1998 Sep 30

3

Philips Semiconductors

Product specification

Quad 2-input multiplexer; 3-state

74HC/HCT257

ORDERING INFORMATION

PIN DESCRIPTION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

74HC257N;

74HCT257N

DIP16

plastic dual in-line package; 16 leads (300 mil); long body

SOT38-1

74HC257D;

74HCT257D

SO16

plastic small outline package; 16 leads; body width 3.9 mm

SOT109-1

74HC257DB;

74HCT257DB

SSOP16

plastic shrink small outline package; 16 leads; body width 5.3 mm

SOT338-1

74HC257PW;

74HCT257PW

TSSOP16

plastic thin shrink small outline package; 16 leads; body width 4.4 mm

SOT403-1

PIN NO.

SYMBOL

NAME AND FUNCTION

1

S

common data select input

2, 5, 11, 14

data inputs from source 0

3, 6, 10, 13

data inputs from source 1

4, 7, 9, 12

1Y to 4Y

3-state multiplexer outputs

8

GND

ground (0 V)

15

OE

3-state output enable input (active LOW)

16

positive supply voltage

Fig.1 Pin configuration.

fpage

GND

VCC

MLB311

S

OE

1Y

2Y

4Y

3Y

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

257

1I0

1I1

2I0

2I1

4I0

4I1

3I0

3I1

Fig.2 Logic symbol.

fpage

MGA835

S

OE

1Y

2Y

3Y

4Y

2

3

5

6

11

10

14

13

15

1

4

7

9

12

1I0

1I1

2I0

2I1

3I0

3I1

4I0

4I1

Fig.3 IEC logic symbol.