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MAX3246EEBX-T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3246EEBX-T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 26 page ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers _______________________________________________________________________________________ 9 Detailed Description Dual Charge-Pump Voltage Converter The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246Es’ internal power supply consists of a regu- lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V VCC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1). RS-232 Transmitters The transmitters are inverting level translators that con- vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli- ant levels. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ω in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par- alleled to drive multiple receivers or mice. The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forced into a high-impedance state when the device is in shut- down mode (SHDN = GND). The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown. The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or VCC. The MAX3237E’s trans- mitter inputs have a 400k Ω active positive-feedback resistor, allowing unused inputs to be left unconnected. MAX3237E MegaBaud Operation For higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = VCC), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ω in parallel with 250pF for +3.0V < VCC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ω in parallel with 1000pF. RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/ MAX3246E receivers have inverting three-state outputs. Drive EN high to place the receiver(s) into a high- impedance state. Receivers can be either active or inactive in shutdown (Table 1). MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E 5k Ω R_ IN R_ OUT C2- C2+ C1- C1+ V- V+ VCC C4 C3 C1 C2 0.1 µF VCC T_ OUT T_ IN GND 7k Ω 150pF MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E 5k Ω R_ IN R_ OUT C2- C2+ C1- C1+ V- V+ VCC C4 C3 C1 C2 0.1 µF VCC T_ OUT T_ IN GND 3k Ω 1000pF (2500pF, MAX3237E only) MINIMUM SLEW-RATE TEST CIRCUIT MAXIMUM SLEW-RATE TEST CIRCUIT Figure 1. Slew-Rate Test Circuits LapLink is a trademark of Traveling Software. |
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