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19-3270; Rev 0; 4/04
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
General Description
The MAX3535E/MXL1535E isolated RS-485/RS-422 fullduplex transceivers provide 2500VRMS of galvanic isolation between the RS-485/RS-422 side and the processor or control logic side. These devices allow fast, 1000kbps communication across an isolation barrier when the common-mode voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. Isolation is achieved through integrated high-voltage capacitors. The MAX3535E/MXL1535E also feature a 420kHz transformer driver that allows power transfer to the RS-485 side using an external transformer. The MAX3535E/MXL1535E include one differential driver, one receiver, and internal circuitry to send the RS-485 signals and control signals across the isolation barrier (including the isolation capacitors). The MAX3535E/ MXL1535E RS-485 receivers are 1/8 unit load, allowing up to 256 devices on the same bus. The MAX3535E/MXL1535E feature true fail-safe circuitry. The driver outputs and the receiver inputs are protected from 15kV electrostatic discharge (ESD) on the interface side, as specified in the Human Body Model (HBM). The MAX3535E/MXL1535E feature driver slew-rate select that minimizes electromagnetic interference (EMI) and reduces reflections. The driver outputs are short-circuit and overvoltage protected. Other features are hotswap capability and isolation-barrier fault detection. The MAX3535E operates with a single +3V to +5.5V power supply. The improved secondary supply range of the MAX3535E allows the use of step-down transformers for +5V operation, resulting in considerable power savings. The MXL1535E operates with a single +4.5V to +5.5V power supply. The MXL1535E is a function-/pincompatible improvement of the LTC1535. The MAX3535E/MXL1535E are available over the commercial 0C to +70C and extended -40C to +85C temperature ranges.
Features
2500VRMS RS-485 Bus Isolation Using On-Chip High-Voltage Capacitors 1000kbps Full-Duplex RS-485/RS-422 Communication +3V to +5.5V Power-Supply Voltage Range (MAX3535E) +4.5V to +5.5V Power-Supply Voltage Range (MXL1535E) 1/8 Unit Receiver Load, Allowing 256 Devices on Bus 15kV ESD Protection Using HBM Pin-Selectable Slew-Rate Limiting Controls EMI Hot-Swap-Protected Driver-Enable Input Undervoltage Lockout Isolation-Barrier Fault Detection Short-Circuit Protected Thermal Shutdown Open-Line and Shorted-Line Fail-Safe Receiver Inputs
MAX3535E/MXL1535E
Ordering Information
PART TEMP RANGE PINPACKAGE 28 Wide SO 28 Wide SO 28 Wide SO 28 Wide SO POWERSUPPLY RANGE (V) +3.0 to +5.5 +3.0 to +5.5 +4.5 to +5.5 +4.5 to +5.5
MAX3535ECWI MAX3535EEWI MXL1535ECWI MXL1535EEWI
0C to +70C -40C to +85C 0C to +70C -40C to +85C
Pin Configuration
TOP VIEW
VCC1 1 ST1 2 ST2 3 GND1 4 28 RO1 27 RE 26 DE 25 DI
Applications
Isolated RS-485 Systems Systems with Large Common-Mode Voltages Industrial-Control Local Area Networks Telecommunications Systems
MAX3535E MXL1535E
GND2 11 Z 12 18 SLO 17 RO2 16 A 15 B
Typical Application Circuit appears at end of data sheet.
Y 13 VCC2 14
WIDE SO
PINS 5-10 and 19-24 ARE REMOVED FROM THE PACKAGE
________________________________________________________________ Maxim Integrated Products
1
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
ABSOLUTE MAXIMUM RATINGS
Logic Side--All Voltages Referenced to GND1. VCC1 .........................................................................-0.3V to +6V RE, DE, DI.................................................................-0.3V to +6V RO1, ST1, ST2 ..........................................-0.3V to (VCC1 + 0.3V) Isolated Side--All Voltages Referenced to GND2. VCC2 .........................................................................-0.3V to +8V SLO...........................................................-0.3V to (VCC2 + 0.3V) A, B ......................................................................................14V RO2 .....................-0.3V to the lower of (VCC2 + 0.3V) and +3.4V Y, Z ............................................................................-8V to +13V Digital Outputs Maximum Current RO1, RO2 .....................................................................20mA Y, Z Maximum Current .............................Short-Circuit Protected ST1, ST2 Maximum Current............................................300mA Continuous Power Dissipation (TA = +70C) 28-Pin Wide SO (derate 9.5mW/C above +70C) .................................750mW Operating Temperature Range MXL1535ECWI, MAX3535ECWI .........................0C to +70C MXL1535EEWI, MAX3535EEWI .......................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E)
(VCC1 = +3.0V to +5.5V, VCC2 = +3.13V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +3.3V, VCC2 = +5V, TA = +25C.)
PARAMETER Logic-Side Supply Voltage Logic-Side Supply Current VCC1 Undervoltage-Lockout Falling Trip VCC1 Undervoltage-Lockout Rising Trip LOGIC INPUTS (DI, DE, RE) Input High Voltage, DE, DI, RE Input Low Voltage, DE, DI, RE Logic-Side Input Current, DE, DI LOGIC OUTPUTS (RO1, RE) Receiver-Output High Voltage (RO1) Receiver-Output Low Voltage (RO1) Receiver-Output (RO1) Leakage Current RE Low Output Current for Fault Detect VRO1H VRO1L IOZR IOL ISOURCE = 4mA, VCC1 = +4.5V ISOURCE = 4mA, VCC1 = +3V ISINK = 4mA, VCC1 = +4.5V ISINK = 4mA, VCC1 = +3V RE = high, VCC1 = +5.5V, 0 VRO1 VCC1 RE = +0.4V, fault not asserted 40 60 3.7 2.4 0.4 0.4 1 80 V V A A VIH VIL IINC VIH is measured with respect to GND1 VIL is measured with respect to GND1 2.0 0.8 2 V V A SYMBOL VCC1 ICC1 Transformer not driven, ST1 and ST2 unconnected, RE = low, DE = high, fDATA = 0, RO1 = no load 2.53 2.63 CONDITIONS MIN 3.0 5.9 TYP MAX 5.5 13 UNITS V mA
LOGIC-SIDE SUPPLY (VCC1, GND1)
VUVL1 VUVH1
2.69 2.80
2.85 2.97
V V
2
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E) (continued)
(VCC1 = +3.0V to +5.5V, VCC2 = +3.13V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +3.3V, VCC2 = +5V, TA = +25C.)
