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74VCX2245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs and 26: Series
Resistors in B Outputs
June 1999
Revised April 2005
74VCX2245
Low Voltage Bidirectional Transceiver
with 3.6V Tolerant Inputs and Outputs
and 26: Series Resistors in B Outputs
General Description
The VCX2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus ori-
ented applications. The T/R input determines the direction
of data flow. The OE input disables both the A and B ports
by placing them in a high impedance state.
The 74VCX2245 is designed for low voltage (1.4V to 3.6V)
V
CC
applications with I/O compatibility up to 3.6V. The
VCX2245 is also designed with 26
:
series resistance in
the B Port outputs. This design reduces line noise in appli-
cations such as memory address drivers, clock drivers, and
bus transceivers transmitters
The 74VCX2245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main-
taining low CMOS power dissipation.
Features
s
1.4V - 3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
26
:
series resistors in B Port outputs
s
Power-off high impedance inputs and outputs
s
Supports Live Insertion and Withdrawal (Note 1)
s
t
PD
(A to B)
4.4 ns max for 3.0V to 3.6V V
CC
s
Static Drive (I
OH
/I
OL
B outputs):
r
12 mA @ 3.0V V
CC
s
Uses patented Quiet Series
¥
noise/EMI reduction
circuitry
s
Latchup performance exceeds JEDEC 78 conditions
s
ESD performance:
Human body model
!
2000V
Machine model
!
200V
s
Leadless DQFN Pb-Free 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:
Order Number
74VCX2245WM
74VCX2245BQX
(Note 2)
74VCX2245MTC
Package
Number
M20B
MLP020B
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Pb-Free 20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC
MO-241, 2.5 x 4.5mm
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.
Note 2:
DQFN package available in Tape and Reel only.
Logic Symbol
Pin Descriptions
Pin Names
OE
T/R
A
0
–A
7
B
0
–B
7
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Quiet Series
¥
is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS500170
www.fairchildsemi.com
74VCX2245
Connection Diagrams
Pin Assignments for SOIC and TSSOP
Truth Table
Inputs
OE
L
L
H
T/R
L
H
X
Bus B
0
–B
7
Data to Bus A
0
–A
7
Bus A
0
–A
7
Data to Bus B
0
–B
7
HIGH Z State on A
0
–A
7
, B
0
–B
7
(Note 3)
Outputs
H HIGH Voltage Level
L LOW Voltage Level
X Immaterial
Z High Impedance
Note 3:
Unused bus terminals during HIGH Z State must be held HIGH or
LOW.
Logic Diagram
Pad Assignments for DQFN
(Top Through View)
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2
74VCX2245
Absolute Maximum Ratings
(Note 4)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
DC Output Voltage (V
O
)
Outputs 3-STATE
Outputs Active (Note 5)
DC Input Diode Current (I
IK
) V
I
0V
DC Output Diode Current (I
OK
)
V
O
0V
V
O
!
V
CC
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or Ground Current
Storage Temperature (T
STG
)
0.5V to
4.6V
0.5V to
4.6V
0.5V to
4.6V
0.5V to V
CC
0.5V
50 mA
50 mA
50 mA
r
50 mA
r
100 mA
65
q
C to
150
q
C
Recommended Operating
Conditions
(Note 6)
Power Supply Voltage (V
CC
)
Operating
Input Voltage
Output Voltage (V
O
)
Output in Active States
Output in 3-STATE
Output Current in I
OH
/I
OL
- A Outputs
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
3.0V to 3.6V
2.3V to 2.7V
1.65V to 2.3V
1.4V to 1.65V
3.0V to 3.6V
2.3V to 2.7V
1.65V to 2.3V
1.4V to 1.65V
0V to V
CC
0V to 3.6V
1.4V to 3.6V
0.3V to 3.6V
r
24 mA
r
18 mA
r
6 mA
r
2 mA
r
12 mA
r
8 mA
r
3 mA
r
1 mA
40
q
C to
85
q
C
10 ns/V
Output Current in I
OH
/I
OL
- B Outputs
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (
'
t/
'
V)
V
IN
0.8V to 2.0V, V
CC
3.0V
Note 4:
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 5:
I
O
Absolute Maximum Rating must be observed.
Note 6:
Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics
Symbol
V
IH
Parameter
HIGH Level Input Voltage
Conditions
V
CC
(V)
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
V
IL
LOW Level Input Voltage
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
V
OH
HIGH Level Output Voltage
A Outputs
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
Min
2.0
1.6
0.65 x V
CC
0.65 x V
CC
0.8
0.7
0.35 x V
CC
0.35 x V
CC
V
CC
- 0.2
2.2
2.4
2.2
V
CC
- 0.2
2.0
1.8
1.7
V
CC
- 0.2
1.25
V
CC
- 0.2
1.05
V
V
V
Max
Units
100
P
A
12 mA
18 mA
24 mA
100
P
A
6 mA
12 mA
18 mA
100
P
A
8 mA
100
P
A
2 mA
2.7 - 3.6
2.7
3.0
3.0
2.3 - 2.7
2.3
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
3
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74VCX2245
DC Electrical Characteristics
Symbol
V
OH
Parameter
HIGH Level Output Voltage
B Outputs
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
I
OH
V
OL
LOW Level Output Voltage
A Outputs
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
V
OL
LOW Level Output Voltage
B Outputs
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
OL
I
I
I
OZ
I
OFF
I
CC
Input Leakage Current
3-STATE Output Leakage
Power Off Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
(Continued)
V
CC
(V)
2.7 - 3.6
2.7
3.0
3.0
2.3 - 2.7
2.3
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
2.7 - 3.6
2.7
3.0
3.0
2.3 - 2.7
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
2.7 - 3.6
2.7
3.0
3.0
2.7- 2.7
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
1.4 - 3.6
1.4 - 3.6
0
1.4 - 3.6
1.4 - 3.6
2.7 - 3.6
Conditions
Min
V
CC
- 0.2
2.2
2.4
2.2
V
CC
- 0.2
2.0
1.8
1.7
V
CC
- 0.2
1.25
V
CC
- 0.2
1.05
Max
Units
100
P
A
6 mA
8 mA
12 mA
100
P
A
4 mA
6 mA
8 mA
100
P
A
3 mA
100
P
A
1 mA
100
P
A
12 mA
18 mA
24 mA
100
P
A
12 mA
18 mA
100
P
A
6 mA
100
P
A
2 mA
100
P
A
6 mA
8 mA
12 mA
100
P
A
6 mA
8 mA
100
P
A
3 mA
100
P
A
1 mA
V
0.2
0.4
0.4
0.55
0.2
0.4
0.6
0.2
0.3
0.2
0.35
0.2
0.4
0.55
0.8
0.2
0.4
0.6
0.2
0.3
0.2
0.35
V
V
0
d
V
I
d
3.6V
0
d
V
O
d
3.6V
V
I
V
I
V
IH
V
IH
or V
IL
V
CC
or GND
V
CC
0.6V
0
d
(V
I
, V
O
)
d
3.6V
V
CC
d
(V
I
, V
O
)
d
3.6V (Note 7)
r
5.0
r
10
10
20
P
A
P
A
P
A
P
A
P
A
r
20
750
'
I
CC
Note 7:
Outputs disabled or 3-STATE only.
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