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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

OE1

OE2

To Seven Other Channels

A1

Y1

1

19

2

18

SN54LVC540A, SN74LVC540A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCAS297M – JANUARY 1993 – REVISED MAY 2005

The 3-state control gate is a 2-input AND gate with active-low inputs so that, if either output-enable (OE1 or OE2)

input is high, all outputs are in the high-impedance state.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

outputs, preventing damaging current backflow through the devices when they are powered down.

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

FUNCTION TABLE

INPUTS

OUTPUT

Y

OE1

OE2

A

L

L

L

H

L

L

H

L

H

X

X

Z

X

H

X

Z

LOGIC DIAGRAM (POSITIVE LOGIC)

2