PARAMETER RE High Output Current for Fault Detect TRANSFORMER DRIVER (ST1, ST2) DC-Converter Switching Frequency (ST1, ST2) DC-Converter Total Impedance ROH + ROL (ST1, ST2) ST1, ST2 Duty Cycle ISOLATED-SIDE SUPPLY (VCC2, GND2) Isolated-Side Supply Voltage Isolated-Side Supply Current VCC2 ICC2 fDATA = 0, SLO floating, RO2 = no load, A, B floating, Figure 1 RL = 27 RL = 2.68 2.77 3.13 56 10 2.85 2.95 7.50 70 mA 16 3.02 3.13 V V V fSW ROHL ST1, ST2, not loaded VCC1 = +4.5V, Figure 13 VCC1 = +3V, Figure 13 ST1, ST2, not loaded 44 290 460 1.6 1.8 50 590 2.6 2.9 56 kHz % SYMBOL IOH CONDITIONS RE = VCC1 - 0.5V, fault asserted MIN -140 TYP -100 MAX -60 UNITS A
MAX3535E/MXL1535E
VCC2 Undervoltage-Lockout Falling Trip VCC2 Undervoltage-Lockout Rising Trip DRIVER OUTPUTS (Y, Z) Driver-Output High Voltage
VUVL2 VUVH2
VDOH
No load, VDOH is measured with respect to GND2 RL = 50 (RS-422), VCC2 = +3.13V, Figure 1 2.0 1.5 1.0 2.35
4
V
Differential Driver Output
VOD
V RL = 27 (RS-485), VCC2 = +3.13V, Figure 1 RL = 27 or 50, VOC is measured with respect to GND2, Figure 1 RL = 27 or 50, Figure 1 1.95 3.0 V
Driver Common-Mode Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States
VOC
VOD
0.2
V
VOC
RL = 27 or 50, Figure 1 Driver enabled (DE =1 ) DI = high, VY > -7V DI = low, VZ > -7V
0.2
V
-250 mA
Driver Short-Circuit Output Current
IOSD Driver enabled (DE =1 ) DI = high, VZ < +12V DI = low, VY < +12V +250
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E) (continued)
(VCC1 = +3.0V to +5.5V, VCC2 = +3.13V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C, VCC1 = +3.3V, VCC2 = +5V).
PARAMETER SYMBOL CONDITIONS DI = high -7V < VY < min[(VCC2 - 1V) +2V] Driver Short-Circuit Foldback Output Current Driver enabled (DE =1) DI = low -7V < VZ < min[(VCC2 - 1V) +2V] DI = high +1V < VZ < +12V DI = low +1V < VY < +12V SLEW-RATE SELECT (SLO) Input High Voltage SLO Input Low Voltage SLO SLO Pullup Resistor RECEIVER INPUTS (A, B) Receiver Input Current Receiver Differential Threshold Voltage Receiver-Input Hysteresis Receiver-Input Resistance Receiver-Input Open Circuit Voltage RECEIVER OUTPUT (RO2) Receiver-Output (RO2) High Voltage Receiver-Output (RO2) Low Voltage ISOLATION Isolation Voltage (Notes 2, 3) Isolation Resistance Isolation Capacitance ESD Protection VISO RISO CISO 60s 1s TA = +25C, VISO = 50V (Note 3) TA = +25C Human Body Model (A, B, Y, Z) 2500 3000 100 10,000 2 15 VRMS M pF kV VRO2H VRO2L ISOURCE = 4mA, VCC2 = +3.13V ISINK = 4mA, VCC2 = +3.13V 2.4 0.4 V V IAB VTH VTH RIN VOAB VA or VB = +12V VA or VB = -7V -7V VCM +12V -7V VCM +12V, TA = 0C to +70C -7v VCM +12V, TA = -40C to +85C -7V VCM +12V (Note 1) -200 10 5 96 2.6 -90 30 30 +125 -100 -10 70 70 200 A mV mV k V VIHS VILS RSLO VIHS is measured with respect to GND2 VILS is measured with respect to GND2 VSLO = +3V 100 3.0 1.0 V V k MIN TYP MAX UNITS
-25 A +25
IOSFD
4
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
SWITCHING ELECTRICAL CHARACTERISTICS (MAX3535E)
(VCC1 = +3.0V to +5.5V, VCC2 = +3.13V to +7.5V, RL = 27, CL = 50pF, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +3.3V, VCC2 = +5V, TA = +25C.)
PARAMETER Data Sample Jitter Maximum Data Rate Self-Oscillating Frequency Driver-Differential Output Delay Time Driver-Differential Output Transition Time Driver-Output Enable Time Driver-Output Disable Time Receiver-Propagation Delay Time to RO1 Receiver-Propagation Delay Time to RO2 RO1, RO2 Rise or Fall Time Receiver-Output Enable Time RO1 Receiver-Output Disable Time RO1 Initial Startup Time (from Internal Communication Fault) Internal Communication Timeout Fault Time SYMBOL tJ fDATA fSOS tDD tTD tPZL, tPZH tPHZ, tPLZ tPLH1, tPHL1 tPLH2, tPHL2 tR, tF tZL,tZH tLZ,tHZ Figure 6 tJ = 25% of data cell, receiver and driver, SLO = high (Note 4) SLO = high, Figure 5 SLO = low, Figure 5 SLO = high, Figures 2, 6 SLO = low, Figures 2, 6 SLO = high, Figures 2, 6 SLO = low, Figures 2, 6 SLO = high, DI = high or low, Figures 3, 7 SLO = high, DI = high or low, Figures 3, 7 Figures 4, 8 Figures 4, 8 Figures 4, 8 Figures 4, 9 Figures 4, 9 (Note 5) (Note 5) 120 877 250 200 CONDITIONS MIN TYP 220 1136 450 375 490 850 30 220 730 720 440 40 40 30 30 1200 1200 855 1560 100 1000 1400 1300 855 MAX 285 UNITS ns kbps kHz ns ns ns ns ns ns ns ns ns ns ns
MAX3535E/MXL1535E
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
ELECTRICAL CHARACTERISTICS (MXL1535E)
(VCC1 = +4.5V to +5.5V, VCC2 = +4.5V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25C.)
