Philips Semiconductors

Product specification

74F543, 74F544

Octal registered transceivers

1994 Dec 5

4

PIN CONFIGURATION – 74F544

24

23

22

21

20

19

18

17

16

15

14

13

12

10

11

9

8

7

6

5

4

3

2

1

VCC

B0

B1

B2

B3

B4

B5

B6

B7

A0

A1

A2

A3

A4

A5

A6

A7

LEBA

OEBA

EAB

LEAB

OEAB

EBA

GND

SF00240

LOGIC SYMBOL (IEEE/IEC) – 74F544

13

2

11

1

23

14

IEN3

G1

1C5

2EN4

G2

2C6

35D

4

6D

3

4

5

6

7

8

9

10

22

21

20

19

18

17

16

15

SF00241

LOGIC SYMBOL – 74F544

11

23

14

1

EAB

EBA

LEAB

LEBA

VCC = Pin 24

A0 A1 A2 A3 A4 A5 A6 A7

B0 B1 B2 B3 B4 B5 B6 B7

13

2

22 21 20 19 18 17 16 15

34

56789

10

SF00242

GND = Pin 12

OEAB

OEBA

FUNCTION TABLE for 74F543 and 74F544

INPUTS

OUTPUTS

STATUS

OEXX

EXX

LEXX

DATA

74F543

74F544

H

X

X

X

Z

Z

Disabled

X

H

X

X

Z

Z

Disabled

L

↑

L

h

Z

Z

Disable +

L

↑

L

l

Z

Z

Disable +

Latch

L

L

↑

h

H

L

Latch +

L

L

↑

l

L

H

Latch +

Display

L

L

L

H

H

L

Transparent

L

L

L

L

L

H

Transparent

L

L

H

X

NC

NC

Hold

H

= High voltage level

L

= Low voltage level

h

= High state must be present one setup time before the

Low-to-High transition of LEXX or EXX (XX=AB or BA)

l

= Low state must be present one setup time before the

Low-to-High transition of LEXX or EXX (XX=AB or BA)

↑ = Low-to-High transition of LEXX or EXX XX = AB or BA

X

= Don’t care

NC = No change

Z

= High impedance “off” state