74ABT648D データシートの表示（PDF） - Philips Electronics

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74ABT648D

Octal transceiver/register, inverting (3-State)

Philips Electronics 

Philips Semiconductors

Octal bus transceiver/register, inverting (3-State)

Product specification

74ABT648

FUNCTION TABLE

INPUTS

DATA I/O

OE

DIR

CPAB CPBA SAB SBA

An

Bn

OPERATING MODE

X

X

↑

X

X

X

Input

Unspecified

output*

Store A, B unspecified

X

X

X

↑

X

X

Unspecified

output*

Input

Store B, A unspecified

H

H

X

↑

↑

X

X

X

H or L H or L

X

X

Input

Input

Store A and B data

Isolation, hold storage

L

L

L

L

X

X

X

X

L

H or L

X

H

Output

Input

Real time B data to A bus

Stored B data to A bus

L

L

H

X

X

H

H or L

X

L

X

H

X

Input

Output

Real time A data to B bus

Stored A data to B bus

H = High voltage level

L = Low voltage level

X = Don’t care

↑ = Low-to-High clock transition

*

The data output function may be enabled or disabled by various signals at the OE input. Data input functions are always enabled, i.e.,

data at the bus pins will be stored on every Low-to-High transition of the clock.

LOGIC DIAGRAM

OE 21

DIR 3

23

CPBA

22

SBA

1

CPAB

2

SAB

4

A0

1of 8 Channels

1D

C1

Q

1D

C1

Q

20

B0

5

A1

6

A2

7

A3

8

A4

A5 9

10

A6

A7 11

1998 Jun 08

DETAIL A X 7

4

19

B1

18

B2

17

B3

16

B4

15

B5

14

B6

13

B7

SA00081

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