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DP8392B Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DP8392B
Description  Coaxial Transceiver Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DP8392B Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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TLF10427
July 1989
DP8392BNS32492B Coaxial Transceiver Interface
General Description
The DP8392B Coaxial Transceiver Interface (CTI) is a coax-
ial cable line driverreceiver for EthernetThin Ethernet
(Cheapernet) type local area networks The CTI is connect-
ed between the coaxial cable and the Data Terminal Equip-
ment (DTE) In Ethernet applications the transceiver is usu-
ally mounted within a dedicated enclosure and is connected
to the DTE via a transceiver cable In Cheapernet applica-
tions the CTI is typically located within the DTE and con-
nects to the DTE through isolation transformers only The
CTI consists of a Receiver Transmitter Collision Detector
and a Jabber Timer The Transmitter connects directly to a
50 ohm coaxial cable where it is used to drive the coax
when transmitting During transmission a jabber timer is ini-
tiated to disable the CTI transmitter in the event of a longer
than legal length data packet Collision Detection circuitry
monitors the signals on the coax to determine the presence
of colliding packets and signals the DTE in the event of a
collision
The CTI is part of a three chip set that implements the com-
plete IEEE 8023 compatible network node electronics as
shown below The other two chips are the DP8391 Serial
Network Interface (SNI) and the DP8390 Network Interface
Controller (NIC)
The SNI provides the Manchester encoding and decoding
functions whereas the NIC handles the Media Access Pro-
tocol and the buffer management tasks Isolation between
the CTI and the SNI is an IEEE 8023 requirement that can
be easily satisfied on signal lines using a set of pulse trans-
formers that come in a standard DIP However the power
isolation for the CTI is done by DC-to-DC conversion
through a power transformer
Features
Y
Optimized for receive mode collision detection
Y
Compatible with Ethernet II IEEE 8023 10Base5 and
10Base2 (Cheapernet)
Y
Integrates all transceiver electronics except signal
power isolation
Y
Innovative design minimizes external component count
Y
Jabber timer function integrated on chip
Y
Externally selectable CD Heartbeat allows operation
with IEEE 8023 compatible repeaters
Y
Precision circuitry implements receive mode collision
detection
Y
Squelch circuitry at all inputs rejects noise
Y
Designed
for
rigorous
reliability
requirements
of
IEEE 8023
Y
Standard Outline 16-pin DIP uses a special leadframe
that significantly reduces the operating die temperature
Table of Contents
10
System Diagram
20
Block Diagram
30
Functional Description
31
Receiver and Squelch
32
Transmitter and Squelch
33
Collision and Heartbeat
34
Jabber Timer
40
Connection Diagram
50
Pin Descriptions
60
Absolute Maximum Ratings
70
Electrical Characteristics
80
Switching Characteristics
90
Timing and Load Diagram
100 Physical Dimensions
10 System Diagram
TLF10427 – 1
IEEE 8023 Compatible EthernetCheapernet Local Area Network Chip Set
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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