18.0
12.8
1.5
11.5
20.5
24.0
13.0
16.5
21.0
14.5
1.5
t
t
3-STATE Output
Enable Time
15 pF, R
50 pF, R
15 pF, R
50 pF, R
50 pF, R
50 pF, R
1 k
1 k
1 k
1 k
1 k
1 k
PZL
PZH
L
L
L
L
L
L
ns
3.3 0.3
t
t
t
t
3-STATE Output
Disable Time
2.7
3.3 0.3
2.7
PLZ
ns
ns
PHZ
Output to Output Skew
(Note 4)
50 pF (Note 4)
OSLH
OSHL
3.3
1.5
1.5
Note 4: Parameter guaranteed by design. t
|t
t
|, t
|t
t
|
PHLn
OSLH
PLHm
PLHn OSHL
PHLm
Capacitance
T
25 C
T
40 C to 85 C
A
A
Symbol
Parameter
Units
Min
Typ
Max
Min
Max
C
Input Capacitance T/R, OE
4
8
10
10
pF
pF
pF
IN
C
Output Capacitance A , B
n n
I/O
PD
C
Power Dissipation Capacitance (Note 5)
21
Note 5: C is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
PD
3
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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
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4
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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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
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.
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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6
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FAIRCHILD
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