DS3662J National Semiconductor, DS3662J Datasheet

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DS3662J

Manufacturer Part Number
DS3662J
Description
Quad High Speed Trapezoidal? Bus Transceiver
Manufacturer
National Semiconductor
Datasheet
© 1999 National Semiconductor Corporation
DS3662
Quad High Speed Trapezoidal
General Description
The DS3662 is a quad high speed Schottky bus transceiver
intended for use with terminated 120
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 180
from the bus to 5V logic supply, together with a 390 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.
Block and Connection Diagram
Trapezoidal
is a trademark of National Semiconductor Corp.
Order Number DS3662J, DS3662N or DS3662WM
impedance lines. It is
See NS Package Number J16A, N16A or M16B
DS005803
Dual-In-Line Package
resistor
Top View
Features
n Pin to pin functional replacement for DS8641
n Guaranteed AC specifications on noise immunity and
n Temperature insensitive receiver thresholds track bus
n Trapezoidal bus waveforms reduce noise coupling to
n Precision receiver thresholds provide maximum noise
n Open collector driver output allows wire-OR connection
n High speed Schottky technology
n 15 µA typical bus termination current with normal V
n Glitch free power up/down protection on the driver
n TTL compatible driver and disable inputs, and receiver
propagation delay over the specified temperature and
supply voltage range
logic level
adjacent lines
immunity and symmetrical response to positive and
negative going pulses
with V
output
outputs
Bus Transceiver
CC
= 0V
DS005803-1
www.national.com
July 1992
CC
or

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DS3662J Summary of contents

Page 1

... 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. Block and Connection Diagram Order Number DS3662J, DS3662N or DS3662WM See NS Package Number J16A, N16A or M16B Trapezoidal ™ trademark of National Semiconductor Corp. ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input and Output Voltage Storage Temperature Range Maximum Power Dissipation (Note 1) at 25˚C Cavity Package Molded Package Electrical Characteristics ...

Page 3

Switching Characteristics Note 5: Only one output at a time should be shorted. AC Test Circuits and Switching Waveforms = t = 2.5 ns. Pulse width = 500 ns measured between 1.5V levels MHz. Note ...

Page 4

AC Test Circuits and Switching Waveforms DS005803 2 (a) Receiver Output ( Remain Greater than 2.2V O FIGURE 4. Receiver Noise Immunity: “No Response at Output” Input Waveforms Typical Application www.national.com ...

Page 5

... Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Molded Small Outline Package (M) Ceramic Dual-In-Line Package (J) Order Number DS3662J NS Package Number J16A Order Number DS3662WM NS Package Number M16B 5 www.national.com ...

Page 6

... 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 ...

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