Philips Semiconductors

Product specification

74F455,* 74F456

Buffers/Drivers

1999 Jan 08

3

* Discontinued part. Please see the Discontinued Products List.

LOGIC SYMBOL – 74F455

D0

D1

D2

D3

D4

D5

D6

D7

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

OE0

OE1

PI

ΣE

ΣO

4

5689

10

11

12

23

24

1

2

3

22

21

20

17

16

15

14

13

SF00959

GND = Pin 18, 19

LOGIC SYMBOL (IEEE/IEC) – 74F455

SF00961

4

6

8

9

3,5,6,7,8

9,10,11,12

1

2

2K

21

20

17

Z6

5

22

10

11

12

15

14

13

16

4

24

23

3

Z5

Z8

Z7

Z9

Z11

Z10

Z12

w1

EN4

P3

3,5,6,7,8

9,10,11,12

[EVEN]

[ODD]

LOGIC SYMBOL – 74F456

D0

D1

D2

D3

D4

D5

D6

D7

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

OE0

OE1

PI

ΣE

ΣO

4

5689

10

11

12

23

24

1

2

3

22

21

20

17

16

15

14

13

SF00960

GND = Pin 18, 19

LOGIC SYMBOL (IEEE/IEC) – 74F456

SF00962

4

6

8

9

3,5,6,7,8

9,10,11,12

1

2

2K

21

20

17

Z6

5

22

10

11

12

15

14

13

16

4

24

23

3

Z5

Z8

Z7

Z9

Z11

Z10

Z12

­1

EN4

P3

3,5,6,7,8

9,10,11,12

[EVEN]

[ODD]

FUNCTION TABLE

INPUTS

OUTPUTS

74F455

74F456

OE0

OE1

Dn

Qn

Qn

L

L

L

H

L

L

L

H

L

H

H

X

X

Z

Z

X

H

X

Z

Z

H = High voltage level

L

= Low voltage level

Z = High impedance “off” state

X = Don’t care

FUNCTION TABLE for PARITY OUTPUTS

INPUTS

OUTPUTS

Number of inputs, High (PI, D0 - D7)

ΣE

ΣO

Even - 0, 2, 4, 6, 8

H

L

Odd - 1, 3, 5, 7, 9

L

H

Any OEn = High

Z

Z

H = High voltage level

L

= Low voltage level

Z = High impedance “off” state

X = Don’t care