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MAX3222CPN Datasheet(PDF) 11 Page - Tiger Electronic Co.,Ltd |
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MAX3222CPN Datasheet(HTML) 11 Page - Tiger Electronic Co.,Ltd |
11 / 16 page VCC 0.1 F T1IN 5V/div C1+ C1 C1- C2+ C2 C2- T_ IN VCC MAX3222 MAX3232 MAX3237 MAX3241 V+ C3 V- C4 T_ OUT T1OUT R1OUT VCC = 3.3V 5 s/div 5V/div 5V/div Figure 6. MAX3241 Loopback Test Result at 120kbps 0V VCC R_ OUT EN * SHDN * GND R_ IN 5k 1000pF T1IN T1OUT 5V/div 5V/div * MAX3222/MAX3241 ONLY Figure 5. Loopback Test Circuit R1OUT VCC = 3.3V 2 s/div 5V/div 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 Figure 7. MAX3241 Loopback Test Result at 235kbps +5V 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. 0V +5V 0V -5V +5V 0V VCC = 3.3V 200ns/div T_IN T_OUT = R_IN 5k + 250pF R_OUT 150pF Figure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = VCC) |
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