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MAX1480E-MAX1490E Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1480E-MAX1490E Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 19 page ±15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces 10 ______________________________________________________________________________________ The high-speed optocouplers on the MAX1480EA/ MAX1480EC/MAX1490EA consume an additional 10mA through VCC5 (VCC4 for the MAX1490EA). Therefore, to completely shut down these devices, use an external P- channel MOSFET as shown in Figure 3. In normal opera- tion, SD is low, turning the MOSFET on and thereby providing power to all the VCC pins. When SD is pulled high, the power oscillator is disabled and the switch is turned off, disconnecting power from the DI and DE opto- couplers. In normal operating mode, the switch carries only the optocoupler currents, so an on-resistance of sev- eral ohms does not significantly degrade efficiency. AC1 (MAKE NO CONNECTION) AC2 (MAKE NO CONNECTION) SHIELD (OPTIONAL) EXTERNAL RS-485/RS-422 WIRING ISO VCC1 B D2 D1 VCC2 VCC1 ISO RO DRV A B A SH ISO DI IN ISO DE IN VCC3 SD FS GND1 ISO COM1 ISO DI DRV ISO VCC2 ISO DE DRV GND2 DE VCC4 DI ISO COM2 ISO RO LED VCC5 RO RL RL R4* R5* R7 100 Ω R1* R2* R3* R6* DE ´ DI ´ VIN +5V C1 22 µF C2 0.1 µF LOGIC GROUND ISOLATION BARRIER ISOLATED COMMON DRIVER INPUT DRIVER ENABLE RECEIVER OUTPUT DE DI RO 74HC86 OR EQUIVALENT MAX1487E MAX487E MAX845E 1 2 28 27 3 4 5 6 7 8 9 10 11 12 13 14 26 25 24 23 22 21 20 19 18 17 16 15 MAX845E N MAX1480EA: MAX1487E MAX1480EC: MAX487E RE ISO RO DRV ISO DE IN ISO DI IN ISO COM1 ISO VCC1 A B R D N Q Q T F/F VCC3 FS OSC 1.07MHz/ 1.45MHz SD GND1 D2 D1 SHIELD (OPTIONAL) NOTE: RESISTOR R7 PROTECTS THE MAX1480EA FROM TRANSIENT CURRENTS BETWEEN SHIELD AND TRANSMISSION LINES. TWISTED PAIR TO OTHER TRANSCEIVERS TERMINATING RESISTOR (ONE RESISTOR ON EACH END) TWISTED PAIR TO OTHER TRANSCEIVERS *SEE TABLE 1. MAX1480EA MAX1480EC 270pF 4kV Figure 1. MAX1480EA/MAX1480EC Detailed Block Diagram and Application Circuit Table 1. Pullup and LED Drive Resistors for Figure 1 PART R1 ( Ω) R2 ( Ω) R3 ( Ω) MAX1480EA MAX1480EC 200 200 200 200 1000 3000 R4 ( Ω) 4300 3000 R5 ( Ω) 1000 3000 R6 ( Ω) 200 200 |
Similar Part No. - MAX1480E-MAX1490E |
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Similar Description - MAX1480E-MAX1490E |
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