SP503 datasheet(13/28 Pages) EXAR

13 / 28 page

SP503_101_101508

SP503 Multiprotocol Transceiver

of Figure 6 must be applied. The threshold of

the V.35 receiver is ±200mV. The V.35 receiv-

ers can operate up to 5Mbps. All of the differen-

tial receivers can receive data up to 5Mbps.

Decoder

The SP503 has the ability to change the inter-

face mode of the drivers or receivers via an 8–

bit switch. The decoder for the drivers and

receivers is not latched; it is merely a combina-

tional logic switch. The codes shown in Tables

1 and 2 are the only specified, valid modes for

the SP503. Undefined codes may represent other

interface modes not specified or random out-

puts (consult the factory for more information).

The drivers are controlled with the data bits

labeled TDEC

3–TDEC0. The drivers can be put

into tri-state mode by writing 0000 to the driver

decode switch. The receivers are controlled

with data bits RDEC

3–RDEC0; the code 0000

written to the receivers will place the outputs in

an undetermined state. All receivers, with the

exception of SCT, do not have tri-state capabil-

ity; the outputs will either be HIGH or

LOWdepending upon the state of the receiver

input.

SP503 Datasheet(PDF) 13 Page - Exar Corporation