DS1649 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – Hex TRI-STATEE TTL to MOS Drivers

March 1986
DS1649 DS3649 DS1679 DS3679 Hex TRI-STATE TTL
to MOS Drivers
General Description
The DS1649 DS3649 and DS1679 DS3679 are Hex
TRI-STATE MOS drivers with outputs designed to drive
large capacitive loads up to 500 pF associated with MOS
memory systems PNP input transistors are employed to re-
duce input currents allowing the large fan-out to these driv-
ers needed in memory systems The circuit has Schottky-
clamped transistor logic for minimum propagation delay
and TRI-STATE outputs for bus operation
The DS1649 DS3649 has a 15X resistor in series with the
outputs to dampen transients caused by the fast-switching
TRI-STATE is a registered trademark of National Semiconductor Corp
output The DS1679 DS3679 has a direct low impedance
output for use with or without an external resistor
Features
Y _{High speed capabilities}
 Typ 9 ns driving 50 pF
 Typ 30 ns driving 500 pF
Y _{TRI-STATE outputs for data bussing}
Y _{Built-in 15X damping resistor (DS1649 DS3649)}
Y _{Same pin-out as DM8096 and DM74366}
Schematic Diagram
Truth Table
Disable Input
Input Output
DIS 1 DIS 2
0
0
0
1
0
0
1
0
0
1 X Hi-Z
1
0 X Hi-Z
1
1 X Hi-Z
X e Don’t care
Hi-Z e TRI-STATE mode
DS1649 DS3649 only
Connection Diagram
Dual-In-Line Package
TL F 7515 – 1
Typical Application
Top View
TL F 7515 – 2
Order Number DS1649J DS3649J
DS1679J DS3679J DS3649N or DS3679N
See NS Package Number J16A or N16A
C1995 National Semiconductor Corporation TL F 7515
TL F 7515 – 3
RRD-B30M105 Printed in U S A