PARAMETER Logic-Side Supply Voltage Isolated-Side Supply Voltage Logic-Side Supply Current SYMBOL VCC1 VCC2 ICC1 Transformer not driven, ST1 and ST2 unconnected, RE = low, DE = high, fDATA = 0, RO1 = no load fDATA = 0, SLO floating, RO2 = no load, A, B floating, Figure 1 RL = 27 RL = 2.0 1.5 CONDITIONS MIN 4.5 4.5 5.9 TYP MAX 5.5 7.5 13 UNITS V V mA
56 10 3.0 2.5
70 mA 16 V 5.0 V V
Isolated-Side Supply Current
ICC2
Differential Driver Output Driver Output High Voltage Driver Common-Mode Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States
VOD VDOH VOC
RL = 50 (RS-422), VCC2 = +4.5V, Figure 1 RL = 27 (RS-485), VCC2 = +4.5V, Figure 1 No load, VDOH is measured with respect to GND2 RL = 27 or 50, VOC is measured with respect to GND2, Figure 1 RL = 27 or 50, Figure 1
1.0
3.0
VOD
0.2
V
VOC
RL = 27 or 50, Figure 1 Driver enabled (DE =1) DI = high, VY > -7V DI = low, VZ > -7V
0.2
V
-250 mA
Driver Short-Circuit Output Current
IOSD Driver enabled (DE =1) DI = high, VZ < +12V DI = low, VY < + 12V Driver enabled (DE =1) DI = high -7V < VY < min[(VCC2 - 1V) +2V] DI = low -7V < VZ < min[(VCC2 - 1V) +2V] IOSFD Driver enabled (DE =1) DI = high +1V < VZ < +12V DI = low +1V < VY < +12V +250
-25
Driver Short-Circuit Foldback Output Current
mA
+25
6
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
ELECTRICAL CHARACTERISTICS (MXL1535E) (continued)
(VCC1 = +4.5V to +5.5V, VCC2 = +4.5V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25C.)
PARAMETER Input High Voltage, DE, DI, RE Input High Voltage, SLO Input Low Voltage, DE, DI, RE Input Low Voltage, SLO Logic-Side Input Current, DE, DI Receiver Input Current Receiver Differential Threshold Voltage SYMBOL VIH VIHS VIL VILS IINC IAB VTH VA or VB = +12V VA or VB = -7V -7V VCM +12V -7V VCM +12V, TA = 0C to +70C Receiver-Input Hysteresis VTH -7V VCM +12V, TA = -40C to +85C Receiver-Input Resistance Receiver-Input Open-Circuit Voltage Receiver-Output High Voltage (RO1) Receiver-Output Low Voltage (RO1) Driver-Output Leakage Current Driver-Output Leakage Current Receiver-Output (RO2) High Voltage Receiver-Output (RO2) Low Voltage DC-Converter Switching Frequency (ST1, ST2) RIN VOAB VRO1H VRO1L IOZ IOZ VRO2H VRO2L fSW ISOURCE = 4mA, VCC1 = +4.5V ISINK = 4mA, VCC1 = +4.5V DE = low -7V < VY < +12V, -7V < VZ < +12V DE = low -7V < VY < +12V, -7V < VZ < +12V ISOURCE = 4mA, VCC2 = +4.5V ISINK = 4mA, VCC2 = +4.5V ST1, ST2 not loaded 290 2.8 3.7 -7V VCM +12V (Note 1) 5 96 30 140 2.6 4.3 0.4 30 30 3.4 0.4 460 0.8 590 100 0.8 70 200 k V V V A A V V kHz -200 10 -90 30 CONDITIONS VIH is measured with respect to GND1 VIHS is measured with respect to GND2 VIL is measured with respect to GND1 VILS is measured with respect to GND2 MIN 2.0 4.0 TYP 1.45 2.1 1.45 2.1 0.8 1.0 2 +0.25 -0.20 -10 70 mV MAX UNITS V V V V A mA mV
MAX3535E/MXL1535E
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
ELECTRICAL CHARACTERISTICS (MXL1535E) (continued)
(VCC1 = +4.5V to +5.5V, VCC2 = +4.5V to +7.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25C.)
PARAMETER DC-Converter Impedance High ST1, ST2 DC-Converter Impedance Low ST1, ST2 RE Low Output Current for Fault Detect RE High Output Current for Fault Detect VCC2 Undervoltage-Lockout Falling Trip VCC2 Undervoltage-Lockout Rising Trip VCC1 Undervoltage-Lockout Falling Trip VCC1 Undervoltage-Lockout Rising Trip Isolation Voltage (Note 2) SLO Pullup Resistor SYMBOL ROH ROL IOL IOH VUVL2 VUVH2 VUVL1 VUVH1 VISO RSLO 60s 1s VSLO = +3V Figure 13 Figure 13 RE = sink current, RE = +0.4V, fault not asserted RE = source current, RE = +VCC1 - 0.5V, fault asserted -40 60 2.68 2.77 2.53 2.63 2500 3000 100 CONDITIONS MIN TYP 4 2.5 -50 100 2.85 2.95 2.69 2.80 MAX 6 5 -80 140 3.02 3.13 2.85 2.97 UNITS A A V V V V VRMS k
8
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
SWITCHING ELECTRICAL CHARACTERISTICS (MXL1535E)
(VCC1 = +4.5V to +5.5V, VCC2 = +4.5V to +7.5V, RL = 27, CL = 50pF, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25C.)
