參數(shù)資料
型號(hào)： LER245A
廠商： Texas Instruments, Inc.
英文描述： OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
中文描述： 八路總線收發(fā)器具有三態(tài)輸出
文件頁(yè)數(shù)： 2/21頁(yè)
文件大?。?/td> 628K
代理商： LER245A
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
This octal bus transceiver is designed for 1.65-V to 3.6-V V
CC
operation.
The SN74LVCR2245A is 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.
All outputs, which are designed to sink up to 12 mA, include equivalent 26-
resistors to reduce overshoot and
undershoot.
GQN OR ZQN PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
SN74LVCR2245A
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS581M–NOVEMBER 1996–REVISED MARCH 2005
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
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.
TERMINAL ASSIGNMENTS
1
2
3
4
A
B
C
D
E
A1
A3
A5
A7
GND
DIR
B2
A4
B6
A8
V
CC
A2
B4
A6
B8
OE
B1
B3
B5
B7
FUNCTION TABLE
INPUTS
OE
L
L
H
OPERATION
DIR
L
H
X
B data to A bus
A data to B bus
Isolation
2
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