SP504MCF datasheet(17/31 Pages) SIPEX

17 / 31 page

Rev: A Date:1/27/04

SP504 Multi–Mode Serial Transceivers

tory for more information). The drivers are

controlled with the data bits labeled TDEC

3–

TDEC

0. All of the drivers can be put into tri-

state mode by writing 0000 to the driver decode

switch. The three drivers TxD, ST and TxC,

have a 150

Ω pull-down resistor to ground con-

nected at the (b) output. This resistor is part of

the V.35 driver circuitry and should be con-

nected when in V.35 mode. Tri-state is possible

for all drivers in RS-232 mode. The receivers

are controlled with data bits RDEC

3–RDEC0;

the code 0000 written to the receivers will place

the outputs into tri-state mode. The 0000 de-

coder word will override the enable control line

for the one receiver (SCT).

Using the V.35_STAT Pin

The SP504 includes a V.35 status pin where the

V35_STAT pin (pin 18) is a logic HIGH ("1")

when the decoder is set to V.35 mode. The pin

is a logic LOW ("0") when in all other modes

including tri-state (decoder set at "0000"). Pin

18 allows the user to easily add FET switches or

solid state relays to connect the external 150

Ω

resistor for V.35 operation. V35_STAT can be

connected to the gate of the FET switches or the

control of the relays so that the 150

Ω resistors

are connected to the non-inverting output of the

three V.35 drivers. The output current of the

V35_STAT pin is that of a typical TTL load of

–3.2mA. The electrical specifications are simi-

lar to the SP504 receiver outputs. This feature

would reduce additional logic required by older

traditional methods.

NET1/NET2 Testing and Compliancy

Many system designers are required to certify

their system for use in the European public

network. Electrical testing is performed in ad-

herence to the NET (Norme Européenne de

Télécommunication) which specifies the ITU

Series V specifications. The SP504 adheres to

all the required physical layer testing for NET1

and NET2. Consult factory for details.

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