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MC74AC646

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.

• 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

w These devices are available in Pb−free package(s). Specifications herein

apply to both standard and Pb−free devices. Please see our website at

www.onsemi.com for specific Pb−free orderable part numbers, or

contact your local ON Semiconductor sales office or representative.

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.

http://onsemi.com

24

1

24

1

PDIP−24

N SUFFIX

CASE 724

SO−24

DW SUFFIX

CASE 751E

MARKING DIAGRAMS

PDIP−24

MC74AC646N

AWLYYWW

MC74ACT646N

AWLYYWW

SO−24

AC646

AWLYYWW

ACT646

AWLYYWW

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.

A

= Assembly

Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

ORDERING INFORMATION

Device

Package Shipping

MC74AC646N

PDIP−24 15 Units/Rail

MC74ACT646N

PDIP−24 15 Units/Rail

MC74AC646DW

MC74AC646DWR

2

MC74ACT646DW

SOIC−24 30 Units/Rail

SOIC−24 1000 Tape & Reel

SOIC−24 30 Units/Rail

MC74ACT646DWR2 SOIC−24 1000 Tape & Reel

© Semiconductor Components Industries, LLC, 2006

1

March, 2006 − Rev. 6

Publication Order Number:

MC74AC646/D

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