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 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)