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MAX3223ECAP+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3223ECAP+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 19 page ±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3221E/MAX3223E/MAX3243E’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 pumps operate in discontinuous mode: if the output voltages are less than 5.5V, the charge pumps are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled. 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 5.0V EIA/TIA-232 levels. They 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 mul- tiple receivers. The MAX3243E has been specifically designed to drive serial mice. Figure 1 shows a com- plete system connection. When FORCEOFF is driven to ground, or the AutoShutdown circuitry senses invalid voltage levels on all receiver inputs, the transmitters are disabled and the outputs are forced into a high-imped- ance state. When powered off or shut down, the output can be driven up to ±12V. The transmitter inputs do not have pull-up resistors. Pin Description (continued) PIN MAX3221E MAX3223E MAX3243E TQFN- EP SSOP/ TSSOP TQFN- EP DIP/ SSOP/ TSSOP SO/ SSOP/ TSSOP TQFN- EP NAME FUNCTION — — — — — 19, 20 R_OUTB Noninverting Complementary Receiver Outputs. Always active. — — — — — 9, 16, 25, 32 N.C. No Connection. Not internally connected. — — — — — — EP Exposed Paddle (TQFN package only). Solder the exposed paddle to the ground plane or leave unconnected. MAX3243E I/O CHIP WITH UART CPU RS-232 POWER- MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID Figure 1. Interface Under Control of PMU LapLink is a trademark of Traveling Software. Maxim Integrated 7 MAX3221E/MAX3223E/MAX3243E |
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