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  • 參數(shù)資料
    型號: SP504MCM-L
    廠商: Exar Corporation
    文件頁數(shù): 10/32頁
    文件大?。?/td> 0K
    描述: IC TXRX WAN MULTI-MODE 80LQFP
    標(biāo)準(zhǔn)包裝: 84
    類型: 收發(fā)器
    驅(qū)動器/接收器數(shù): 7/7
    規(guī)程: 多協(xié)議
    電源電壓: 5V
    安裝類型: 表面貼裝
    封裝/外殼: 80-LQFP
    供應(yīng)商設(shè)備封裝: 80-LQFP(14x14)
    包裝: 托盤
    其它名稱: 1016-1682
    SP504MCM-L-ND
    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
    150pull-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 150 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 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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