54AC646

www.DataSheet4U.com 54AC646 Octal Transceiver/Register with TRI-STATE Outputs August 1998 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. n n n n n n Multiplexed real-time and stored data transfers TRI-STATE outputs 300 mil slim dual-in-line package Outputs source/sink 24 mA ’ACT646 has TTL compatible inputs Standard Microcircuit Drawing (SMD) — ’AC646: 5962-89682 Features n Independent registers for A and B buses Logic Symbols Pin Names A0–A7 B0–B7 CPAB, CPBA SAB, SBA G DS100231-1 Description Data Register A Inputs Data Register A Outputs Data Register B Inputs Data Register B Outputs Clock Pulse Inputs Transmit/Receive Inputs Output Enable Input Direction Control Input DIR IEEE/IEC DS100231-2 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100231 www.national.com Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment f...