DS1648 DS3648 DS1678 DS3678 TRI-STATE TTL to MOS Multiplexers Drivers
February 1986
DS1648 DS3648 DS1678 DS3678 TRI-ST...
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...