74F646 データシートの表示（PDF） - Philips Electronics

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74F646

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

Philips Electronics 

Philips Semiconductors

Transceivers/registers

Product specification

74F646/A/74F648/A

The following examples demonstrate the four fundamental

bus–management functions that can be performed with the

74F646/646A and 74F648/648A. The select pins determine whether

BUS MANAGEMENT FUNCTIONS

REAL TIME BUS TRANSFER

BUS B TO BUS A

REAL TIME BUS TRANSFER

BUS A TO BUS B

data is stored or transferred through the device in real time. The

output enable pins determine the direction of the data flow.

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

OE DIR CPAB CPBA SAB SBA

LL X X X L

OE DIR CPAB CPBA SAB SBA

LH X X L X

OE DIR

XX

XX

HX

CPAB CPBA SAB

↑XX

X↑X

↑↑X

SBA

X

X

X

OE DIR CPAB CPBA SAB SBA

L L X H or L X H

L H H or L X H X

SF00392

1990 Sep 25

6

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