PARAMETER Data Sample Jitter Max Baud Rate Driver-Differential Output Delay Time Driver-Differential Output Transition Time Driver-Output Enable Time Driver-Output Disable Time Receiver-Propagation Delay Time to RO1 Receiver-Propagation Delay Time to RO2 RO1, RO2 Rise or Fall Time Receiver-Output Enable Time RO1 Receiver-Output Disable Time RO1 Initial Startup Time (from Internal Communication Fault) Internal Communication Timeout Fault Time ST1, ST2 Duty Cycle ESD Protection SYMBOL tJ fMAX tDD tTD tPZL, tPZH tPHZ, tPLZ tPLH1, tPHL1 tPLH2, tPHL2 tR, tF tZL, tZH tLZ,tHZ Figure 6 SLO = high, Figure 5, (Note 6) SLO = high, Figures 2, 6 SLO = low, Figures 2, 6 SLO = high, VCC2 = +4.5V SLO = low, VCC2 = +4.5V SLO = high, DI = high or low, Figure 3, 7 SLO = high, DI = high or low, Figures 3, 7 Figures 4, 8 Figures 4, 8 Figures 4, 8 Figures 4, 9 Figures 4, 9 (Note 5) (Note 5) 0C to +70C -40C to +85C Human Body Model (A, B, Y, Z) 15 150 250 CONDITIONS MIN TYP 220 450 430 850 45 260 730 720 440 40 40 30 30 1200 1200 56 57 855 1560 100 1000 1400 1300 855 MAX 285 UNITS ns kBd ns ns ns ns ns ns ns ns ns ns ns % kV
MAX3535E/MXL1535E
Receiver inputs are 96k minimum resistance, which is 1/8 unit load. 60s test result is guaranteed by correlation from 1s result. VISO is the voltage difference between GND1 and GND2. The maximum data rate is specified using the maximum jitter value according to the formula: data rate = 1 / (4tJ). See the Skew section for more information. Note 5: Initial startup time is the time for communication to recover after a fault condition. Internal communication timeout fault time is the time before a fault is indicated on RE, after internal communication has stopped. Note 6: Bd = 2 bits. Note 1: Note 2: Note 3: Note 4:
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Typical Operating Characteristics
(VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.)
ICC1 SUPPLY CURRENT vs. TEMPERATURE
MAX3535E toc01
ICC1 SUPPLY CURRENT vs. TEMPERATURE
MAX3535E toc02
ICC2 SUPPLY CURRENT vs. TEMPERATURE
fDATA = 700kbps SLO = LOW RL = 27 VCC2 = +6V
MAX3535E toc03
100 HALO TGM-250NS 1:1:1 TRANSFORMER RL = 27
100 VCC1 = +3.3V 80 HALO TGM-240NS 1:1.3:1.3 TRANSFORMER RL = 27 ICC1 (mA) RL = 60 40 RL = OPEN 20
80
80
70
ICC1 (mA)
RL = 60 40 RL = OPEN 20 FIGURE 1 0 -40 -15 10 35 60 85 TEMPERATURE (C)
ICC2 (mA)
60
60
60
50
VCC2 = +3.9V (MAX3535E)
40 FIGURE 1 FIGURE 1 30 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C) VCC2 = +3.13V (MAX3535E)
0
VCC2 SUPPLY VOLTAGE vs. TEMPERATURE
MAX3535E toc04
SELF-OSCILLATION FREQUENCY vs. TEMPERATURE
MAX3535E toc05
DRIVER DIFFERENTIAL OUTPUT TRANSITION TIME vs. TEMPERATURE
90 80 70 RL = 27 SLO = VCC2
MAX3535E toc06
7.0 6.5 6.0 VCC2 (V) 5.5 5.0 4.5 4.0 3.5 3.0 -40 -15 10 35 TEMPERATURE (C) RL = 27, VCC1 = +3V (MAX3535E) FIGURE 1 60 RL = OPEN, VCC1 = +5V RL = 27, VCC1 = +5V HALO TGM-240NS 1:1.3:1.3 TRANSFORMER
500 SLO = HIGH 450 VCC1 = VCC2 RL = 27
100
fSOS (kHz)
tTD (ns)
400 SLO = LOW 350
60 50 40 30 VCC2 = +5V VCC2 = +3.13V (MAX3535E)
300 FIGURE 5 250 85 -40 -15 10 35 60 85 TEMPERATURE (C)
20 10 0 -40 -15 10
FIGURES 2, 6 35 60 85
TEMPERATURE (C)
DRIVER DIFFERENTIAL OUTPUT TRANSITION TIME vs. TEMPERATURE
RL = 27 SLO = GND2
MAX3535E toc07
SWITCHER FREQUENCY vs. TEMPERATURE
MAX3535E toc08
SWITCHER FREQUENCY vs. SUPPLY VOLTAGE
MAX3535E toc09
800 700 600
600 550 500 fSW (kHz)
600 550 500 fSW (kHz) 450 400 350 300
tTD (ns)
500 400 VCC2 = +5V 300 VCC2 = +3.13V (MAX3535E) 200 -40 -15 10 35 FIGURES 2, 6 60 85
450 400 350 300 -40 -15 10 35 60 85 TEMPERATURE (C)
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (C)
VCC1 (V)
10
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+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Typical Operating Characteristics (continued)
(VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.)
