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MAX3320_CAP Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3320_CAP Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page 6 _______________________________________________________________________________________ ______________ Detailed Description Dual Charge-Pump Voltage Converter The MAX3320’s internal power supply consists of a reg- ulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) while VCC remains in the 3V to 5.5V range. The charge pumps operate in discontinuous mode; they are enabled if the output voltages are less than 5.5V, and disabled if output voltages exceed 5.5V. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies. RS-232 Transmitters The transmitters are inverting level translators that con- vert CMOS-logic levels to 5V EIA/TIA-232 levels. The MAX3320 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. Figure 1 shows a complete system connection. When FORCEOFF is driven to ground, the transmitter’s outputs become high impedance. When the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30sec, the transmitters turn off and the outputs go into a high- impedance state, but the receivers remain active. When the power is off or the MAX3320 is shut down, outputs may be driven up to ±12V. The transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC. Laplink is a trademark of Traveling Software. RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic out- put levels. All receivers have inverting outputs and are active in shutdown FORCEOFF (Table 1). AutoShutdown Plus Mode Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is high and FORCEON is low, achieves a 4µA supply current. When the MAX3320 senses no valid signal levels on all receiver and transmitter inputs for 30sec, the on-board power supply and drivers shut off, MAX3320 I/O CHIP WITH UART CPU RS-232 POWER- MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID T1 T2 R1 R2 Figure 1. Interface Under Control of PMU Table 1. MAX3320 Output Control Truth Table FORCEOFF 0 High-Z T_OUT Active R_OUT 1 Active Active Normal operation (forced on) X 1 1 Active Active Normal operation (AutoShutdown Plus) <30sec* 0 1 High-Z Active Shutdown (AutoShutdown Plus) >30sec* 0 FORCEON Shutdown (forced off) X X OPERATION STATUS AUTOSHUTDOWN PLUS* X = Don’t Care * Time since last receiver or transmitter input activity 3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power-On Reset |
Similar Part No. - MAX3320_CAP |
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Similar Description - MAX3320_CAP |
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