74ACT652 查看數據表（PDF） - Fairchild Semiconductor

零件编号

产品描述 (功能)

比赛名单

74ACT652

Transceiver/Register

Fairchild Semiconductor 

Function Table

Inputs

Inputs/Outputs (Note 1)

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

L

H

X



H or L





X

X

X Input

Output

X Not Specified Input

Store A in Both Registers

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 1: 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.

Logic Diagram

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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