NSC 5962-9860501QLA, 5962-9860501QKA Datasheet
54LVX3245
8-Bit Dual Supply Translating Transceiver with
TRI-STATE
®
Outputs
General Description
The LVX3245 is a dual-supply, 8-bit translating transceiver
that is designed to interface between a 3V bus and a 5V bus
in a mixed 3V/5Vsupplyenvironment.The Transmit/Receive
(T/R) input determines the direction of data flow. Transmit
(active-HIGH) enables data from A ports to B ports; Receive
(active-LOW) enables data from B ports to A ports. The Output Enable input, when HIGH, disables bothA and B ports by
placing them in a TRI-STATE condition. TheA port interfaces
with the 3V bus; the B port interfaces with the 5V bus.
The LVX3245is suitable for mixed voltage applications such
as systems using 3.3V memories which must interface with
existing busses or other components operating at 5.0V.
Features
n Bidirectional interface between 3V and 5V buses
n Inputs compatible with TTL level
n 3V data flow at A port and 5V data flow at B port
n Outputs source/sink 24 mA
n Available in ceramic DIP and Flatpack packages
n Implements proprietary EMI reduction circuitry
n Functionally compatible with the 54 series 245
n Standard Microcircuit Drawing (SMD) 5962-9860501
Ordering Code
Order Number Package Number Package Description
54LVX3245J-QML J24F 24-Lead Ceramic Dual-in-line
54LVX3245W-QML W24C 24-Lead Cerpack
Logic Symbol Connection Diagram
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS101018-1
Pin Assignment
for CDIP and Cerpack
DS101018-2
January 1999
54LVX3245 8-Bit Dual Supply Translating Transceiver with TRI-STATE Outputs
© 1999 National Semiconductor Corporation DS101018 www.national.com
Pin Descriptions
Pin Names Description
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0–A7
Side A Inputs or TRI-STATE Outputs
B
0–B7
Side B Inputs or TRI-STATE Outputs
Truth Table
Inputs Outputs
OE
T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
H=High Voltage Level
L=Low Voltage Level
I=Immaterial
Logic Diagram
DS101018-4
www.national.com 2
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,VCCB
) −0.5V to +7.0V
DC Input Voltage (V
I
)@OE, T/R −0.5V to V
CCB
+ 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 Current (I
IN
)
@
OE , T/R
±
20 mA
DC Output Diode Current (I
OK
)
±
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
@
I
CCA
±
200 mA
@
I
CCB
±
200 mA
Storage Temperature Range
(T
STG
) −65˚C to +150˚C
Recommended Operating
Conditions
(Note 2)
Supply Voltage
V
CCA
2.7V to 3.6V
V
CCB
4.5V to 5.5V
Input Voltage (V
I
)@OE , T/R 0V to V
CCB
Input/Output Voltage (V
I/O
)
@
A(n) 0V to V
CCA
@
B(n) 0V to V
CCB
Free Air Operating Temperature (TA) −55˚C to +125˚C
Minimum Input Edge Rate (∆t/∆V) 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 operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The
“Recommended Operating Conditions” table will define the conditions for actual device operation.
Note 2: Unused Pins (inputs and I/Os) must be held HIGH or LOW. They
may not float.
DC Electrical Characteristics
Symbol Parameter
V
CCA
(V)
V
CCB
(V)
T
A
=
−55˚C to +125˚C
Units Conditions
Guaranteed Limits
V
IHA
Minimum High
Level Input
Voltage
A(n), T/R,
3.6 5.0 2.0 V V
OUT
≤ 0.1V or
≥ V
CC
− 0.1V
OE
2.7 5.0 2.0
V
IHB
B(n) 3.3 4.5 2.0
3.3 5.5 2.0
V
ILA
Maximum Low
Level
Input Voltage
A(n), T/R,
3.6 5.0 0.8 V V
OUT
≤ 0.1V or
≥ V
CC
−0.1V
OE
2.7 5.0 0.8
V
ILB
B(n) 3.3 4.5 0.8
3.3 5.5 0.8
V
OHA
Minimum High Level 2.7 4.5 2.6 V I
OH
=
−100 µA
Output Voltage 3.6 5.5 3.5 I
OH
=
−100 µA
2.7 4.5 2.2 I
OH
=
−12 mA
3.0 4.5 2.4 I
OH
=
−12 mA
3.0 4.5 2.2 I
OH
=
−24 mA
V
OHB
2.7 4.5 4.4 V I
OH
=
−100 µA
3.6 5.5 5.4 I
OH
=
−100 µA
3.0 4.5 3.7 I
OH
=
−24 mA
V
OLA
Maximum Low Level 2.7 4.5 0.1 V I
OL
=
100 µA
Output Voltage 3.6 5.5 0.1 I
OL
=
100 µA
2.7 4.5 0.4 I
OL
=
12 mA
3.0 4.5 0.3 I
OL
=
12 mA
3.0 4.5 0.4 I
OL
=
24 mA
V
OLB
2.7 4.5 0.1 V I
OL
=
100 µA
3.6 5.5 0.1 I
OL
=
100 µA
3.0 4.5 0.4 I
OL
=
24 mA
www.national.com3
Loading...