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DS1649J
Hex TRI-STATEE TTL to MOS Drivers
TL/F/7515
DS1649/DS3649/DS1679/DS3679
Hex
TRI-STATE
TTL
MOS
Drivers
March 1986
DS1649/DS3649/DS1679/DS3679 Hex TRI-STATEÉ TTL MOS Drivers
General Description
The DS1649/DS3649 and DS1679/DS3679 are Hex
TRI-STATE MOS drivers with outputs designedto drive
large capacitive loadsupto 500pF associated with MOS
memory systems. PNP input transistorsare employedtore-
duce input currents allowingthe large fan-outto these driv-
ers neededin memory systems. The circuithas Schottky-
clamped transistor logicfor minimum propagation delay,
and TRI-STATE outputsforbus operation.
The DS1649/DS3649hasa 15X resistorin series withthe
outputsto dampen transients causedbythe fast-switching
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp.
output. The DS1679/DS3679hasa directlow impedance
outputforuse withor withoutan external resistor.
Features High speed capabilities Typ9ns driving50pF Typ30ns driving500pF TRI-STATE outputsfor data bussing Built-in 15X damping resistor (DS1649/DS3649) Same pin-outas DM8096and DM74366
Schematic Diagram
*DS1649/DS3649only TL/F/7515–1
Truth Table
Disable Input Input Output
DIS1 DIS2 0 1 1 0 1 X Hi-Z 0 X Hi-Z 1 X Hi-Ze Don’tcare
Hi-Ze TRI-STATE mode
Connection Diagram
Dual-In-Line Package
TL/F/7515–2
Top View
Order Number DS1649J,DS3649J,
DS1679J,DS3679J, DS3649Nor DS3679N
SeeNS Package Number J16AorN16A
Typical Application
TL/F/7515–3
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