RECEIVER-OUTPUT (RO1) LOW VOLTAGE vs. TEMPERATURE
MAX3535E toc10
RECEIVER-OUTPUT (RO1) HIGH VOLTAGE vs. TEMPERATURE
MAX3535E toc11
DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. DIFFERENTIAL OUTPUT CURRENT
DE = HIGH 3.5 3.0 VCC2 = +3.9V (MAX3535E)
MAX3535E toc12
1.0 ISINK = 4mA 0.8
5.0 4.5 4.0 VCC1 = +5V VCC1 = +4.5V
4.0
VRO1L (V)
VRO1H (V)
3.5 3.0 2.5 VCC1 = +3V (MAX3535E) -40 -15 10 35
VOD (V)
0.6
2.5 2.0 1.5 1.0 VCC2 = +7.5V ISOURCE = 4mA 60 85 0.5 0 0 20 40 60 80 100 120 TEMPERATURE (C) DRIVER DIFFERENTIAL OUTPUT CURRENT (mA) VCC2 = +3.13V (MAX3535E)
0.4 VCC1 = +4.5V 0.2
VCC1 = +3V (MAX3535E)
0 -40 -15 10
VCC1 = +5V 35 60 85 TEMPERATURE (C)
2.0
DRIVER-OUTPUT HIGH VOLTAGE vs. DRIVER SOURCE CURRENT
MAX3535E toc13
DRIVER-OUTPUT LOW VOLTAGE vs. DRIVER SINK CURRENT
12 11 10 9 8 VDOL (V) VCC2 = +3.9V (MAX3535E) VCC2 = +3.13V (MAX3535E) VOD (V) 7 6 5 4 3 2 1 0 0 DE = HIGH
MAX3535E toc14
DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. VCC2 SUPPLY VOLTAGE
RL = 27 2.6 2.4 2.2 2.0 1.8 FIGURE 1 1.6
MAX3535E toc15
5 4 3 2 VDOH (V) 1 0 -1 -2 -3 -4 -5 -6 -7 0 VCC2 = +3.13V (MAX3535E)
DE = HIGH
2.8
VCC2 = +7.5V
VCC2 = +7.5V VCC2 = +3.9V (MAX3535E) 20 40 60 80 100 120
20
40
60
80
100
120
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 VCC2 (V)
DRIVER SOURCE CURRENT (mA)
DRIVER SINK CURRENT (mA)
RECEIVER OUTPUT (RO1) VOLTAGE vs. LOAD CURRENT
MAX3535E toc16
DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE
MAX3535E toc17
ICC1 SUPPLY CURRENT vs. VCC1 SUPPLY VOLTAGE
9 8 7 ICC1 (mA) RL = OPEN TRANSFORMER IS NOT DRIVEN
MAX3535E toc18
5 OUTPUT HIGH, SOURCING 4 OUTPUT VOLTAGE (V)
5 RL = 27 SLO = GND2 4 VCC2 = +7.5V VOD (V) VCC2 = +6V
10
3
3
6 5 4 3
2
2 VCC2 = +3.13V (MAX3535E) FIGURE 1 0 0 5 10 15 -40 -15 10 35 60 85 LOAD CURRENT (mA) TEMPERATURE (C)
1 OUTPUT LOW, SINKING 0
1
2 1 0 3.0 3.5 4.0 4.5 5.0 5.5 VCC1 SUPPLY VOLTAGE (V)
______________________________________________________________________________________
11
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Typical Operating Characteristics (continued)
(VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.)
RECEIVER (RO1) PROPAGATION DELAY (tPLH1)
MAX3535E toc19
DRIVER PROPAGATION DELAY (SLO = LOW)
MAX3535E toc20
DRIVER PROPAGATION DELAY (SLO = HIGH)
MAX3535E toc21
A-B 1V/div
DI 2V/div
DI 2V/div
Y 2V/div RO 1V/div Z 2V/div
Y 2V/div
Z 2V/div
100ns/div
400ns/div
400ns/div
JITTER vs. TEMPERATURE
MAX3535E toc22
DRIVER ENABLE TIME PLUS JITTER
MAX3535E toc23
300
280
DE 2V/div
tJ (ns)
260 Y 2V/div
240 VCC1 = 3.13V 220 VCC1 = 5.5V 200 -40 -15 10 35 60 85 200ns/div TEMPERATURE (C)
DRIVER DISABLE TIME PLUS JITTER
MAX3535E toc24
RECEIVER (RO1) PROPAGATION DELAY (tPHL1)
MAX3535E toc25
DE 2V/div
A-B 1V/div
Y 2V/div
RO 1V/div
200ns/div
100ns/div
12
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
Pin Description
PIN 1 2 3 4 5-10, 19-24 11 12 13 14 15 16 17 NAME VCC1 ST1 ST2 GND1 -- GND2 Z Y VCC2 B A RO2 ISOLATION SIDE Logic Logic Logic Logic -- Isolated Isolated Isolated Isolated Isolated Isolated Isolated FUNCTION Logic-Side/Transformer-Driver Power Input. Bypass VCC1 to GND1 with 10F and 0.1F capacitors. Transformer-Driver Phase 1 Power Output. Connect ST1 to isolation-transformer primary to send power to isolation side of barrier. Transformer-Driver Phase 2 Power Output. Connect ST2 to isolation-transformer primary to send power to isolation side of barrier. Logic-Side Ground. For isolated operation do not connect to GND2. Removed from Package Isolation-Side Ground. For isolated operation do not connect to GND1. RS-485/RS-422 Inverting Driver Output. Output floats when DE is low or in a barrier fault event. (See the Detailed Description section for more information.) RS-485/RS-422 Noninverting Driver Output. Output floats when DE is low or in a barrier fault event. (See the Detailed Description section for more information.) Isolated-Side Power Input. Connect VCC2 to the rectified output of transformer secondary. Bypass VCC2 to GND2 with 10F and 0.1F capacitors. RS-485/RS-422 Differential-Receiver Inverting Input RS-485/RS-422 Differential-Receiver Noninverting Input Isolated-Side Receiver Output. RO2 is always enabled. RO2 goes high if A - B > -10mV. RO2 goes low if A - B < -200mV. Fail-safe circuitry causes RO2 to go high when A and B float or are shorted. Driver Slew-Rate Control Logic Input. Connect SLO to GND2 for data rates up to 400kbps. Connect SLO to VCC2 or leave floating for high data rates. Driver Input. Pull DI low (high) to force driver output Y low (high) and driver output Z high (low). Driver-Enable Input. The driver outputs are enabled and follow the driver input (DI) when DE is high. When DE is floated, the driver is disabled. DE does not affect whether the receiver is on or off. Receiver-Output Enable and Fault Current Output. The receiver output (RO1) is enabled and follows the differential-receiver inputs, A and B, when RE is low, otherwise RO1 floats. RE does not affect RO2 and does not disable the driver. The asserted fault output is a pullup current, otherwise RE shows a pulldown current. Receiver Output. RO1 is enabled when RE is low. RO1 goes high if A - B > -10mV. RO1 goes low if A - B < -200mV. Fail-safe circuitry causes RO1 to go high when A and B float or are shorted.
