ON Semiconductor Is Now To learn more about onsemi, please visit our website at www.onsemi.com onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba onsemi or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without notice. The information herein is provided as-is and onsemi makes no warranty, representation or guarantee regarding the accuracy of the information, product features, availability, functionality, or suitability of its products for any particular purpose, nor does onsemi assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using onsemi products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by onsemi. Typical parameters which may be provided in onsemi data sheets and/ or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. MC74AC646, MC74ACT646 Octal Transceiver/Register with 3-State Outputs (Non-inverting) The MC74AC646/74ACT646 consist of registered bus transceiver circuits, with outputs, Dtype flipflops and control circuitry www.onsemi.com 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 MARKING DIAGRAMS loaded into the respective registers on the LOWtoHIGH transition of the appropriate clock pin (CAB or CBA). The four fundamental AC646 data handling functions available are illustrated Figures 1 to 4. AWLYYWWG 24 Features 1 SO24 Independent Registers for A and B Buses ACT646 DW SUFFIX AWLYYWWG Multiplexed RealTime and Stored Data Transfers CASE 751E Choice of True and Inverting Data Paths 3State Outputs A = Assembly Location WL = Wafer Lot 300 mil Slim Dual InLine Package YY = Year Outputs Source/Sink 24 mA WW = Work Week G = PbFree Package ACT646 Has TTL Compatible Inputs These are PbFree Devices REAL TIME TRANSFER REAL TIME TRANSFER ORDERING INFORMATION ABUS TO BBUS BBUS TO ABUS See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ABUS ABUS REG REG REG REG BBUS BBUS Figure 1. Figure 2. STORAGE TRANSFER FROM BUS TO REGISTER FROM REGISTER TO BUS ABUS ABUS REG REG REG REG BBUS BBUS Figure 3. Figure 4. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: March, 2015 Rev. 7 MC74AC646/D