2005 Fairchild Semiconductor Corporation
DS500170
www.fairchildsemi.com
June 1999
Revised April 2005
7
4
VC
X22
45
Low V
o
lt
age Bidi
rec
t
i
onal T
r
an
sceive
r w
i
th 3.
6V
T
o
l
e
rant
I
nput
s and
Out
put
s and
2
6
:
Seri
es
Res
i
st
ors in B
Out
put
s
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:
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
Quiet Series
is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package
Number
Package Description
74VCX2245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74VCX2245BQX
(Note 2)
MLP020B
Pb-Free 20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC
MO-241, 2.5 x 4.5mm
74VCX2245MTC
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
3
www.fairchildsemi.com
7
4
VC
X22
4
5
Absolute Maximum Ratings
(Note 4)
Recommended Operating
Conditions
(Note 6)
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
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 5)
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
r
50 mA
(I
OH
/I
OL
)
DC V
CC
or Ground Current
r
100 mA
Storage Temperature (T
STG
)
65
q
C to
150
q
C
Power Supply Voltage (V
CC
)
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
- A Outputs
V
CC
3.0V to 3.6V
r
24 mA
V
CC
2.3V to 2.7V
r
18 mA
V
CC
1.65V to 2.3V
r
6 mA
V
CC
1.4V to 1.65V
r
2 mA
Output Current in I
OH
/I
OL
- B Outputs
V
CC
3.0V to 3.6V
r
12 mA
V
CC
2.3V to 2.7V
r
8 mA
V
CC
1.65V to 2.3V
r
3 mA
V
CC
1.4V to 1.65V
r
1 mA
Free Air Operating Temperature (T
A
)
40
q
C to
85
q
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 - 3.6
2.0
V
2.3 - 2.7
1.6
1.65 - 2.3
0.65 x V
CC
1.4 - 1.6
0.65 x V
CC
V
IL
LOW Level Input Voltage
2.7 - 3.6
0.8
V
2.3 - 2.7
0.7
1.65 - 2.3
0.35 x V
CC
1.4 - 1.6
0.35 x V
CC
V
OH
HIGH Level Output Voltage
I
OH
100
P
A
2.7 - 3.6
V
CC
- 0.2
V
A Outputs
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
P
A
2.3 - 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
P
A
1.65 - 2.3
V
CC
- 0.2
I
OH
8 mA
1.65
1.25
I
OH
100
P
A
1.4 - 1.6
V
CC
- 0.2
I
OH
2 mA
1.4
1.05
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