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DS3649 Datasheet

  • DS3649

  • 142.92KB

  • 6頁

  • ETC

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DS1649 DS3649 DS1679 DS3679 Hex TRI-STATE 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
Y
Y
Y
High speed capabilities

Typ 9 ns driving 50 pF

Typ 30 ns driving 500 pF
TRI-STATE outputs for data bussing
Built-in 15X damping resistor (DS1649 DS3649)
Same pin-out as DM8096 and DM74366
Schematic Diagram
Truth Table
Disable Input
DIS 1
0
0
0
1
1
DIS 2
0
0
1
0
1
0
1
X
X
X
1
0
Hi-Z
Hi-Z
Hi-Z
Input Output
X
e
Don鈥檛 care
Hi-Z
e
TRI-STATE mode
DS1649 DS3649 only
TL F 7515 鈥?1
Connection Diagram
Dual-In-Line Package
Typical Application
TL F 7515 鈥?2
Top View
Order Number DS1649J DS3649J
DS1679J DS3679J DS3649N or DS3679N
See NS Package Number J16A or N16A
C
1995 National Semiconductor Corporation
TL F 7515
TL F 7515 鈥?3
RRD-B30M105 Printed in U S A

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