SN74LVT244B

3.3-V ABT OCTAL BUFFER/DRIVER

WITH 3-STATE OUTPUTS

SCAS354J − FEBRUARY 1994 − REVISED SEPTEMBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

resistor; 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 device when it is 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.

terminal assignments

1234

A

1A1

1OE

2OE

B

1A2

2A4

2Y4

1Y1

C

1A3

2Y3

2A3

1Y2

D

1A4

2A2

2Y2

1Y3

E

GND

2Y1

2A1

1Y4

FUNCTION TABLE

(each 4-bit buffer)

INPUTS

OUTPUT

OE

A

OUTPUT

Y

L

H

H

L

LL

H

X

Z

logic diagram (positive logic)

1

218

1Y1

1OE

1A1

416

1Y2

1A2

614

1Y3

1A3

812

1Y4

1A4

19

11

9

2Y1

2OE

2A1

13

7

2Y2

2A2

15

5

2Y3

2A3

17

3

2Y4

2A4

Pin numbers shown are for the DB, DW, NS, PW, and RGY packages.

GQN OR ZQN PACKAGE

(TOP VIEW)

1

234

A

B

C

D

E