74LVC244AD 查看數據表（PDF） - Philips Electronics

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74LVC244AD

Octal buffer/line driver with 5-volt tolerant inputs/outputs (3-State)title

Philips Electronics 

Philips Semiconductors

Octal buffer/line driver with 5-volt

tolerant inputs/outputs (3-State)

Product specification

74LVC244A

74LVCH244A

PIN DESCRIPTION

PIN NUMBER SYMBOL

FUNCTION

1

2, 4, 6, 8

3, 5, 7, 9

10

1OE

1A0 to 1A‘3

2Y0 to 2Y3

GND

Output enable input (active LOW)

Data inputs

Bus outputs

Ground (0V)

17, 15, 13, 11

18, 16, 14, 12

19

2A0 to 2A3

1Y0 to 1Y3

2OE

Bus inputs

Bus outputs

Output enable input (active-LOW)

20

VCC

Positive supply voltage

PIN CONFIGURATION

1OE 1

1A0 2

2Y0 3

1A1 4

2Y1 5

1A2 6

2Y2 7

1A3 8

2Y3 9

GND 10

20 VCC

19 2OE

18 1Y0

17 2A0

16 1Y1

15 2A1

14 1Y2

13 2A2

12 1Y3

11 2A3

SV00212

LOGIC SYMBOL (IEEE/IEC)

1

EN

2

4

6

8

19

EN

11

13

15

17

18

16

14

12

9

7

5

3

SV00209

FUNCTION TABLE

INPUTS

nOE

nAn

L

L

L

H

H

X

H = HIGH voltage level

L = LOW voltage level

X = Don’t care

Z = High impedance OFF-state

LOGIC SYMBOL

OUTPUT

nYn

L

H

Z

2

1A0

1A1 4

6

1A2

8

1A3

1OE 1

18

1Y0

16

1Y1

14

1Y2

12

1Y3

17

2A0

15

2A1

13

2A2

11

2A3

19

2OE

3

2Yo

5

2Y1

7

2Y2

9

2Y3

SV00210

FUNCTIONAL DIAGRAM

2 1A0

4 1A1

6 1A2

8 1A3

1 1OE

17 2A0

15 2A1

13 2A2

11 2A3

19 2OE

1Y0 18

1Y1 16

1Y2 14

1Y3 12

2Yo 3

2Y1 5

2Y2 7

2Y3 9

SV00211

1998 May 20

3

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