74LCX646 データシートの表示（PDF） - Fairchild Semiconductor

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74LCX646

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

Fairchild Semiconductor 

Logic Symbols

IEEE/IEC

Truth Table

(Note 2)

OE

Inputs

Data I/O

DIR CPAB CPBA SAB SBA A0–A7 B0–B7

Function

H

X H or L H or L X

X

Isolation

H

H

 X

X

X

 X

X

X

X Input Input Clock An Data into A Register

X

Clock Bn Data into B Register

L

L

H

X

X

 H

X

L

L

X

An to Bn—Real Time (Transparent Mode)

X Input Output Clock An Data into A Register

L

L

 H H or L X

H

X

H

H

X

X

A Register to Bn (Stored Mode)

Clock An Data into A Register and Output to Bn

L

L

L

L

X

X

X

 X

X

L

Bn to An—Real Time (Transparent Mode)

L Output Input Clock Bn Data into B Register

L

L

X H or L X

H

L

L

 X

X

H

B Register to An (Stored Mode)

Clock Bn Data into B Register and Output to An

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

= LOW-to-HIGH Transition

Note 2: The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled;

i.e., data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs.

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