DP8392CV National Semiconductor, DP8392CV Datasheet

IC TRANSCEIVER COAX INT 28-PLCC

DP8392CV

Manufacturer Part Number
DP8392CV
Description
IC TRANSCEIVER COAX INT 28-PLCC
Manufacturer
National Semiconductor
Series
DPr
Type
Transceiverr
Datasheet

Specifications of DP8392CV

Number Of Drivers/receivers
1/1
Protocol
IEEE 802
Voltage - Supply
9V
Mounting Type
Surface Mount
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*DP8392CV

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C 1995 National Semiconductor Corporation
DP8392C DP8392C-1 CTI
Coaxial Transceiver Interface
General Description
The DP8392C Coaxial Transceiver Interface (CTI) is a coax-
ial cable line driver receiver for Ethernet Thin 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 802 3 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 802 3 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
1 0 System Diagram
IEEE 802 3 Compatible Ethernet Cheapernet Local Area Network Chip Set
TL F 11085
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Table of Contents
1 0 System Diagram
2 0 Block Diagram
3 0 Functional Description
4 0 Typical Applications
5 0 Connection Diagrams
6 0 Pin Descriptions
7 0 Absolute Maximum Ratings
8 0 DP8392C Electrical Characteristics
9 0 DP8392C-1 Electrical Characteristics
10 0 Switching Characteristics
11 0 Timing and Load Diagram
Compatible with Ethernet II IEEE 802 3 10Base5 and
10Base2 (Cheapernet)
Integrates all transceiver electronics except signal
power isolation
Innovative design minimizes external component count
Jabber timer function integrated on chip
Externally selectable CD Heartbeat allows operation
with IEEE 802 3 compatible repeaters
Precision circuitry implements receive mode collision
detection
Squelch circuitry at all inputs rejects noise
Designed
IEEE 802 3
Standard Outline 16-pin DIP uses a special leadframe
that significantly reduces the operating die temperature
3 1 Receiver Functions
3 2 Transmitter Functions
3 3 Collision Functions
3 4 Jabber Functions
for
rigorous
reliability
RRD-B30M115 Printed in U S A
requirements
October 1995
TL F 11085– 1
of

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DP8392CV Summary of contents

Page 1

... DIP However the power isolation for the CTI is done by DC-to-DC conversion through a power transformer 1 0 System Diagram IEEE 802 3 Compatible Ethernet Cheapernet Local Area Network Chip Set C 1995 National Semiconductor Corporation TL F 11085 Features Compatible with Ethernet II IEEE 802 3 10Base5 and Y ...

Page 2

Block Diagram 3 0 Functional Description The CTI consists of four main logical blocks a) the Receiver - receives data from the coax and sends it to the DTE b) the Transmitter - accepts data from the DTE ...

Page 3

Functional Description 3 3 COLLISION FUNCTIONS The collision circuitry consists of two buffers two 4-pole Bessel low pass filters (section comparator a heart- beat generator a 10 MHz oscillator and a differential line driver Two ...

Page 4

... Note pulse transformer L 100 H e Pulse Engineering (San Diego) Part No 64103 Valor Electronics (San Diego) Part No LT6003 or equivalent 5 0 Connection Diagrams Order Number DP8392CV See NS Package Number V28A FIGURE 4 Top View Order Number DP8392CN See NS Package Number N16E TL F 11085–6 ...

Page 5

Pin Descriptions 28-Pin PLCC 16-Pin DIP Name ...

Page 6

... EACH set of pins should be for applications with low transmitter duty cycle and for high transmit duty cycle applications Figure 7 illustrates a recommended component side layout for these planes FIGURE 7 Recommended Layout and Dissipation Planes for DP8392CV (Not to Scale ...

Page 7

... Conditions 12V Watts Supply Voltage (V EE See Section 5 Ambient Temperature If Military Aerospace specified devices are required 0 to 12V b please contact the National Semiconductor Sales 65 to 150 C b Office Distributors for availability and specifications 260 are measured after the pulse transformer except V ...

Page 8

DP8392C Switching Characteristics Symbol Parameter t Receiver startup delay (RXI to RX RON t Receiver propagation delay (RXI Differential outputs rise time ( Differential outputs fall time ( Receiver cable ...

Page 9

Timing and Load Diagrams FIGURE 8 Receiver Timing FIGURE 9 Transmitter Timing FIGURE 10 Collision Timing FIGURE 11 Heartbeat Timing 11085– 11085– 11085– 11085 – 10 ...

Page 10

Timing and Load Diagrams The 50 H inductance is for testing purposes Pulse transformers with higher inductances are recommended (see Figure 4 ) (Continued) FIGURE 12 Jabber Timing Receiver equalization (jitter correction Input jitter at ...

Page 11

Physical Dimensions inches (millimeters) Order Number DP8392CN or DP8392CN-1 Molded Dual-In-Line Package (N) NS Package Number N16E 11 ...

Page 12

... Physical Dimensions inches (millimeters) (Continued) Order Number DP8392CV or DP8392CV-1 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 OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or ...

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