February 1986
DS1628/DS3628 Octal TRI-STATE MOS Drivers
É
Features
General Description
The DS1628/DS3628 are octal Schottky memory drivers
with TRI-STATE outputs designed to drive high capacitive
loads associated with MOS memory systems. The drivers’
Y
High speed capabilities
Ð Typical 5 ns driving 50 pF & 8 ns driving 500 pF
TRI-STATE outputs
Y
Y
Y
output (V ) is specified at 3.4V to provide additional noise
OH
High V
(3.4V min)
OH
immunity required by MOS inputs. A PNP input structure is
employed to minimize input currents. The circuit employs
Schottky-clamped transistors for high speed. A NOR gate of
two inputs, DIS1 and DIS2, controls the TRI-STATE mode.
High density
Ð Eight drivers and two disable controls for TRI-STATE
in a 20-pin package
Y
Y
PNP inputs reduce DC loading on bus lines
Glitch-free power up/down
Schematic and Connection Diagrams
Dual-In-Line Package
TL/F/5875–2
Top View
TL/F/5875–1
Order Number
DS1628J, DS3628J, DS3628N
See NS Package Number J20A or N20A
(Equivalent Input/Output Circuit)
Typical Application
Truth Table
Disable Input
Input
Output
DIS 1
DIS 2
H
H
X
L
H
X
H
L
X
X
X
H
L
Z
Z
Z
L
L
L
H
e
e
e
e
H
L
high level
low level
X
Z
don’t care
high impedance (off)
TL/F/5875–3
TRI-STATEÉ is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation
TL/F/5875
RRD-B30M115/Printed in U. S. A.