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MAX3241EUI Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3241EUI Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors _______________________________________________________________________________________ 9 Power-Supply Decoupling In most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power- supply noise, decouple VCC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible. Operation Down to 2.7V Transmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V. Transmitter Outputs when Exiting Shutdown Figure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans- mitter outputs are shown going to opposite RS-232 lev- els (one transmitter input is high, the other is low). Each transmitter is loaded with 3k Ω in parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V. Mouse Driveability The MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup- plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements. Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241. Table 1. MAX3222/MAX3237/MAX3241 Shutdown and Enable Control Truth Table Table 2. Required Minimum Capacitor Values 5V/div VCC = 3.3V C1–C4 = 0.1 µF 2V/div T2 50 µs/div T1 Figure 3. Transmitter Outputs when Exiting Shutdown or Powering Up VCC (V) C1 (µF) 4.5 to 5.5 0.047 3.0 to 5.5 0.1 C2, C3, C4 (µF) MAX3222/MAX3232/MAX3241 0.33 0.47 1 Active 0 1 Active 1 S SH HD DN N High-Z 1 0 High-Z 0 0 T_OUT E EN N High-Z Active High-Z Active R_OUT R_OUTB (MAX3237/ MAX3241) Active Active Active Active 3.0 to 3.6 0.22 3.15 to 3.6 0.1 MAX3237 0.22 0.1 4.5 to 5.5 0.047 3.0 to 5.5 0.22 0.33 1.0 3.0 to 3.6 0.1 0.1 |
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