MAX3535E/MXL1535E
18 25
SLO DI
Isolated Logic
26
DE
Logic
27
RE
Logic
28
RO1
Logic
______________________________________________________________________________________
13
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Test Circuits
Y RL VOD RL VOC
VCC2 500 Y/Z CL GND2 500
Z
Figure 1. Driver DC Test Load
HIGH
Figure 3. Driver Timing Test Load
VCC1/VCC2
DE Y DI Z
RL
CL RO1/RO2 CL
1k 1k
RL GND
CL
GND2 GND1/GND2
Figure 2. Driver Timing Test Circuit
TGM-240
Figure 4. Receiver Timing Test Load
1/2 BAT54C CONTROL GROUND 10F 0.1F
RS485 GROUND
1/2 BAT54C
+3.0V TO +5.5V VCC1 0.1F 10F RO1
ST1
ST2 TRANSFORMER DRIVER
GND2 VOLTAGE REGULATOR
VCC2
A B RE DE DRIVER DI Y Z VCC2 CL CL 2RL RECEIVER RO2
GND1
MAX3535E
BARRIER TRANSCEIVER
BARRIER TRANSCEIVER
SLO
ISOLATION BARRIER
Figure 5. Self-Oscillating Configuration 14 ______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
Switching Waveforms
MAX3535E/MXL1535E
DI
1.5V
tR < 10ns, tF < 10ns
1.5V
tR < 10ns, tF < 10ns V A - VB 0V INPUT tPHL1 tPLH1 0V
tDD
tDD
tPLH1 VRO1H/2
Z VDOH Y 1/2 VDOH VDOH 0V -VDOH tTD tJ 20% 80% VOD = VY - VZ
VRO1H RO1 VRO1L RO2 80% 20% tTD tPLH2 tF tR tJ 80% 20% 20% VRO1H/2 OUTPUT tJ 80%
tPLH2
Figure 6. Driver Propagation Delay
Figure 8. Receiver Propagation Delays
tR < 10ns, tF < 10ns DE 1.5V 1.5V RE 1.5V tR < 10ns, tF < 10ns tPZL VDOH Y, Z VDOL VDOH/2 OUTPUT NORMALLY LOW VDOL + 0.5V VRO1H RO1 VRO1L VDOH Y, Z 0V tPZH 2 x tJ tPHZ tJ VDOH/2 OUTPUT NORMALLY LOW VRO1L + 0.5V tPLZ tZL tLZ 1.5V
OUTPUT NORMALLY HIGH VDOH - 0.5V
VRO1H RO1 0V tZH
OUTPUT NORMALLY HIGH VRO1H - 0.5V tHZ
Figure 7. Driver Enable and Disable Times
Figure 9. Receiver Enable and Disable Times
______________________________________________________________________________________
15
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Detailed Description
The MAX3535E/MXL1535E isolated RS-485/RS-422 fullduplex transceivers provide 2500VRMS of galvanic isolation between the RS-485/RS-422 isolation side and the processor or logic side. These devices allow fast, 1000kbps communication across an isolation barrier even when the common-mode voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. The isolation barrier consists of two parts. The first part is a capacitive isolation barrier (integrated highvoltage capacitors) that allows data transmission between the logic side and the RS-485/RS-422 isolation side. Data is sampled and encoded before it is transmitted across the isolation barrier introducing sampling jitter and further delay into the communication system. The second part of the isolation barrier consists of an external transformer with the required primary-to-secondary isolation, allowing the transmission of operating power from the logic side across the isolation barrier to the isolation side. Connect the primary of the external transformer to the MAX3535E/MXL1535E's 420kHz transformer driver outputs ST1 and ST2. Since the MXL1535E and the MAX3535E operate with different supply-voltage requirements at their respective isolated and logic sides, different isolation transformers must be used with each device (see the Transformer Selection section). The only external components needed to complete the system are the isolation transformer, two diodes, and two low-voltage, 10F decoupling capacitors (see the Typical Application Circuit). The MAX3535E/MXL1535E include one differential driver, one receiver, and internal circuitry to send the RS485 signals and logic signals across the isolation barrier (including the isolation capacitors). The MAX3535E/ MXL1535E receivers are 1/8 unit load, allowing up to 256 devices on a single bus. The MAX3535E/MXL1535E feature fail-safe circuitry ensuring the receiver output maintains a logic-high state when the receiver inputs are open or shorted, or when connected to a terminated transmission line with all drivers disabled (see the Fail-Safe section). The MAX3535E/MXL1535E feature driver slew-rate select that minimizes electromagnetic interference (EMI) and reduces reflections caused by improperly terminated cables at data rates below 400kbps. The driver outputs are short-circuit protected for sourcing or sinking current and have overvoltage protection. Other features include hot-swap capability, which holds the driver off if the driver logic signals are floated after power is applied. The MAX3535E/MXL1535E have error-detection circuitry that alerts the processor when there is a fault and disables the driver until the fault is removed.
Fail Safe
The MAX3535E/MXL1535E guarantee a logic-high receiver output when the receiver inputs are shorted or open, or when connected to a terminated transmission line with all drivers disabled. The receiver threshold is fixed between -10mV and -200mV. If the differential receiver input voltage (A - B) is greater than or equal to -10mV, RO1 is logic-high (Table 2). In the case of a terminated bus with all transmitters disabled, the receiver's differential input voltage is pulled to zero by the termination. Due to the receiver thresholds of the MAX3535E/MXL1535E, this results in a logic-high at RO1 with a 10mV minimum noise margin.
Driver Output Protection
Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the entire common-mode voltage range. The second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature exceeds +150C.
Monitoring Faults on RE
RE functions as both an input and an output. As an input, RE controls the receiver output enable (RO1). As an output, RE is used to indicate when there are faults associated with the operation of the part. This dual functionality is made possible by using an output driver stage that can easily be overdriven by most logic gates. When an external gate is not actively driving RE, it is driven either high using a 100A internal pullup current (fault present), or low using a 60A internal pulldown current (no fault). When using RE to control the receiver-enable output function, be sure to drive it using a gate that has enough sink and source capability to overcome the internal drive.
