82503 Datasheet, PDF (3/45 Pages) Intel Corporation – DUAL SERIAL TRANSCEIVER (DST)

82503
Figure 1 Application Block Diagram
290421 – 1
1 0 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 pair the 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
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