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MAX232EIDWRG4 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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MAX232EIDWRG4 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 27 page 1 mF 1 mF VS+ VS− 2 6 14 7 13 8 C1+ C1− C2+ C2− 1 3 4 5 11 10 12 9 GND 15 0 V VCC 16 5 V RS-232 Output RS-232 Output RS-232 Input RS-232 Input 1 mF 8.5 V −8.5 V 1 mF From CMOS or TTL To CMOS or TTL CBYPASS = 1 mF C1 C2 C3† C4 † C3 can be connected to VCC or GND. + + − Copyright © 2016, Texas Instruments Incorporated 11 MAX232E www.ti.com SLLS723C – APRIL 2006 – REVISED AUGUST 2016 Product Folder Links: MAX232E Submit Documentation Feedback Copyright © 2006–2016, Texas Instruments Incorporated 9 Applications and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information For proper operation add capacitors as shown in Figure 10. Pins 9 through 12 connect to UART or general purpose logic lines. RS-232 lines on pins 7, 8, 13, and 14 connect to a connector or cable. 9.2 Typical Application Resistor values shown are nominal. Nonpolarized ceramic capacitors are acceptable. If polarized tantalum or electrolytic capacitors are used, they should be connected as shown. Figure 10. Typical Operating Circuit 9.2.1 Design Requirements • VCC minimum is 4.5 V and maximum is 5.5 V. • Maximum recommended bit rate is 250 kbit/s. 9.2.2 Detailed Design Procedure The capacitor type used for C1–C4 is not critical for proper operation. The MAX232E requires 1-µF capacitors, although capacitors up to 10 µF can be used without harm. Ceramic dielectrics are suggested for 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 (for example, 2×) nominal value. The capacitors' effective series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V–. |
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