54LVXC3245
8-Bit Dual Supply Configurable Voltage Interface
Transceiver with TRI-STATE
Outputs
General Description
The LVXC3245 is a 24-pin dual-supply, 8-bit configurable
voltage interface transceiver suited for real time configurable
I/O applications. The V
CCA
pin accepts a 3V supply level.
The A port is a dedicated 3V port. The V
CCB
pin accepts a
3V-to-5V supply level. The B port is configured to track the
V
CCB
supply level respectively. A 5V level on the V
CC
pin will
configure the I/O pins at a 5V level and a 3V V
CC
will config-
ure the I/O pins at a 3V level. This device will allow the V
CCB
voltage source pin and I/O pins on the B port to float when
OE is HIGH. This feature is necessary to buffer data to and
from sockets that require live insertion and removal during
normal operation.
Features
n
Bidirectional interface between 3V and 3V-to-5V buses
n
Control inputs compatible with TTL level
n
Outputs source/sink up to 24 mA
n
Available in Cerpack and CDIP package
n
Implements patented EMI reduction circuitry
n
Flexible V
CCB
operating range
n
Allows B port and V
CCB
to float simultaneously when OE
is HIGH
n
Functionally compatible with the 54 series 245
n
Standard Microcircuit Drawing (SMD) 5962-9861901
Ordering Code
Order Number
Package Number
Package Description
54LVXC3245W-QML
W24A
24-Lead (0.300" Wide) Ceramic Flatpack
54LVXC3245J-QML
J24F
24-Lead Ceramic Dual-in-line
Logic Symbol
Pin Descriptions
Pin Names
Description
OE
Output Enable Input
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
Connection Diagram
TRI-STATE
is a registered trademark of National Semiconductor Corporation
DS101032-1
Pin Assignment for
CDIP and Cerpack
DS101032-2
February 1999
54L
VXC3245
8-Bit
Dual
Supply
Configurable
V
oltage
Interface
T
ransceiver
with
TRI-ST
A
T
E
Outputs
1999 National Semiconductor Corporation
DS101032
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CCA
, V
CCB
)
-0.5V to +7.0V
DC Input Voltage (V
I
)
@
OE, T/R
-0.5V to V
CCA
+0.5V
DC Input/Output Voltage (V
I/O
)
@
A
n
-0.5V to V
CCA
+0.5V
@
B
n
-0.5V to V
CCB
+0.5V
DC Input Diode Curr. (I
IK
)
@
OE,
T/R
20 mA
DC Output Diode (I
OK
)Current
50 mA
DC Output Source or Sink Current
(I
O
)
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
50 mA
and Max Current
200 mA
Storage Temperature Range (T
STG
)
-65C to +150C
Recommended Operating
Conditions
(Note 2)
Supply Voltage
V
CCA
2.7V to 3.6V
V
CCB
3.0V to 5.5V
Input Voltage (V
I
)
@
OE, T/R
0V to V
CCA
Input Output Voltage (V
I/O
)
@
A
n
0V to V
CCA
@
B
n
0V to V
CCB
Free Air Operating Temperature (T
A
)
-55C to +125C
Minimum Input Edge Rate (
V/
t)
8 ns/V
V
IN
from 30% to 70% of V
CC
V
CC
@
3.0V, 4.5V, 5.5V
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be op-
erated at these limits. The parametric values defined in the Electrical Charac-
teristics tables are not guaranteed at the absolute maximum ratings. The
"Recommended Operating Conditions" table will define the conditions for ac-
tual device operation.
Note 2: The A port unused pins (inputs or I/Os) must be held HIGH or LOW.
They may not float.
DC Electrical Characteristics
Symbol
Parameter
V
CCA
(V)
V
CCB
(V)
Units
Conditions
T
A
= -55C to
+125C
Guaranteed
Limits
V
IHA
Minimum High
A
n
,
2.7
3.0
2.0
V
V
OUT
0.1V
or
V
CC
- 0.1V
Level Input
OE
3.0
3.6
2.0
Voltage
T/R
3.6
5.5
2.0
V
IHB
B
n
2.7
3.0
2.0
3.0
3.6
2.0
3.6
5.5
3.85
V
ILA
Maximum Low
A
n
,
2.7
3.0
0.8
V
V
OUT
0.1V
or
V
CC
- 0.1V
Level Input
OE
3.0
3.6
0.8
Voltage
T/R
3.6
5.5
0.8
V
ILB
B
n
2.7
3.0
