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MAX3241E Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3241E Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 20 page _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3222E/MAX3232E/MAX3237E/MAX3241E’s internal power supply consists of a regulated 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 ±5.0V EIA/TIA-232-com- pliant levels. The MAX3222E/MAX3232E/MAX3237E/MAX3241E 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 paralleled to drive multiple receivers or mice. The MAX3222E/MAX3237E/MAX3241E’s transmitters are disabled and the outputs are forced into a high-imped- ance state when the device is in shutdown mode (SHDN = GND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E permit the outputs to be driven up to ±12V in shutdown. The MAX3222E/MAX3232E/MAX3241E transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC. The MAX3237E transmitter 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 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 shut- down (Table 1). ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers _______________________________________________________________________________________ 7 _________________________________________________Pin Description (continued) No Connection N.C. — MegaBaud Control Input. Connect to GND for normal operation; connect to VCC for 1Mbps transmission rates. MBAUD 15* Noninverting Complementary Receiver Outputs. Always active. R_OUTB 16 Shutdown Control. Active low. SHDN 14* +3.0V to +5.5V Supply Voltage VCC 26 FUNCTION NAME MAX3237E 11, 14 — — — — — 20 18 19 17 TSSOP/ SSOP SO/DIP MAX3222E 1, 10, 11, 20 — — — — — — — 19 16 TSSOP/ SSOP SO/DIP MAX3232E — — 20, 21 22 26 PIN MAX3241E *These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected. LapLink is a trademark of Traveling Software. |
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