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Электронный компонент: 74VCX245WMX

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2004 Fairchild Semiconductor Corporation
ds500167
www.fairchildsemi.com
June 1999
Revised March 2004
7
4
VC
X24
5
Low
V
o
l
t
a
g
e Bi
dir
ecti
onal
T
r
anscei
ver
wit
h
3.
6V T
o
l
e
ra
nt
Input
s
and Out
puts
74VCX245
Low Voltage Bidirectional Transceiver
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX245 contains eight non-inverting bidirectional buff-
ers with 3-STATE outputs and is intended for bus oriented
applications. The T/R input determines the direction of data
flow. The OE input disables both the A and B ports by plac-
ing them in a high impedance state.
The 74VCX245 is designed for low voltage (1.4V to 3.6V)
V
CC
applications with I/O compatibility up to 3.6V.
The 74VCX245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main-
taining low CMOS power dissipation.
Features
s
1.4V to 3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
Power-off high impedance inputs and outputs
s
Supports Live Insertion and Withdrawal (Note 1)
s
t
PD
3.5 ns max for 3.0V to 3.6V V
CC
s
Static Drive (I
OH
/I
OL
)
24 mA @ 3.0V V
CC
s
Uses patented noise/EMI reduction
circuitry
s
Latchup performance exceeds 300 mA
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
s
Leadless DQFN package
Note 1: To ensure the high impedance state during power up and power
down, OE
n
should be tied to V
CC
through a pull up resistor. The minimum
value of the resistor is determined by the current sourcing capability of the
driver.
Ordering Code:
Note 2: Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Note 3: DQFN package available in Tape and Reel only,
Logic Symbol
Pin Descriptions
Order Number
Package
Number
Package Description
74VCX245WM
(Note 2)
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74VCX245BQX
(Note 3)
MLP020B
20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241,
2.5 x 4.5mm
74VCX245MTC
(Note 2)
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names
Description
OE
Output Enable Input (Active LOW)
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
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2
74
V
CX245
Connection Diagrams
Pin Assignments for SOIC and TSSOP
Pin Assignment for DQFN
(Top Through View)
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
Note 4: Unused bus terminals during HIGH Z State must be held HIGH or
LOW.
Logic Diagram
Inputs
Outputs
OE
T/R
L
L
Bus B
0
B
7
Data to Bus A
0
A
7
L
H
Bus A
0
A
7
Data to Bus B
0
B
7
H
X
HIGH Z State on A
0
A
7
, B
0
B
7
(Note 4)
3
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7
4
VC
X24
5
Absolute Maximum Ratings
(Note 5)
Recommended Operating
Conditions
(Note 7)
Note 5: 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 Rat-
ings. The "Recommended Operating Conditions" table will define the condi-
tions for actual device operation.
Note 6: I
O
Absolute Maximum Rating must be observed.
Note 7: Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics
Supply Voltage (V
CC
)
-
0.5V to
+
4.6V
DC Input Voltage (V
I
)
-
0.5V to
+
4.6V
DC Output Voltage (V
O
)
Outputs 3-STATE
-
0.5V to
+
4.6V
Outputs Active (Note 6)
-
0.5V to V
CC
+
0.5V
DC Input Diode Current (I
IK
) V
I
<
0V
-
50 mA
DC Output Diode Current (I
OK
)
V
O
<
0V
-
50 mA
V
O
>
V
CC
+
50 mA
DC Output Source/Sink Current
(I
OH
/I
OL
)
50 mA
DC V
CC
or Ground Current
100 mA
Storage Temperature (T
STG
)
-
65
C to
+
150
C
Power Supply
Operating
1.4V to 3.6V
Input Voltage
-
0.3V to 3.6V
Output Voltage (V
O
)
Output in Active States
0V to V
CC
Output in 3-STATE
0V to 3.6V
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
24 mA
V
CC
=
2.3V to 2.7V
18 mA
V
CC
=
1.65V to 2.3V
6 mA
V
CC
=
1.4V to 1.6V
2 mA
Free Air Operating Temperature (T
A
)
-
40
C to
+
85
C
Minimum Input Edge Rate (
t/
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/V
Symbol
Parameter
Conditions
V
CC
Min
Max
Units
(V)
V
IH
HIGH Level Input Voltage
2.7 to 3.6
2.0
V
2.3 to 2.7
1.6
1.65 to 2.3
0.65
V
CC
1.4 to 1.6
0.65
V
CC
V
IL
LOW Level Input Voltage
2.7 to 3.6
0.8
V
2.3 to 2.7
0.7
1.65 to 2.3
0.35
V
CC
1.4 to 1.6
0.35
V
CC
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.7 to 3.6
V
CC
-
0.2
V
I
OH
=
-
12 mA
2.7
2.2
I
OH
=
-
18 mA
3.0
2.4
I
OH
=
-
24 mA
3.0
2.2
I
OH
=
-
100
A
2.3 to 2.7
V
CC
-
0.2
I
OH
=
-
6 mA
2.3
2.0
I
OH
=
-
12 mA
2.3
1.8
I
OH
=
-
18 mA
2.3
1.7
I
OH
=
-
100
A
1.65 to 2.3
V
CC
-
0.2
I
OH
=
-
6 mA
1.65
1.25
I
OH
=
-
100
A
1.4 to 1.6
V
CC
-
0.2
I
OH
=
-
2 mA
1.4
1.05
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4
74
V
CX245
DC Electrical Characteristics
(Continued)
Note 8: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
(Note 9)
Note 9: For C
L
=
50
P
F, add approximately 300 ps to the AC maximum specification.
