2002 Fairchild Semiconductor Corporation
DS500428
www.fairchildsemi.com
November 2001
Revised June 2002
7
4
LCX32245 Low
V
o
lt
age 32-Bi
t Bidi
rect
io
nal T
r
ans
ceiver
wi
th 5V
T
o
l
e
rant
Input
s
an
d
Outp
uts
74LCX32245
Low Voltage 32-Bit Bidirectional Transceiver
with 5V Tolerant Inputs and Outputs
General Description
The LCX32245 contains thirty-two non-inverting bidirec-
tional buffers with 3-STATE outputs and is intended for bus
oriented applications. The device is designed for low volt-
age (2.5V or 3.3V) V
CC
applications with capability of inter-
facing to a 5V signal environment. The device is byte
controlled. Each byte has separate control inputs which
could be shorted together for full 32-bit operation. The T/R
inputs determine the direction of data flow through the
device. The OE inputs disable both the A and B ports by
placing them in a high impedance state.
The LCX32245 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
s
5V tolerant inputs and outputs
s
2.3V3.6V V
CC
specifications provided
s
4.5 ns t
PD
max (V
CC
=
3.3V), 20
A I
CC
max
s
Power down high impedance inputs and outputs
s
Supports live insertion/withdrawal (Note 1)
s
24 mA output drive (V
CC
=
3.0V)
s
Uses patented noise/EMI reduction circuitry
s
Latch-up performance exceeds 500 mA
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
s
Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to V
CC
through a pull-up resistor: the minimum value or the
resistor is determined by the current-sourcing capability of the driver.
Ordering Code:
Note 2: Ordering code "G" indicates Trays.
Note 3: Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbol
Order Number
Package Number
Package Description
74LCX32245G
(Note 2)(Note 3)
BGA96A
96-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
www.fairchildsemi.com
2
74LCX32245
Connection Diagram
(Top Thru View)
Pin Descriptions
FBGA Pin Assignments
Truth Tables
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs and I/O's may not float)
Z
=
High Impedance
Pin Names
Description
OE
n
Output Enable Input (Active LOW)
T/R
n
Transmit/Receive Input
A
0
A
31
Side A Inputs or 3-STATE Outputs
B
0
B
31
Side B Inputs or 3-STATE Outputs
1
2
3
4
5
6
A
B
1
B
0
T/R
1
OE
1
A
0
A
1
B
B
3
B
2
GND
GND
A
2
A
3
C
B
5
B
4
V
CC
V
CC
A
4
A
5
D
B
7
B
6
GND
GND
A
6
A
7
E
B
9
B
8
GND
GND
A
8
A
9
F
B
11
B
10
V
CC
V
CC
A
10
A
11
G
B
13
B
12
GND
GND
A
12
A
13
H
B
14
B
15
T/R
2
OE
2
A
15
A
14
J
B
17
B
16
T/R
3
OE
3
A
16
A
17
K
B
19
B
18
GND
GND
A
18
A
19
L
B
21
B
20
V
CC
V
CC
A
20
A
21
M
B
23
B
22
GND
GND
A
22
A
23
N
B
25
B
24
GND
GND
A
24
A
25
P
B
27
B
26
V
CC
V
CC
A
26
A
27
R
B
29
B
28
GND
GND
A
28
A
29
T
B
30
B
31
T/R
4
OE
4
A
31
A
30
Inputs
Outputs
OE
1
T/R
1
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
Inputs
Outputs
OE
2
T/R
2
L
L
Bus B
8
B
15
Data to Bus A
8
A
15
L
H
Bus A
8
A
15
Data to Bus B
8
B
15
H
X
HIGH Z State on A
8
A
15
, B
8
B
15
Inputs
Outputs
OE
3
T/R
3
L
L
Bus B
16
B
23
Data to Bus A
16
A
23
L
H
Bus A
16
A
23
Data to Bus B
16
B
23
H
X
HIGH Z State on A
16
A
23
, B
16
B
23
Inputs
Outputs
OE
4
T/R
4
L
L
Bus B
24
B
31
Data to Bus A
24
A
31
L
H
Bus A
24
A
31
Data to Bus B
24
B
31
H
X
HIGH Z State on A
24
A
31
, B
24
B
31
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4
74LCX32245
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 Ratings. The "Recom-
mended Operating Conditions" table will define the conditions for actual device operation.
