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