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  • 參數(shù)資料
    型號(hào): TRS202CD
    廠商: Texas Instruments
    文件頁(yè)數(shù): 15/17頁(yè)
    文件大?。?/td> 0K
    描述: IC DRVR/RCVR RS232 ESD DL 16SOIC
    標(biāo)準(zhǔn)包裝: 760
    類型: 線路收發(fā)器
    驅(qū)動(dòng)器/接收器數(shù): 2/2
    規(guī)程: RS232
    電源電壓: 4.5 V ~ 5.5 V
    安裝類型: 表面貼裝
    封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
    供應(yīng)商設(shè)備封裝: 16-SOIC N
    包裝: 管件
    www.ti.com
    APPLICATION INFORMATION
    11
    10
    8
    1
    2
    3
    4
    7
    ROUT2
    DIN2
    9
    RIN1
    16
    13
    12
    15
    14
    DIN1
    5
    6
    +
    -
    V
    CC
    C2+
    C1+
    GND
    C1-
    ROUT1
    C2-
    +
    -
    CBYPASS
    =0.1 F,
    m
    V+
    +
    -
    +
    -
    RIN2
    +
    -
    DOUT1
    DOUT2
    C3canbeconnectedtoV
    orGND.
    CC
    NOTES: A .Resistorvaluesshownarenominal.
    V-
    C1
    0.1 F,
    m
    6.3V
    C3
    0.1 F
    m
    16V
    C2
    0.1 F,
    m
    16V
    5kW
    C4
    0.1 mF,
    16V
    B.Nonpolarizedceramiccapacitorsareacceptable.Ifpolarizedtantalumorelectrolyticcapacitorsareused,theyshouldbe
    connectedasshown.
    Capacitor Selection
    Electrostatic Discharge (ESD) Protection
    5-V DUAL RS-232 LINE DRIVER/RECEIVER
    WITH
    ±15-kV ESD PROTECTION
    SLLS808 – JULY 2007
    Figure 4. Typical Operating Circuit and Capacitor Values
    The capacitor type used for C1–C4 is not critical for proper operation. The TRS202 requires 0.1-
    μF capacitors,
    although capacitors up to 10
    μF can be used without harm. Ceramic dielectrics are suggested for the 0.1-μF
    capacitors. When using the minimum recommended capacitor values, make sure the capacitance value does
    not degrade excessively as the operating temperature varies. If in doubt, use capacitors with a larger (e.g., 2
    ×)
    nominal value. The capacitors' effective series resistance (ESR), which usually rises at low temperatures,
    influences the amount of ripple on V+ and V–.
    Use larger capacitors (up to 10
    μF) to reduce the output impedance at V+ and V–.
    Bypass VCC to ground with at least 0.1 μF. In applications sensitive to power-supply noise generated by the
    charge pumps, decouple VCC to ground with a capacitor the same size as (or larger than) the charge-pump
    capacitors (C1–C4).
    TI TRS202 devices have standard ESD protection structures incorporated on the pins to protect against
    electrostatic discharges encountered during assembly and handling. In addition, the RS232 bus pins (driver
    outputs and receiver inputs) of these devices have an extra level of ESD protection. Advanced ESD structures
    were designed to successfully protect these bus pins against ESD discharge of
    ±15 kV when powered down.
    7
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