Note 5: I
O
Absolute Maximum Rating must be observed.
Note 6: Unused inputs or I/O's must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
Parameter
Value
Conditions
Units
V
CC
Supply Voltage
-
0.5 to
+
7.0
V
V
I
DC Input Voltage
-
0.5 to
+
7.0
V
V
O
DC Output Voltage
-
0.5 to
+
7.0
Output in 3-STATE
V
-
0.5 to V
CC
+
0.5
Output in HIGH or LOW State (Note 5)
I
IK
DC Input Diode Current
-
50
V
I
<
GND
mA
I
OK
DC Output Diode Current
-
50
V
O
<
GND
mA
+
50
V
O
>
V
CC
I
O
DC Output Source/Sink Current
50
mA
I
CC
DC Supply Current per Supply Pin
100
mA
I
GND
DC Ground Current per Ground Pin
100
mA
T
STG
Storage Temperature
-
65 to
+
150
C
Symbol
Parameter
Min
Max
Units
V
CC
Supply Voltage
Operating
2.0
3.6
V
Data Retention
1.5
3.6
V
I
Input Voltage
0
5.5
V
V
O
Output Voltage
HIGH or LOW State
0
V
CC
V
3-STATE
0
5.5
I
OH
/I
OL
Output Current
V
CC
=
3.0V
-
3.6V
24
mA
V
CC
=
2.7V
-
3.0V
12
V
CC
=
2.3V
-
2.7V
8
T
A
Free-Air Operating Temperature
-
40
85
C
t/
V
Input Edge Rate, V
IN
=
0.8V2.0V, V
CC
=
3.0V
0
10
ns/V
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
C to
+
85
C
Units
(V)
Min
Max
V
IH
HIGH Level Input Voltage
2.3
-
2.7
1.7
V
2.7
-
3.6
2.0
V
IL
LOW Level Input Voltage
2.3
-
2.7
0.7
V
2.7
-
3.6
0.8
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.3
-
3.6
V
CC
-
0.2
V
I
OH
=
-
8 mA
2.3
1.8
I
OH
=
-
12 mA
2.7
2.2
I
OH
=
-
18 mA
3.0
2.4
I
OH
=
-
24 mA
3.0
2.2
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.3
-
3.6
0.2
V
I
OL
=
8mA
2.3
0.6
I
OL
=
12 mA
2.7
0.4
I
OL
=
16 mA
3.0
0.4
I
OL
=
24 mA
3.0
0.55
I
I
Input Leakage Current
0
V
I
5.5V
2.3
-
3.6
5.0
A
I
OZ
3-STATE I/O Leakage
0
V
O
5.5V
2.3
-
3.6
5.0
A
V
I
=
V
IH
or V
IL
I
OFF
Power-Off Leakage Current
V
I
or V
O
=
5.5V
0
10
A
5
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7
4
LCX32245
DC Electrical Characteristics
(Continued)
Note 7: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
C to
+
85
C
Units
(V)
Min
Max
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.33.6
20
A
3.6V
V
I
, V
O
5.5V (Note 7)
2.33.6
20
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.33.6
500
A
Symbol
Parameter
T
A
=
-
40
C to
+
85
C, R
L
=
500
Units
V
CC
=
3.3V
0.3V
V
CC
=
2.7V
V
CC
=
2.5V
0.2V
C
L
=
50 pF
C
L
=
50 pF
C
L
=
30 pF
Min
Max
Min
Max
Min
Max
t
PHL
Propagation Delay
1.5
4.5
1.5
5.2
1.5
5.4
ns
t
PLH
A
n
to B
n
or B
n
to A
n
1.5
4.5
1.5
5.2
1.5
5.4
t
PZL
Output Enable Time
1.5
6.5
1.5
7.2
1.5
8.5
ns
t
PZH
1.5
6.5
1.5
7.2
1.5
8.5
t
PLZ
Output Disable Time
1.5
6.4
1.5
6.9
1.5
7.7
ns
t
PHZ
1.5
6.4
1.5
6.9
1.5
7.7
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
25
C
Units
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
0.8
V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
0.6
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
-
0.8
V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
-
0.6
Symbol
Parameter
Conditions
Typical
Units
C
IN
Input Capacitance
V
CC
=
Open, V
I
=
0V or V
CC
7
pF
C
I/O
Input/Output Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
8
pF
C
PD
Power Dissipation Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10 MHz
20
pF
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