74ACQ646CW View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

74ACQ646CW

Quiet Series Octal Transceiver/Register with 3-STATE Outputs

Fairchild Semiconductor 

Logic Symbols

IEEE/IEC

Function Table

Inputs

Data I/O (Note 1)

G DIR CPAB CPBA SAB SBA A0–A7 B0–B7

Function

H

H

H

X

X

X

H or L H or L

X

 X

X

X

X

L

L

H

H

X

X

X

L

L

L

L

 H H or L X

H

X

H

H

L

L

L

L

X

X

X

X

X

L

L

L

L

 X H or L X

X

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

= LOW-to-HIGH Transition

X

Isolation

X Input Input Clock An Data into A Register

X

Clock Bn Data into B Register

X

An to Bn—Real Time (Transparent Mode)

X Input Output Clock An Data into A Register

X

A Register to Bn (Stored Mode)

X

Clock An Data into A Register and Output to Bn

L

Bn to An—Real Time (Transparent Mode)

L Output Input Clock Bn Data into B Register

H

B Register to An (Stored Mode)

H

Clock Bn Data into B Register and Output to An

Note 1: The data output functions may be enabled or disabled by various signals at the G 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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