MC74LVQ646DT データシートの表示（PDF） - Motorola => Freescale

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MC74LVQ646DT

Low-Voltage Quiet CMOS Octal Transceiver/Registered Transceiver (3-State, Non-Inverting)

Motorola => Freescale 

MC74LVQ646

CBA 1

DIR 3

OE 21

SBA 22

SAB 2

CAB 23

A0

LOGIC DIAGRAM

C

Q

D

C

Q

D

B0

1 of 8 Channels

To 7 Other Channels

FUNCTION TABLE

Inputs

Storage

Registers

Data

Ports

Operating Mode

OE

DIR

CAB

CBA

SAB

SBA

QA

QB

An

Bn

Operating Mode

H

X

↑

↑

Input

Input

↑

X

X

NC

NC

X

X

Isolation, Hold Storage

↑

X

X

L

X

L

H

X

H

X

L

X

X

H

X

X

Store A and/or B Data

X

L

H

L

H

↑

Input

Output

X*

L

X

NC

NC

L

NC

NC

H

L

Real Time A Data to B Bus

H

H

X

NC

NC

X

↑

X*

L

X

L

NC

L

H

NC

H

QA

Stored A Data to B Bus

L

Real Time A Data to B Bus;

H

Store A Data

H

X

L

NC

L

H

NC

H

QA

Stored A Data to B Bus;

QA

Store A Data

L

L

Output

Input

X*

↑

X

L

NC

NC

L

NC

NC

H

L

Real Time B Data to A Bus

H

X

H

NC

NC

QB

X*

↑

X

L

NC

L

L

NC

H

H

X

Stored B Data to A Bus

L

Real Time B Data to A Bus;

H

Store B Data

X

H

NC

L

QB

NC

H

QB

L

Stored B Data to A Bus;

H

Store B Data

H = High Voltage Level; L = Low Voltage Level; X = Don’t Care; ↑ = Low–to–High Clock Transition; ↑ = NOT Low–to–High Clock Transition; NC = No Change; * = The

clocks are not internally gated with either the Output Enables or the Source Inputs. Therefore, data at the A or B ports may be clocked into the storage registers, at any

time. For ICC reasons, Do Not Float Inputs.

MOTOROLA

2

LVQ DATA

BR1478

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