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MAX3227 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3227 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 20 page _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3224–MAX3227/MAX3244/MAX3245’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 range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump is enabled; 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. The READY output (MAX3224–MAX3227) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V. RS-232 Transmitters The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224/MAX3226/MAX3244 guarantee a 250kbps data rate (1Mbps for the MAX3225/MAX3227/ MAX3245) with worst-case loads of 3k Ω in parallel with 1000pF, providing compatibility with PC-to-PC com- munication software (such as LapLink™). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection. 1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus _______________________________________________________________________________________ 7 PIN NAME MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245 1 1 — READY 2 2 28 C1+ Positive Terminal of Voltage-Doubler Charge-Pump Capacitor 3 3 27 V+ +5.5V generated by the charge pump 4 4 24 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor 5 5 1 C2+ Positive Terminal of Inverting Charge-Pump Capacitor 6 6 2 C2- Negative Terminal of Inverting Charge-Pump Capacitor 7 7 3 V- -5.5V generated by the charge pump 8, 17 13 9–11 T_OUT RS-232 Transmitter Outputs 9, 16 8 4–8 R_IN RS-232 Receiver Inputs 10, 15 9 15–19 R_OUT TTL/CMOS Receiver Outputs 11 10 21 INVALID Valid Signal Detector Output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. 12, 13 11 12–14 T_IN TTL/CMOS Transmitter Inputs 14 12 23 FORCEON Force-On Input, active high. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). 18 14 25 GND Ground 19 15 26 VCC +3.0V to +5.5V Single Supply Voltage 20 16 22 FORCEOFF Force-Off Input, active low. Drive low to shut down transmitters, receivers (except R2OUTB), and charge pump. This overrides AutoShutdown Plus and FORCEON (Table 1). — — 20 R2OUTB TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. Ready to Transmit Output, active high. READY is enabled high when V- goes below -4V and the device is ready to transmit. FUNCTION Pin Description LapLink is a trademark of Traveling Software. |
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