74LCX652(2001) データシートの表示（PDF） - Fairchild Semiconductor

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74LCX652
(Rev.:2001)

Low Voltage Transceiver/Register with 5V Tolerant Inputs and Outputs

Fairchild Semiconductor 

Logic Symbols

IEEE/IEC

Truth Table

(Note 2)

Inputs

Inputs/Outputs

Operating Mode

OEAB OEBA CPAB CPBA SAB SBA A0 thru A7

B0 thru B7

L

L

H

H

H or L

H or L

X

X

X Input

X

Input

Isolation

Store A and B Data

X

H



H or L X

X Input

Not Specified Store A, Hold B

H

H





X

X Input

Output

Store A in Both Registers

L

X

H or L



X

X Not Specified Input

Hold A, Store B

L

L





X

X Output

Input

Store B in Both Registers

L

L

X

X

X

L Output

Input

Real-Time B Data to A Bus

L

L

X

H or L X

H

Store B Data to A Bus

H

H

X

X

L

X Input

Output

Real-Time A Data to B Bus

H

H

H or L

X

H

X

Stored A Data to B Bus

H

L

H or L H or L H

H Output

Output

Stored A Data to B Bus and

Stored B Data to A Bus

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

= LOW-to-HIGH Clock Transition

Note 2: The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs. Data input functions are always enabled, i.e.,

data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.

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