74ACT16646 Просмотр технического описания (PDF) - Fairchild Semiconductor

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74ACT16646

16-Bit Transceiver/Register with 3-STATE Outputs

Fairchild Semiconductor 

Function Table

Inputs

Data I/O (Note 1)

G1

DIR1 CPAB1 CPBA1 SAB1 SBA1 A0–7

B0–7

Output Operation Mode

H

H

H

X

X

X

H or L

  X

H or L

X

X

X

X

X

Isolation

X

Input Input Clock An Data into A Register

X

Clock Bn Data Into B Register

L

L

H

H

X

X

X

L

L

X

An to Bn—Real Time (Transparent Mode)

X

Input Output Clock An Data to A Register

L

L

H

H

H or L

X

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

L

L

H = HIGH Voltage Level

X

X

H or L

X

X

H

H

X = Immaterial L = LOW Voltage Level

B Register to An (Stored Mode)

Clock Bn into B Register and Output to An

 = LOW-to-HIGH Transition.

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. Also applies to data I/O (A and B: 8-15) and #2 control pins.

Real Time Transfer

A-Bus to B-Bus

Storage from

Bus to Register

Real Time Transfer

B-Bus to A-Bus

Transfer from

Register to Bus

Logic Diagram

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