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1 / 11 page © Semiconductor Components Industries, LLC, 2006 March, 2006 − Rev. 6 1 Publication Order Number: MC74AC646/D 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 REAL TIME TRANSFER B-BUS TO A-BUS REG REG REG REG REG REG REG REG B-BUS B-BUS A-BUS A-BUS B-BUS B-BUS A-BUS A-BUS STORAGE FROM BUS TO REGISTER TRANSFER FROM REGISTER TO BUS Figure 1. Figure 2. Figure 3. Figure 4. http://onsemi.com MARKING DIAGRAMS Device Package Shipping ORDERING INFORMATION MC74AC646N PDIP−24 15 Units/Rail MC74AC646DW SOIC−24 30 Units/Rail MC74ACT646N PDIP−24 15 Units/Rail MC74AC646DWR 2 SOIC−24 1000 Tape & Reel MC74ACT646DW SOIC−24 30 Units/Rail MC74ACT646DWR2 SOIC−24 1000 Tape & Reel A = Assembly Location L, WL = Wafer Lot Y, YY = Year W, WW = Work Week PDIP−24 N SUFFIX CASE 724 SO−24 DW SUFFIX CASE 751E ACT646 AWLYYWW 1 24 MC74ACT646N AWLYYWW 1 24 PDIP−24 SO−24 MC74AC646N AWLYYWW AC646 AWLYYWW |
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