Note 10: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
Symbol
Parameter
Conditions
V
CC
Min
Max
Units
(V)
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.7 to 3.6
0.2
V
I
OL
=
12 mA
2.7
0.4
I
OL
=
18 mA
3.0
0.4
I
OL
=
24 mA
3.0
0.55
I
OL
=
100
A
2.3 to 2.7
0.2
I
OL
=
12 mA
2.3
0.4
I
OL
=
18 mA
2.3
0.6
I
OL
=
100
A
1.65 to 2.3
0.2
I
OL
=
6 mA
1.65
0.3
I
OL
=
100
A
1.4 to 1.6
0.2
I
OL
=
2 mA
1.4
0.35
I
I
Input Leakage Current
0
V
I
3.6V
1.4 to 3.6
5.0
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
1.4 to 3.6
10
A
V
I
=
V
IH
or V
IL
I
OFF
I
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
1.4 to 3.6
20
A
V
CC
(V
I
, V
O
)
3.6V (Note 8)
1.4 to 3.6
20
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.7 to 3.6
750
A
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
C to
+
85
C
Units
Figure
(V)
Min
Max
Number
t
PHL
, t
PLH
Propagation Delay
C
L
=
30 pF, R
L
=
500
3.3
0.3
0.6
3.5
ns
Figures
1, 2
A
n
to B
n
or B
n
to A
n
2.5
0.2
0.8
4.2
1.8
0.15
1.5
8.4
C
L
=
15 pF, R
L
=
2k
1.5
0.1
1.0
16.8
Figures
5, 6
t
PZL
, t
PZH
Output Enable Time
C
L
=
30 pF, R
L
=
500
3.3
0.3
0.6
4.5
ns
Figures
1, 3, 4
2.5
0.2
0.8
5.6
1.8
0.15
1.5
9.8
C
L
=
15 pF, R
L
=
2k
1.5
0.1
1.0
19.6
Figures
5, 7, 8
t
PLZ
, t
PHZ
Output Disable Time
C
L
=
30 pF, R
L
=
500
3.3
0.3
0.6
3.6
ns
Figures
1, 3, 4
2.5
0.2
0.8
4.0
1.8
0.15
1.5
7.2
C
L
=
15 pF, R
L
=
2k
1.5
0.1
1.0
14.4
Figures
5, 7, 8
t
OSHL
Output to Output Skew
C
L
=
30 pF, R
L
=
500
3.3
0.3
0.5
ns
t
OSLH
(Note 10)
2.5
0.2
0.5
1.8
0.15
0.75
C
L
=
15 pF, R
L
=
2k
1.5
0.1
1.5
5
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7
4
VC
X24
5
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
25
C
Units
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
0.3
V
2.5
0.7
3.3
1.0
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
-
0.3
V
2.5
-
0.7
3.3
-
1.0
V
OHV
Quiet Output Dynamic Valley V
OH
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
1.3
V
2.5
1.7
3.3
2.0
Symbol
Parameter
Conditions
T
A
=
+
25
C
Units
Typical
C
IN
Input Capacitance
V
I
=
0V or V
CC
, V
CC
=
1.8V, 2.5V or 3.3V
6.0
pF
C
I/O
Input/Output Capacitance
V
I
=
0V or V
CC
, V
CC
=
1.8V, 2.5V or 3.3V
7.0
pF
C
PD
Power Dissipation Capacitance
V
I
=
0V or V
CC
, f
=
10 MHz, V
CC
=
1.8V, 2.5V or 3.3V
20.0
pF