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SN74LV245APWTG4 データシート(PDF) 2 Page - Texas Instruments

部品番号 SN74LV245APWTG4
部品情報  OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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SN74LV245APWTG4 データシート(HTML) 2 Page - Texas Instruments

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SN54LV245A, SN74LV245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS382N − SEPTEMBER 1997 − REVISED APRIL 2005
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 VCC 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 Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
terminal assignments
1234
A
A1
DIR
VCC
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)
1
234
A
B
C
D
E


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