Philips Semiconductors

Product specification

74LVC544A

Octal D-type registered transceiver, inverting

(3-State)

1998 Jul 29

3

PIN DESCRIPTION

PIN NUMBER

SYMBOL

FUNCTION

1

LEBA

‘B’ to ‘A’ latch enable input (active

LOW)

2

OEBA

‘B’ to ‘A’ output enable input (active

LOW)

3, 4, 5, 6,

7, 8, 9, 10

A0–A7

‘A’ data inputs/outputs

11

EBA

‘B’ to ‘A’ enable input (active LOW)

12

GND

Ground (0V)

22, 21, 20, 19,

18, 17, 16, 15

B0–B7

‘B’ data inputs/outputs

13

OEAB

‘A’ to ‘B’ output enable input (active

LOW)

14

LEAB

‘A’ to ‘B’ latch enable input (active

LOW)

23

EAB

‘A’ to ‘B’ enable input (active LOW)

24

VCC

Positive supply voltage

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

LEBA

OEBA

A0

A1

A2

A3

A4

A5

A6

A7

EAB

VCC

EBA

B0

B1

B2

B3

B4

B6

B5

B7

LEAB

OEAB

GND

SV00733

FUNCTION TABLE

INPUTS

OUTPUTS

STATUS

OEXX

EXX

LEXX

DATA

OUTPUTS

STATUS

H

X

X

X

Z

Disabled

X

H

X

X

Z

Disabled

L

L

↑

↑

L

L

h

l

Z

Z

Disabled + Latch

L

L

L

L

↑

↑

h

l

L

H

Latch + Display

L

L

L

L

L

L

H

L

L

H

Transparent

L

L

H

X

NC

Hold

XX

= AB for A-to-B direction, BA for B-to-A direction

H

= HIGH voltage level

L

= LOW voltage level

h

= HIGH state must be present one set-up time before the LOW-to-HIGH transition of LEAB, LEBA, EAB, EBA

l

= LOW state must be present one set-up time before the LOW-to-HIGH transition of LEAB, LEBA, EAB, EBA

X

= Don’t care

↑

= LOW–to–HIGH level transition

NC

= No change

Z

= High impedance OFF-state