DS1648 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – DS1648/DS3648/DS1678/DS3678 TRI-STATEÉ 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-in-
put 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 Schottky-
clamped 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 _{TRI-STATE outputs interface directly with system-bus}
Y _{Schottky-clamped for better ac performance}
Y _{PNP inputs to minimize input loading}
Y _{TTL compatible}
Y _{High-speed capacitive load drivers}
Y _{Built-in damping resistor (DS1648 DS3648 only)}
Logic and Connection Diagrams
Dual-In-Line Package
TL F 7506 1
Top View
TL F 7506 2
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