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74LVCHR16245AZQLR 데이터시트(PDF) 11 Page - Texas Instruments

부품명 74LVCHR16245AZQLR
상세설명  16-Bit Bus Transceiver With 3-State Outputs
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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74LVCHR16245AZQLR 데이터시트(HTML) 11 Page - Texas Instruments

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To Seven Other Channels
1DIR
1A1
1B1
1OE
To Seven Other Channels
2DIR
2A1
2B1
2OE
SN74LVCHR16245A
www.ti.com
SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
9 Detailed Description
9.1 Overview
This 16-bit (dual-octal) noninverting bus transceiver is designed for 1.65-V to 3.6-V VCC operation.
The SN74LVCHR16245A device is designed for asynchronous communication between data buses. The control-
function implementation minimizes external-timing requirements.
This device can be used as two 8-bit transceivers or one 16-bit transceiver. It allows data transmission 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 disable the device so that the buses are effectively isolated.
All outputs, which are designed to sink up to 12 mA, include equivalent 26-
Ω series resistors to reduce overshoot
and undershoot.
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.
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.
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.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
9.2 Functional Block Diagram
Figure 4. Logic Diagram (Positive Logic)
Copyright © 1996–2014, Texas Instruments Incorporated
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Product Folder Links: SN74LVCHR16245A


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