82503 datasheet(3/45 Pages) INTEL

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82503

290421 – 1

Figure 1 Application Block Diagram

82503 PRODUCT FEATURES

The 82503 incorporates all the active circuitry re-

quired to interface Ethernet controllers to 10BASE-T

networks or the attachment unit interface (AUI) It

supports a direct no-glue interface to Intel’s family of

high-performance LAN controllers (82586 82590

82593 and 82596) The 82503 also provides a di-

rect no-glue interface to the National Semiconductor

8390 and 83932 (SONIC)

the Western Digital

83C690

the

Advanced

Micro

Devices

7990

(LANCE) and 79C900 (ILACC)

and the Fujitsu

86950 (Etherstar) controllers

This component includes three advanced features

jumperless two-port design capability automatic port

selection and polarity switching The jumperless

TPE or AUI port selection capability allows design-

ers maximum ease-of-use and network flexibility Au-

tomatic port selection ensures complete software

compatibility with existing 10BASE2 and 10BASE5

software drivers The 82503’s polarity switching fea-

ture will detect and correct polarity errors on the

twisted pairthe most common wiring fault in twist-

ed pair networks

The 82503 contains all the circuitry needed to meet

the 10BASE-T specification including link integrity a

jabber timer and internal predistortion Deselecting

link integrity allows the component to be used in

some prestandard networks The 82503’s jabber

timer prevents the station from continuously trans-

mitting and is defeatable for simple design charac-

terization The predistortion circuitry eliminates line

overcharge and reduces jitter on 10BASE-T links

The 82503 can also support twisted pair cable

lengths of up to 200m when placed in TPE Extended

Squelch Mode (XSQ)

This component incorporates six LED drivers to dis-

play transmit data receive data collision link integri-

ty polarity faults and port selections allowing for

complete network monitoring by the user The trans-

mit receive and collision LEDs indicate the rate of

activity by the frequency of flashing The 82503 also

has a low power mode During low power many of

the 82503’s pins are in a high-impedance state to

facilitate board-level testing

The 82503’s diagnostic loopback control enables it

to route a transmission signal from the LAN control-

ler through its Manchester encoder-decoder circuitry

and back to the LAN controller This provides effec-

tive network node fault detection and isolation capa-

bilities In addition the 82503 supports diagnostic

test modes that generate continuous tranmission of

data through the twisted pair port allowing design-

ers to measure the analog performance of their de-

sign

The 82503 is available in 44-lead PLCC and 44-lead

QFP packages and is fabricated with Intel’s low-

power high-speed CHMOS IV technology using a

single 5-V supply

82503 Datasheet(PDF) 3 Page - Intel Corporation

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