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

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.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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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