MC74AC646DWR2G データシートの表示（PDF） - ON Semiconductor

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MC74AC646DWR2G

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

ON Semiconductor 

MC74AC646, MC74ACT646

Octal Transceiver/Register

with 3-State Outputs

(Non-inverting)

The MC74AC646/74ACT646 consist of registered bus transceiver

circuits, with outputs, D−type flip−flops and control circuitry

providing multiplexed transmission of data directly from the input bus

or from the internal storage registers. Data on the A or B bus will be

loaded into the respective registers on the LOW−to−HIGH transition

of the appropriate clock pin (CAB or CBA). The four fundamental

data handling functions available are illustrated Figures 1 to 4.

Features

• Independent Registers for A and B Buses

• Multiplexed Real−Time and Stored Data Transfers

• Choice of True and Inverting Data Paths

• 3−State Outputs

• 300 mil Slim Dual In−Line Package

• Outputs Source/Sink 24 mA

• ′ACT646 Has TTL Compatible Inputs

• These are Pb−Free Devices

REAL TIME TRANSFER

A‐BUS TO B‐BUS

A‐BUS

REAL TIME TRANSFER

B‐BUS TO A‐BUS

A‐BUS

REG

REG

REG

REG

B‐BUS

Figure 1.

B‐BUS

Figure 2.

www.onsemi.com

MARKING DIAGRAMS

24

1

SO−24

DW SUFFIX

CASE 751E

AC646

AWLYYWWG

ACT646

AWLYYWWG

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

G = Pb−Free Package

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

STORAGE

FROM BUS TO REGISTER

A‐BUS

REG

REG

B‐BUS

Figure 3.

TRANSFER

FROM REGISTER TO BUS

A‐BUS

REG

REG

B‐BUS

Figure 4.

© Semiconductor Components Industries, LLC, 2015

1

March, 2015 − Rev. 7

Publication Order Number:

MC74AC646/D

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