TL/F/11540
74LVX4245
8-Bit
Dual
Supply
Translating
Transceiver
with
TRI-STATE
Outputs
October 1995
74LVX4245
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/Re-
ceive (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 both A
and B ports by placing them in a HIGH Z 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 laptop computers using 3.3V CPU’s and 5V LCD dis-
plays.
Features
Y
Bidirectional interface between 5V and 3V buses
Y
Control inputs compatible with TTL level
Y
5V data flow at A port and 3V data flow at B port
Y
Outputs source/sink 24 mA at 5V bus; 12 mA at 3V
bus
Y
Guaranteed simultaneous switching noise level and dy-
namic threshold performance
Y
Available in SOIC, QSOP and TSSOP packages
Y
Implements patented Quiet Series EMI reduction
circuitry
Y
Functionally compatible with the 74 series 245
Logic Symbol
TL/F/11540–1
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
Pin Assignment
for SOIC, QSOP and TSSOP
TL/F/11540–2
SOIC JEDEC QSOP TSSOP
Order Number 74LVX4245WM 74LVX4245QSC 74LVX4245MTC
74LVX4245WMX 74LVX4245QSCX 74LVX4245MTCX
See NS Package Number M24B MQA24 MTC24
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.