16
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
When not actively driving RE, it functions as the fault indicator (Table 3). A low on RE indicates the part is functioning properly, while a high indicates a fault is present. The four causes of a fault indication are: 1) The voltage on VCC1 is below its undervoltage-lockout threshold (2.69V nominal) 2) The voltage on VCC2 is below its undervoltage-lockout threshold (2.80V nominal) 3) There is a problem that prevents the MAX3535E/ MXL1535E from communicating across its isolation barrier 4) The die temperature exceeds +150C nominally, causing the part to go into thermal shutdown When a fault occurs, RO1 is switched to a logic-high state if RE is low (Table 3). Open-circuit or short-circuit conditions on the receiver inputs do not generate fault conditions; however, any such condition also puts RO1 in a logic-high state (see the Fail Safe section). Read RE for fault conditions by using a bidirectional microcontroller I/O line or a tri-stated buffer as shown in Figure 10. When using a tri-stated buffer, enable the driver whenever the voltage on RE needs to be forced to a logic-high or logic-low. To read RE for a fault condition, disable the driver.
MAX3535E/MXL1535E
Slew-Rate Control Logic
The SLO input selects between a fast and a slow slew rate for the driver outputs. Connecting SLO to GND2 selects the slow slew-rate option that minimizes EMI and reduces reflections caused by improperly terminated cables at data rates up to 400kbps. This occurs because lowering the slew rate decreases the rise and fall times for the signal at the driver outputs, drastically reducing the high-frequency components and harmonics at the output. Floating SLO or connecting it to VCC2 selects the fast slew rate, which allows high-speed operation.
TRI-STATED BUFFER/ BIDIRECTIONAL MICROCONTROLLER I/O RO1 RE
VCC1
VCC1
D
RE
OE
DRIVER OUTPUT BECOMES HIGH IMPEDANCE OE DE FAULT
MAX3535E MXL1535E
FAULT
FAULT DETECTED R DI GND1
Figure 10. Reading a Fault Condition
______________________________________________________________________________________
17
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Functional Tables
Table 1. Transmitting Logic
TRANSMITTING LOGIC INPUTS DE 1 1 0 DI 1 0 X Y 1 0 High impedance OUTPUTS Z 0 1 High impedance
Table 2. Receiving Logic
RECEIVING LOGIC INPUTS RE 0 0 0 1 1 1 VA - VB >-10mV <-200mV Inputs open/shorted >-10mV <-200mV Inputs open/shorted RO1 1 0 1 High impedance High impedance High impedance OUTPUTS RO2 1 0 1 1 0 1
Table 3. Fault Mode
NORMAL MODE FUNCTION VCC1 > VUVH1 VCC2 > VUVH2 Transformer driver (ST1, ST2) RE = 0 RO1 RE = VCC1 RE = floating RO2 Driver outputs (Y, Z) Internal barrier communication Fault indicator on RE VCC1 < VUVL1 VCC2 > VUVH2 VCC1 > VUVH1 VCC2 < VUVL2 VCC1 < VUVL1 VCC2 < VUVL2 THERMAL SHUTDOWN FAULT MODES INTERNAL COMMUNICATION FAULT
On Active High impedance Active Active Active Active Low (60A pulldown)
On High High impedance High impedance Active High impedance Disabled High (100A pullup)
On High High impedance High impedance Active High impedance Disabled High (100A pullup)
On High High impedance High impedance Active High impedance Disabled High (100A pullup)
Off High High impedance High impedance Active High impedance Disabled High (100A pullup)
On High High impedance High impedance Active High impedance Communication attempted High (100A pullup)
18
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
Applications Information
Typical Applications
The MAX3535E/MXL1535E transceivers facilitate bidirectional data communications on multipoint bus transmission lines. Figure 11 shows a typical RS-485 multidrop-network applications circuit. Figure 12 shows the MAX3535E/MXL1535E functioning as line repeaters with cable lengths longer than 4000ft. To minimize reflections, terminate the line at both ends in its characteristic impedance. Keep stub lengths off the main line as short as possible.
MAX3535E/MXL1535E
B 120 A A B A B R D
DI DE RO
RE
R D RO DE DI
RE
R RE D RO DE DI
TGM-240
1/2 BAT54C CONTROL GROUND 10F 0.1F RS-485 GROUND
1/2 BAT54C
+3.3V VCC1 0.1F 10F RO1
ST1
ST2 TRANSFORMER DRIVER
GND2 VOLTAGE REGULATOR
VCC2
A R RECEIVER B RO2
RE DE
DRIVER D
Y Z 120
DI
VCC2
GND1
MAX3535E
SLO BARRIER TRANSCEIVER BARRIER TRANSCEIVER
ISOLATION BARRIER
Figure 11. Typical Half-Duplex Multidrop RS-485 Network ______________________________________________________________________________________ 19
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
1/2 TGM-250 BAT54C CONTROL GROUND 0.1F 10F
RS-422 GROUND
1/2 BAT54C
VCC2
GND2 TRANSFORMER DRIVER
ST2
ST1 VCC1 10F
+5V
VOLTAGE REGULATOR A 120 B RO2 Y DRIVER R 120 Z D
0.1F MAX488 Y Z A RO R B
D
R RECEIVER
RO1 DI RE DE
D
DI VCC2
SLO
BARRIER TRANSCEIVER
MAX3535E BARRIER MXL1535E TRANSCEIVER
GND1
ISOLATION BARRIER
Figure 12. Using the MAX3535E/MXL1535E as an RS-422 Line Repeater
Transformer Selection
TRANSFORMER DRIVER OUTPUT STAGE VCC1
The MXL1535E is a pin-for-pin compatible upgrade of the LTC1535, making any transformer designed for that device suitable for the MXL1535E (see Table 4). These transformers all have a turns ratio of about 1:1.3CT. The MAX3535E can operate with any of the transformers listed in Table 4, in addition to smaller, thinner transformers designed for the MAX845 and MAX253. The 420kHz transformer driver operates with single primary and center-tapped secondary transformers. When selecting a transformer, do not exceed its ET product, the product of the maximum primary voltage and half the highest period of oscillation (lowest oscillating frequency). This ensures that the transformer does not enter saturation. Calculate the minimum ET product for the transformer primary as: ET = VMAX / (2 x fMIN) where, VMAX is the worst-case maximum supply voltage, and fMIN is the minimum frequency at that supply voltage. Using +5.5V and 290kHz gives a required minimum ET
ROH ST1
ROH ST2
TRANSFORMER PRIMARY ROL ROL
GND1
Figure 13. Transformer Driver Output Stage 20
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
product of 9.5V-s. The commercially available transformers for the MAX845 listed in Table 5 meet that requirement. In most cases, use half of the center-tapped primary winding with the MAX3535E and leave the other end of the primary floating. Most of the transformers in Table 5 are 1:1:1 or 1:1:1:1 turns ratio. For +3.3V operation (+3.6V maximum) the required primary ET product is 6.2V-s. All of the previously mentioned transformers meet this requirement. Table 6 lists some other transformers with step-up turns ratios specifically tailored for +3.3V operation. Most of the transformers in Table 6 are 1:1:1.3:1.3. By using a HALO TGM-010 or Midcom 95061 transformer, it becomes possible to build a complete isolated RS-485/RS-422 transceiver with a maximum thickness less than 0.1in. To minimize power consumption, select the turns ratio of the transformer to produce the minimum DC voltage required at VCC2 (+3.13V) under worst-case, high-temperature, low-VCC1, and full-load conditions. For light loads on the isolated side, ensure that the voltage at VCC2 does not exceed +7.5V. For example, the CTX0114659 transformer results in 85mA (typ) VCC1 supply current with full load on the RS-485 driver. Using a TGM250 1:1:1 transformer lowers the VCC1 supply current to 65mA (typ), while maintaining good margin on the VCC2 supply. A slight step-down transformer can result in extra power savings in some situations. A custom wound sample transformer with 23 primary turns and 20:20 secondary turns on a Ferronics 11-050B core operates well with a VCC1 supply current of 51mA (typ).
