SN54LVTH540, SN74LVTH540

3.3V ABT OCTAL BUFFERS/DRIVERS

WITH 3STATE OUTPUTS

SCBS681G − MARCH 1997 − REVISED OCTOBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

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.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors

with the bus-hold circuitry is not recommended.

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

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

The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,

which prevents driver conflict.

FUNCTION TABLE

INPUTS

OUTPUT

OE1

OE2

A

OUTPUT

Y

L

L

L

H

L

LH

L

H

XX

Z

X

H

X

Z

logic diagram (positive logic)

OE1

OE2

To Seven Other Channels

A1

Y1

1

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