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MAX3031ECSE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3031ECSE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page sents the minimum parasitic capacitance that would exist in a typical application. In most cases, more capacitance exists in the system and reduces the mag- nitude of the glitch. During a “hot-swap” event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mV (Figures 12 and 13). Operation of Enable Pins The MAX3030E–MAX3033E family has two enable-func- tional versions. The MAX3030E/MAX3031E are compatible with 26LS31, where the two enable signals control all four transmitters (global enable). The MAX3032E/MAX3033E are compatible with the SN75174. EN1&2 controls transmitters 1 and 2, and EN 3&4 controls transmitters 3 and 4 (dual enable). Typical Applications The MAX3030E–MAX3033E offer optimum performance when used with the MAX3094E/MAX3096 3.3V quad differential line receivers. Figure 14 shows a typical RS- 422 connection for transmitting and receiving data. ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 10 ______________________________________________________________________________________ 4 µs/div DO_+ DO_+ - DO_- DO_- VCC 1V/div Figure 12. Differential Power-Up Glitch (0.1V/µs) 1.0 µs/div DO_+ DO_+ - DO_- DO_- VCC 1V/div Figure 13. Differential Power-Up Glitch (1V/µs) EN EN TX1 TX2 TX3 TX4 MODE 0 0 Active Active Active Active All transmitters active 0 1 High-Z High-Z High-Z High-Z All transmitters disabled 1 0 Active Active Active Active All transmitters active 1 1 Active Active Active Active All transmitters active Table 1. MAX3030E/MAX3031E Transmitter Controls EN1&2 EN3&4 TX1 TX2 TX3 TX4 MODE 0 0 High-Z High-Z High-Z High-Z All transmitters disabled 0 1 High-Z High-Z Active Active Tx 3 and 4 active 1 0 Active Active High-Z High-Z Tx 1 and 2 active 1 1 Active Active Active Active All transmitters active Table 2. MAX3032E/MAX3033E Transmitter Controls |
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