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DS1648DALLASN/a55avaiTRI-STATE TTL to MOS Multiplexers/Drivers


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DS1648
TRI-STATE TTL to MOS Multiplexers/Drivers
TL/F/7506
DS1648/DS3648/DS1678/DS3678
TRI-STATE
TTL
MOS
Multiplexers/Drivers
February 1986
DS1648/DS3648/DS1678/DS3678 TRI-STATEÉ TTL to
MOS Multiplexers/Drivers
General Description
The DS1648/DS3648 and DS1678/DS3678are quad 2-in-
put multiplexers with TRI-STATE outputs designedto drive
the large capacitive loads(upto 500pF) associated with
MOS memory systems.A PNP input structureis employed minimize input currentsso that driver loadingin large
memory systemsis reduced. The circuit employs Schottky-
clamped transistorsfor high speedand TRI-STATE outputs
forbus operation.
The DS1648/DS3648hasa 15X resistorin series withthe
outputsto dampen transients causedbythe fast-switching
output. The DS1678/DS3678hasa direct,low impedance
outputforuse withor withoutan external resistor.
Features TRI-STATE outputs interface directly with system-bus Schottky-clampedfor betterac performance PNP inputsto minimize input loading TTL compatible High-speed capacitive load drivers Built-in damping resistor (DS1648/DS3648 only)
Logic and Connection Diagrams
TL/F/7506–1
Dual-In-Line Package
TL/F/7506–2
TopView
Order Number DS1648J, DS3648J, DS1678J
DS3678J, DS3648Nor DS3678N
SeeNS Package NumberJ16Aor N16A
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp.
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
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