LDH952A datasheet(2/14 Pages) TI1

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

SN74LVCH16952A

16-BIT REGISTERED TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS320L – NOVEMBER 1993 – REVISED MARCH 2005

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.

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 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.

FUNCTION TABLE(1)

INPUTS

OUTPUT

CEAB

CLKAB

OEAB

B0(2)

↑

(1)

A-to-B data flow is shown; B-to-A data flow is similar, but uses

CEBA, CLKBA, and OEBA.

(2)

Level of B before the indicated steady-state input conditions were

established

LDH952A Datasheet(PDF) 2 Page - Texas Instruments