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SP504 Datasheet(PDF) 18 Page - Exar Corporation |
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SP504 Datasheet(HTML) 18 Page - Exar Corporation |
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18 / 32 page  8 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP504_02_2708 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP504_02_2708 may represent other interface modes not specified (consult the factory for more in- formation). The drivers are controlled with the data bits labeled TDEC 3–TDEC0. 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 150Ωpull-downresistortogroundconnected at the (b) output. This resistor is part of the V.35drivercircuitryandshouldbeconnected 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 decoder 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 8) is a logic HIGH ("") 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 8 allows the user to easily add FET switches or solid state relays to connect the external 150Ω 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 150Ω 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 similar to the SP504 receiver outputs. This feature would reduce additional logic required by older traditional methods. NET/NET2 Testing and Compliancy Manysystemdesignersarerequiredtocertify their system for use in the European public network. Electrical testing is performed in adherence 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 NET and NET2. Consult factory for details. |
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