MC74LCX646 查看數據表（PDF） - ON Semiconductor

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MC74LCX646

Low−Voltage CMOS Octal Transceiver/Registered Transceiver

ON Semiconductor 

MC74LCX646

TRUTH TABLE

OE

DIR

Inputs

CAB

CBA

SAB

SBA

Data Ports

An

Bn

Operating Mode

H

X

↑

↑

Input

Input

↑

X

X

X

X

Isolation, Hold Storage

↑

X

X

l

h

X

X

X

Store A and/or B Data

X

l

h

L

H

↑

Input

Output

X*

L

X

L

H

L

Real Time A Data to B Bus

H

H

X

X

↑

X*

L

X

l

h

QA

Stored A Data to B Bus

L

Real Time A Data to B Bus; Store A

H

Data

H

X

L

H

QA

Clock A Data to B Bus; Store A Data

QA

L

L

Output

Input

X*

↑

X

L

L

H

L

Real Time B Data to A Bus

H

X

H

QB

X*

↑

X

L

L

H

X

Stored B Data to A Bus

l

Real Time B Data to A Bus; Store B

h

Data

X

H

QB

QB

L

Clock B Data to A Bus; Store B Data

H

H = High Voltage Level

h = High Voltage Level One Setup Time Prior to the Low−to−High Clock Transition

L = Low Voltage Level

l = Low Voltage Level One Setup Time Prior to the Low−to−High Clock Transition

X = Don’t Care

↑ = Low−to−High Clock Transition

↑ = NOT Low−to−High Clock Transition

QA = A input storage register

QB = B input storage register

* = 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.

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