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Teilenummer | DS3662WM |
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Beschreibung | Quad High Speed Trapezoidal Bus Transceiver | |
Hersteller | National Semiconductor | |
Logo | ||
Gesamt 6 Seiten July 1992
DS3662
Quad High Speed Trapezoidal™ Bus Transceiver
General Description
The DS3662 is a quad high speed Schottky bus transceiver
intended for use with terminated 120Ω impedance lines. It is
specifically designed to reduce noise in unbalanced trans-
mission systems. The open collector drivers generate pre-
cise trapezoidal waveforms with rise and fall times of 15 ns
(typical), which are relatively independent of capacitive load-
ing conditions on the outputs. This reduces noise coupling to
the adjacent lines without any appreciable impact on the
maximum data rate obtainable with high speed bus trans-
ceivers. In addition, the receivers use a low pass filter in con-
junction with a high speed comparator, to further enhance
the noise immunity. Tightly controlled threshold levels on the
receiver provide equal rejection to both negative and positive
going noise pulses on the bus.
The external termination is intended to be a 180Ω resistor
from the bus to 5V logic supply, together with a 390Ω resistor
from the bus to ground. The bus can be terminated at one or
both ends. A two input NOR gate is provided to disable all
drivers in a package simultaneously.
Features
n Pin to pin functional replacement for DS8641
n Guaranteed AC specifications on noise immunity and
propagation delay over the specified temperature and
supply voltage range
n Temperature insensitive receiver thresholds track bus
logic level
n Trapezoidal bus waveforms reduce noise coupling to
adjacent lines
n Precision receiver thresholds provide maximum noise
immunity and symmetrical response to positive and
negative going pulses
n Open collector driver output allows wire-OR connection
n High speed Schottky technology
n 15 µA typical bus termination current with normal VCC or
with VCC = 0V
n Glitch free power up/down protection on the driver
output
n TTL compatible driver and disable inputs, and receiver
outputs
Block and Connection Diagram
Dual-In-Line Package
DS005803-1
Top View
Order Number DS3662J, DS3662N or DS3662WM
See NS Package Number J16A, N16A or M16B
Trapezoidal™ is a trademark of National Semiconductor Corp.
© 1999 National Semiconductor Corporation DS005803
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number DS3662N
NS Package Number N16A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
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Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
6 Page | ||
Seiten | Gesamt 6 Seiten | |
PDF Download | [ DS3662WM Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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