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N74ALS651N

Transceiver/register

Philips Electronics 

Philips Semiconductors

Transceiver/register

BUS MANAGEMENT FUNCTIONS

The following examples demonstrate the four fundamental

bus-management functions that can be performed with the

74ALS651/74ALS651-1 and 74ALS652/74ALS652-1. The select

pins determine whether data is stored or transferred through the

device in real time. The output enable pins determine the direction of

the data flow.

REAL TIME BUS TRANSFER

BUS B TO BUS A

REAL TIME BUS TRANSFER

BUS A TO BUS B

Product specification

74ALS651/74ALS651-1

74ALS652/74ALS652-1

STORAGE FROM

A, B, OR A AND B

TRANSFER STORED DATA

TO A AND/OR B

BUS A

BUS B

BUS A

BUS B

BUS A

BUS B

BUS A

BUS B

OEABOEBA CPAB CPBA SAB SBA

L LXXXL

OEABOEBA CPAB CPBA SAB SBA

HHXX L X

OEABOEBA CPAB CPBA SAB SBA

XX↑XXX

LXX↑XX

LX↑↑XX

OEABOEBA CPAB CPBA SAB SBA

H L H or L H or L H H

SC00133

1991 Feb 08

4

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