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54AC646F Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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54AC646F Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page 54AC646 Octal Transceiver/Register with TRI-STATE® Outputs General Description The ’AC646 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 (CPAB or CPBA). The four fundamental data handling functions available are illustrated in Figures 1, 2, 3, 4. Features n Independent registers for A and B buses n Multiplexed real-time and stored data transfers n TRI-STATE outputs n 300 mil slim dual-in-line package n Outputs source/sink 24 mA n ’ACT646 has TTL compatible inputs n Standard Microcircuit Drawing (SMD) — ’AC646: 5962-89682 Logic Symbols Pin Names Description A 0–A7 Data Register A Inputs Data Register A Outputs B 0–B7 Data Register B Inputs Data Register B Outputs CPAB, CPBA Clock Pulse Inputs SAB, SBA Transmit/Receive Inputs G Output Enable Input DIR Direction Control Input TRI-STATE® is a registered trademark of National Semiconductor Corporation. FACT® is a registered trademark of Fairchild Semiconductor Corporation. DS100231-1 IEEE/IEC DS100231-2 August 1998 © 1998 National Semiconductor Corporation DS100231 www.national.com |
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