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DP8392C-1 Datasheet(PDF) 2 Page - Texas Instruments |
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DP8392C-1 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page TLF11085 October 1995 DP8392CDP8392C-1 CTI Coaxial Transceiver Interface General Description The DP8392C 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 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 Functions 32 Transmitter Functions 33 Collision Functions 34 Jabber Functions 40 Typical Applications 50 Connection Diagrams 60 Pin Descriptions 70 Absolute Maximum Ratings 80 DP8392C Electrical Characteristics 90 DP8392C-1 Electrical Characteristics 100 Switching Characteristics 110 Timing and Load Diagram 10 System Diagram TLF11085 – 1 IEEE 8023 Compatible EthernetCheapernet Local Area Network Chip Set C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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