MC74AC652 Просмотр технического описания (PDF) - ON Semiconductor

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MC74AC652

Octal Transceiver/Register with 3-State Outputs (Non-Inverting)

ON Semiconductor 

MC74AC652, MC74ACT652

FUNCTION TABLE

GAB

L

L

GBA

H

H

Inputs

CAB

CBA

H or L H or L

⇑

⇑

SAB

X

X

SBA

X

X

Data I/O*

A0 − A7

B0 − B7

Input

Input

Operation or Function

Isolation

Store A and B Data

X

H

⇑

H or L

X

X

H

H

⇑

⇑

X**

X

Input

Input

Unspecified* Store A, Hold B

Output Store A in Both Registers

L

X

H or L

⇑

X

X Unspecified*

Input

Hold A, Store B

L

L

⇑

⇑

X

X**

Output

Input

Store B in Both Registers

L

L

L

L

X

X

X

X

H or L

X

L

H

Output

Input

Real-Time B Data to A Bus

Stored B Data to A Bus

H

H

X

X

L

X

H

H

H or L

X

H

X

Input

Output

Real-Time A Data to B Bus

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

*The data output functions may be enabled or disabled by various signals at the GBA and GAB 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.

**Select control = L: clocks can occur simultaneously.

H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; ⇑ = LOW-to-HIGH Transition

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