0.8
3.0
3.6
0.8
3.6
5.5
1.65
V
OHA
Minimum High Level
2.7
3.0
2.6
V
I
OH
= -100 A
Output Voltage
3.6
5.5
3.5
I
OH
= -100 A
2.7
3.0
2.2
I
OH
= -12 mA
3.0
3.0
2.4
I
OH
= -12 mA
3.0
3.0
2.2
I
OH
= -24 mA
V
OHB
2.7
3.0
2.9
V
I
OH
= -100 A
3.6
5.5
5.4
I
OH
= -100 A
2.7
3.0
2.4
I
OH
= -12 mA
3.0
3.0
2.2
I
OH
= -24 mA
3.0
4.5
3.7
I
OH
= -24 mA
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3
DC Electrical Characteristics
(Continued)
Symbol
Parameter
V
CCA
(V)
V
CCB
(V)
Units
Conditions
T
A
= -55C to
+125C
Guaranteed
Limits
V
OLA
Maximum Low Level
2.7
3.0
0.1
V
I
OL
= 100 A
Output Voltage
3.6
5.5
0.1
I
OL
= 100 A
2.7
3.0
0.3
I
OL
= 12 mA
3.0
3.0
0.3
I
OL
= 12 mA
3.0
3.0
0.4
I
OL
= 24 mA
V
OLB
2.7
3.0
0.1
V
I
OL
= 100 A
3.6
5.5
0.1
I
OL
= 100 A
2.7
3.0
0.3
I
OL
= 12 mA
3.0
3.0
0.4
I
OL
= 24 mA
3.0
4.5
0.4
I
OL
= 24 mA
I
IN
Maximum Input
3.6
3.6
1.0
A
V
I
= V
CCA
, GND
Leakage Current
@
3.6
5.5
1.0
OE , T/R
I
OZA
Maximum 3-STATE
3.6
3.6
5.0
A
V
I
= V
IL
, V
IH
,
Output Leakage
3.6
5.5
5.0
OE = V
CCA
@
A
n
V
O
= V
CCA
, GND
I
OZB
Maximum 3-STATE
3.6
3.6
5.0
A
V
I
= V
IL
, V
IH
,
Output Leakage
3.6
5.5
5.0
OE = V
CCA
@
B
n
V
O
= V
CCB
, GND
I
CC
Maximum
B
n
3.6
5.5
1.5
mA
V
I
= V
CCB
2.1V
I
CC
/Input
All
Inputs
3.6
3.6
0.5
V
I
= V
CC
0.6V
I
CCA1
Quiescent V
CCA
A
n
= V
CCA
or GND
Supply Current
3.6
Open
10
A
B
n
= Open, OE = V
CCA
,
as B Port Floats
T/R = V
CCA
, V
CCB
= Open
I
CCA2
Quiescent V
CCA
3.6
3.6
10
A
A
n
= V
CCA
or GND,
Supply Current
3.6
5.5
10
B
n
= V
CCB
or GND,
OE = GND, T/R = GND
I
CCB
Quiescent V
CCB
3.6
3.6
10
A
A
n
= V
CCA
or GND,
Supply Current
3.6
5.5
40
B
n
= V
CCB
or GND,
OE = GND, T/R = V
CCA
V
OLPA
Quiet Output
3.3
3.3
1.0
V
(Note 3)
Maximum Dynamic
3.3
5.0
1.1
V
OLPB
V
OL
3.3
3.3
0.9
V
(Note 3)
3.3
5.0
1.6
V
OLVA
Quiet Output
3.3
3.3
-0.7
V
(Note 3)
Minimum Dynamic
3.3
5.0
-0.8
V
OLVB
V
OL
3.3
3.3
-0.6
V
(Note 3)
3.3
5.0
-1.1
Note 3: Max number of outputs defined as (n). Data inputs are driven 0V to V
CC
level; one output at GND.
Note 4: Max number of Data Inputs (n) switching. (n1) inputs switching 0V to V
CC
level. Input-under-test switching: V
CC
level to threshold (V
IHD
), 0V to threshold
(V
ILD
), f = 1 MHz.
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4
AC Electrical Characteristics
Symbol
Parameter
T
A
= -55C to +125C
T
A
= -55C to +125C
Units
C
L
= 50 pF
C
L
= 50 pF
V
CCA
= 2.7V3.6V
V
CCA
= 2.7V3.6V
V
CCB
= 4.5V5.5V
V
CCB
= 3.0V3.6V
Min
Max
Min
Max
t
PHL
Propagation Delay
1.0
9.0
1.0
9.5
ns
t
PLH
A to B
1.0
9.0
1.0
9.5
t
PHL
Propagation Delay
1.0
9.0
1.0
9.0
ns
t
PLH
B to A
1.0
9.0
1.0
9.0
t
PZL
Output Enable Time
1.0
9.0
1.0
10.0
ns
t
PZH
OE to B
1.0
9.0
1.0
10.0
t
PZL
Output Enable Time
1.0
11.0
1.0
11.0
ns
t
PZH
OE to A
1.0
11.0
1.0
11.0
t
PHZ
Output Disable Time
1.0
7.5
1.0
8.0
ns
t
PLZ
OE to B
1.0
7.5
1.0
8.0
t
PHZ
Output Disable Time
1.0
7.0
1.0
7.0
ns
t
PLZ
OE to A
1.0
7.0
1.0
7.0
t
OSHL
Output to Output
t
OSLH
Skew (Note 5)
1.5
1.5
ns
Data to Output
Note 5: 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 speci-
fication applies to any outputs switching in the same direction, either HIGH to LOW (t
OSHL
) or LOW to HIGH (t
OSLH
). Parameter guaranteed by design.
Capacitance
Symbol
Parameter
Max
Units
Conditions
C
IN
Input Capacitance
10.0
pF
V
CC
= Open
C
I/O
Input/Output Capacitance
12.0
pF
V
CCA
= 3.3V
V
CCB
= 5.0V
C
PD
Power Dissipation
50
pF
V
CCB
= 5.0V
Capacitance
V
CCA
= 3.3V
Note 6: C
PD
is measured at 10 MHz.
www.national.com
5
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