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SN74AVC4T774PWRG4 数据表(PDF) 2 Page - Texas Instruments

部件名 SN74AVC4T774PWRG4
功能描述  4-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74AVC4T774PWRG4 数据表(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
DIR1
A1
OE
B1
SN74AVC4T774
SCES693B – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com
The SN74AVC4T774 is designed for asynchronous communication between data buses. The logic levels of the
direction-control (DIR) input and the output-enable (OE) input activate either the B-port outputs or the A-port
outputs or place both output ports in the high-impedance mode. The device transmits data from the A bus to the
B bus when the B outputs are activated, and from the B bus to the A bus when the A outputs are activated. The
input circuitry on both A and B ports is always active and must have a logic HIGH or LOW level applied to
prevent excess ICC and ICCZ.
The SN74AVC4T774 is designed so that the control pins (DIR1, DIR2, DIR3, DIR4, and OE) are supplied by
VCCA.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance
state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCCA through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Since this device has CMOS inputs, it is very important to not allow them to float. If the inputs are not driven to
either a high VCC state, or a low GND state, an undesirable larger than expected ICC current may result. Since
the input voltage settlement is governed by many factors (e.g. capacitance, board-layout, package inductance,
surrounding conditions, etc.), ensuring that they these inputs are kept out of erroneous switching states and tying
them to either a high or a low level minimizes the leakage-current.
ORDERING INFORMATION
TA
PACKAGE(1)(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
QFN – RGY
Tape and reel
SN74AVC4T774RGYR
WT774
QFN – RSV
Tape and reel
SN74AVC4T774RSVR
ZVK
–40
°C to 85°C
Tube
SN74AVC4T774PW
TSSOP – PW
WT774
Tape and reel
SN74AVC4T774PWR
(1)
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
FUNCTION TABLE
(Each Bit)
CONTROL INPUTS
OUTPUT CIRCUITS
OPERATION
OE
DIR
A PORT
B PORT
L
L
Enabled
Hi-Z
B data to A data
L
H
Hi-Z
Enabled
A data to B data
H
X
Hi-Z
Hi-Z
Isolation
LOGIC DIAGRAM (POSITIVE LOGIC)(1)
(1)
Shown for a single channel
2
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): SN74AVC4T774


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