The MC74AC646/74ACT646 consist of registered bus transceiver circuits,with outputs, D-type flip-flops and control circuitry providing multiplexed transmissionof data directly from the input bus or from the internal storage registers. Data on theA or B bus will be loaded into the respective registers on the LOW-to-HIGH transitionof the appropriate clock pin (CAB or CBA). The four fundamental data handlingfunctions available are illustrated in the following figures.

• 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 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.