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MAX3222EPN Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3222EPN Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors ______________________________________________________________________________________ 11 High Data Rates The MAX3222/MAX3232/MAX3241 maintain the RS-232 ±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps. For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 7, a single transmitter was driven at 235kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF. The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps. Figure 8 shows a loopback test result at 1Mbps with MBAUD = VCC. For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF. MAX3222 MAX3232 MAX3237 MAX3241 5k R_ IN R_ OUT EN * C2- C2+ C1- C1+ V- V+ VCC C4 C3 C1 C2 0.1 µF VCC SHDN * T_ OUT T_ IN GND VCC 0V 1000pF * MAX3222/MAX3241 ONLY T1IN R1OUT VCC = 3.3V T1OUT 5V/div 5V/div 5V/div 5 µs/div Figure 5. Loopback Test Circuit Figure 6. MAX3241 Loopback Test Result at 120kbps T1IN R1OUT VCC = 3.3V T1OUT 5V/div 5V/div 2 µs/div 5V/div Figure 7. MAX3241 Loopback Test Result at 235kbps +5V 0V +5V 0V -5V +5V 0V T_IN T_OUT = R_IN 5k + 250pF R_OUT 150pF 200ns/div VCC = 3.3V Figure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = VCC) |
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