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MAX3480ACPI Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3480ACPI Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page Complete, Isolated, 3.3V RS-485/RS-422 Data Interface _______________________________________________________________________________________ 7 ______________________________________________________________Pin Description Driver Input. With DE ´ high, a low on DI´ forces output A low and output B high. Similarly, a high on DI´ forces output A high and output B low. Drives internal LED cathode through R1 (Table 1 of Figure 2). DI 9 Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 14. VCC4 10 Boosted V+ Voltage Input. Must be connected as shown in Figures 1 and 2. VCC3 8 Frequency Switch Input. If FS = VCC, switch frequency is high; if FS = 0V, switch frequency is low (normal connection). FS 6 Boost-Voltage Generator Outputs. See Figures 1 and 2. D1, D2 Logic-Side Ground Inputs. Must be connected; not internally connected. GND1, GND2 2 Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 10, and 14. VCC2 5, 12 PIN Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 2, 10, and 14. VCC1 1 3, 4 FUNCTION NAME Driver-Enable Input. The driver outputs, A and B, are enabled by bringing DE ´ high. The driver outputs are high impedance when DE ´ is low. If the driver outputs are enabled, the device functions as a line driver. While the driver outputs are high impedance, the device functions as a line receiver. Drives internal LED cathode through R2 (Table 1 of Figure 2). DE 11 Receiver Output. If A > B by 200mV, RO will be low; if A < B by 200mV, RO will be high. Open collector; must have pull-up (R3) to VCC (Table 1 of Figure 2). RO 13 Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 10. VCC5 14 Power-Supply Shutdown Input. Must be connected to logic ground. SD 7 PINS ON THE NON-ISOLATED SIDE |
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