Datasheet

SN54LV245A, SN74LV245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS382N ï SEPTEMBER 1997 ï REVISED AUGUST 2010
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
The ’LV245A devices are designed for asynchronous communication between data buses. The device
transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are
effectively isolated.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
terminal assignments
1234
A A1
DIR V
CC
OE
B A3 B2 A2 B1
C A5 A4 B4 B3
D A7 B6 A6 B5
E GND A8 B8 B7
FUNCTION TABLE
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
Pin numbers shown are for the DB, DGV, DW, FK, J, NS, PW, RGY, and W packages.
GQN PACKAGE
(TOP VIEW)
1234
A
B
C
D
E