DS1678

DS1648 DS3648 DS1678 DS3678 TRI-STATE TTL to MOS Multiplexers Drivers February 1986 DS1648 DS3648 DS1678 DS3678 TRI-STATE TTL to MOS Multiplexers Drivers General Description The DS1648 DS3648 and DS1678 DS3678 are quad 2-input multiplexers with TRI-STATE outputs designed to drive the large capacitive loads (up to 500 pF) associated with MOS memory systems A PNP input structure is employed to minimize input currents so that driver loading in large memory systems is reduced The circuit employs Schottkyclamped transistors for high speed and TRI-STATE outputs for bus operation The DS1648 DS3648 has a 15X resistor in series with the outputs to dampen transients caused by the fast-switching output The DS1678 DS3678 has a direct low impedance output for use with or without an external resistor Features Y Y Y Y Y Y TRI-STATE outputs interface directly with system-bus Schottky-clamped for better ac performance PNP inputs to minimize input loading TTL compatible High-speed capacitive load drivers Built-in damping resistor (DS1648 DS3648 only) Logic and Connection Diagrams Dual-In-Line Package TL F 7506 – 2 Top View TL F 7506 – 1 Order Number DS1648J DS3648J DS1678J DS3678J DS3648N or DS3678N See NS Package Number J16A or N16A TRI-STATE is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation TL F 7506 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note 1) Operating Conditions Supply Voltage (VCC) Temperature (TA) DS1648 DS167...