DS1649_11 Datasheet, PDF (2/8 Pages) Texas Instruments – Hex TRI-STATE(RM) 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 output The DS1679 DS3679 has a direct low impedance
TRI-STATE MOS drivers with outputs designed to drive output for use with or without an external resistor
large capacitive loads up to 500 pF associated with MOS
memory systems PNP input transistors are employed to re- _Features
duce input currents allowing the large fan-out to these driv- _{Y High speed capabilities}
ers needed in memory systems The circuit has Schottky-
 Typ 9 ns driving 50 pF
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
Schematic Diagram
 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}
Truth Table
te Disable Input
Input Output
DIS 1 DIS 2
0
0
0
1
0
0
1
0
0
1 X Hi-Z
le¹
0 X Hi-Z
1
1 X Hi-Z
X e Don’t care
Hi-Z e TRI-STATE mode
o _{DS1649 DS3649 only}
s Connection Diagram
Ob ^{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