Octal TRI-STATE MOS Drivers
DS1628 DS3628 Octal TRI-STATE MOS Drivers
February 1986
DS1628 DS3628 Octal TRI-STATE MOS Drivers
General Description
...
Description
DS1628 DS3628 Octal TRI-STATE MOS Drivers
February 1986
DS1628 DS3628 Octal TRI-STATE MOS Drivers
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’ output (VOH) is specified at 3 4V to provide additional noise 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
Features
Y Y Y Y
Y Y
High speed capabilities Typical 5 ns driving 50 pF 8 ns driving 500 pF TRI-STATE outputs High VOH (3 4V min) High density Eight drivers and two disable controls for TRI-STATE in a 20-pin package PNP inputs reduce DC loading on bus lines Glitch-free power up down
bs ol
TL F 5875–1
(Equivalent Input Output Circuit)
Truth Table
DIS 1 H H X L L
Disable Input
Input X X X H L
Output Z Z Z L H
O
H X H L L
H e high level L e low level X e don’t care Z e high impedance (off)
C1995 National Semiconductor Corporation TL F 5875
DIS 2
TRI-STATE is a registered trademark of National Semiconductor Corp
et
Top View
TL F 5875– 2
Order Number DS1628J DS3628J DS3628N See NS Package Number J20A or N20A
Typical Application
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Dual-In-Line Package
TL F 5875 –3
RRD-B30M115 Printed in U S A
Schematic and Connection Diagrams
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Absolute Maximum Ratings (Note 1)
If Military Aerospa...
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