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MAX208CDW Datasheet(PDF) 8 Page - Texas Instruments |
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MAX208CDW Datasheet(HTML) 8 Page - Texas Instruments |
8 / 14 page MAX208 5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER WITH ±15kV ESD PROTECTION SLLS596A − OCTOBER 2003 − REVISED JANUARY 2004 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION capacitor selection The capacitor type used for C1−C4 is not critical for proper operation. The MAX208 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, ensure that 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). ESD protection Texas Instruments MAX208 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. ESD test conditions ESD testing is stringently performed by TI, based on various conditions and procedures. Please contact Texas Instruments for a reliability report that documents test setup, methodology, and results. Human-Body Model (HBM) The Human-Body Model of ESD testing is shown in Figure 5, while Figure 6 shows the current waveform that is generated during a discharge into a low impedance. The model consists of a 100-pF capacitor, charged to the ESD voltage of concern and subsequently discharged into the DUT through a 1.5-k Ω resistor. − + DUT RD 1.5 k Ω VHBM 100 pF CS Figure 5. HBM ESD Test Circuit |
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