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MAX3223EAP Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX3223EAP Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 17 page Maxim Integrated | 5 www.maximintegrated.com MAX3221/MAX3223/MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Pin Description Noninverting Receiver Output—active in shutdown R2OUTB Output of the valid signal detector. Indicates if a valid RS-232 level is pres- ent on receiver inputs logic “1”. INVALID Drive low to shut down transmitters and on-board power supply. This over- rides all automatic circuitry and FORCEON (Table 1). FORCEOFF Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) (Table 1). FORCEON Negative terminal of the voltage doubler charge-pump capacitor C1- RS-232 Receiver Inputs R_IN RS-232 Transmitter Outputs T_OUT TTL/CMOS Transmitter Inputs T_IN TTL/CMOS Receiver Outputs R_OUT -5.5V generated by the charge pump V- Negative terminal of inverting charge-pump capacitor C2- Positive terminal of inverting charge-pump capacitor C2+ Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-Z state. EN FUNCTION Ground GND +3.0V to +5.5V Supply Voltage VCC LapLink is a trademark of Traveling Software. Detailed Description Dual Charge-Pump Voltage Converter The MAX3221/MAX3223/MAX3243’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), regardless of the input voltage (VCC) over the +3.0V to +5.5V range. The charge pumps operate in a 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 120kbps data rate with worst-case loads of 3k Ω in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as Laplink™). Typically, the MAX3221/MAX3223/MAX3243 can oper- ate at data rates of 235kbps. Transmitters can be paral- leled to drive multiple receivers or mice (MAX3243). Figure 1 shows a complete system connection. When FORCEOFF is driven to ground, or the Auto- Shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state. — 10 16 12 4 8 13 11 9 7 6 5 1 14 15 NAME MAX3221 +5.5V generated by the charge pump V+ 3 Positive terminal of the voltage doubler charge-pump capacitor C1+ 2 — 11 20 14 4 9, 16 8, 17 12, 13 10, 15 7 6 5 1 18 19 20 21 22 23 24 4–8 9, 10, 11 12, 13, 14 15–19 3 2 1 — 25 26 MAX3223 3 MAX3243 27 2 28 PIN |
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