54LVX4245
8-Bit Dual Supply Translating Transceiver with
TRI-STATE
®
Outputs
General Description
The LVX4245 is a dual-supply, 8-bit translating transceiver
that is designed to interface between a 5V bus and a 3V bus
in a mixed 3V/5V supply environment. 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 Out-
put Enable input, when HIGH, disables both A and B ports by
placing them in a TRI-STATE condition. The A port interfaces
with the 5V bus; the B port interfaces with the 3V bus.
The LVX4245 is suitable for mixed voltage applications such
as systems using 3.3V memories which must interface with
existing buses or other components operating at 5.0V.
Features
n Bidirectional interface between 5V and 3V buses
n Control inputs compatible with TTL level
n 5V data flow at A port and 3V data flow at B port
n Outputs source/sink 24 mA
n Available in Ceramic DIP and Flatpack packages
n Implements patented EMI reduction circuitry
n Functionally compatible with the 54 series 245
n Standard Microcircuit Drawing (SMD) 5962-9860601
Ordering Code
Order Number Package Number Package Description
54LVX4245J-QML J24F 24-Lead Ceramic Dual-in-line
54LVX4245W-QML W24C 24-Lead Cerpack
Logic Symbol
Pin Descriptions
Pin Names Description
OE Output Enable Input
T/R Transmit/Receive Input
A
0
–A
7
Side A Inputs or TRI-STATE Outputs
B
0
–B
7
Side B Inputs or TRI-STATE Outputs
Connection Diagram
TRI-STATE
®
is a registered trademark of National Semiconductor
DS101021-1
Pin Assignment for
CDIP and Cerpack
DS101021-2
January 1999
54L
VX4245
8-Bit
Dual
Supply
T
ranslating
T
ransceiver
with
TRI-ST
A
T
E
Outputs
© 1999 National Semiconductor Corporation DS101021 www.national.com