MAX3535E/MXL1535E
Table 4. Transformers for the MXL1535E/MAX3535E
MANUFACTURER Cooper Electronic Technologies, Inc. Cooper Electronic Technologies, Inc. EPCOS AG (Germany) (USA) Midcom, Inc. Pulse FEE (France) Sumida Corporation (Japan) Transpower Technologies, Inc. PART NUMBER CTX01-14659 CTX01-14608 B78304-A1477-A3 31160R P1597 S-167-5779 TTI7780-SM ISOLATION VOLTAGE (1s) 500V 3750VRMS 500V 1250V 500V 100V 500V PHONE NUMBER 561-241-7876 561-241-7876 0 89-626-2-80-00 800-888-7724 605-886-4385 33-3-85-35-04-04 03-3667-3320 775-852-0145
Table 5. Transformers for MAX3535E at +5V
MANUFACTURER PART NUMBER TGM-010 HALO Electronics, Inc. TGM-250 TGM-350 TGM-450 BH Electronics, Inc. Coilcraft, Inc. Newport/C&D Technologies Midcom, Inc. PCA Electronics, Inc. Rhombus Industries, Inc. Premier Magnetics, Inc. 500-1749 U6982-C 7825355 7625335 95061 EPC3115S-5 T-1110 PM-SM15 ISOLATION VOLTAGE (1s) 500VRMS 2000VRMS 3000VRMS 4500VRMS 3750VRMS 1500VRMS 1500V 4000V 1250V 700V DC 1800VRMS 1500VRMS 952-894-9590 800-322-2645 44-1236-730595 520-295-4300 605-886-4385 818-894-5791 714-898-0960 949-452-0511 www.bhelectronics.com/PDFs/DCDCConverterTransformers.pdf www.coilcraft.com/minitrans.cfm www.dc-dc.com/products/productline.asp?ED=9 www.midcom-inc.com www.pca.com/Datasheets/EPC3117S-X.pdf www.rhombus-ind.com/pt-cat/maxim.pdf www.premiermag.com/pdf/pmsm15.pdf 650-903-3800 www.haloelectronics.com/6pin.html PHONE NUMBER WEBSITE
______________________________________________________________________________________
21
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Table 6. Transformers for MAX3535E at +3.3V
MANUFACTURER PART NUMBER TGM-040 HALO Electronics, Inc. TGM-240 TGM-340 TGM-340 BH Electronics, Inc. Coilcraft, Inc. Newport/C&D Technologies Midcom, Inc. PCA Electronics, Inc. Rhombus Industries, Inc. Premier Magnetics Inc. 500-2582 Q4470-C 78253335 76253335 95062 95063 EPC3115S-2 T-1107 PM-SM16 ISOLATION VOLTAGE (1s) 500VRMS 2000VRMS 3000VRMS 4500VRMS 2000VRMS 1500VRMS 1500V 4000V 1250V 1250V 700V DC 1800VRMS 1500VRMS 952-894-9590 800-322-2645 44-1236-730595 520-295-4300 605-886-4385 818-894-5791 714-898-0960 949-452-0511 www.bhelectronics.com/PDFs/DCDCConverterTransformers.pdf www.coilcraft.com/minitrans.cfm www.dc-dc.com/products/productline.asp?ED=9 www.midcom-inc.com www.pca.com/Datasheets/EPC3117S-X.pdf www.rhombus-ind.com/pt-cat/maxim.pdf www.premiermag.com/pdf/pmsm15.pdf 650-903-3800 www.haloelectronics.com/6pin.html PHONE NUMBER WEBSITE
15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. Maxim's engineers have developed state-of-the-art structures to protect these pins against ESD of 15kV without damage. The ESD structures withstand high ESD in all states. After an ESD event, the MAX3535E/MXL1535E keep working without latchup. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of this product family are characterized for protection to 15kV using the Human Body Model.
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
ESD Test Conditions
The 15kV ESD test specifications apply only to the A, B, Y, and Z I/O pins. The test surge is referenced to GND2. All remaining pins are 2kV ESD protected. Human Body Model Figure 14 shows the Human Body Model, and Figure 15 shows the current waveform it generates when disFigure 14. Human Body ESD Test Model
charged into low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor.
22
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
DATA SKEW vs. DATA RATE
50 45
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
DATA SKEW (%)
40 35 30 25 20 15 10 5 0 0 250 500 750 1000 1250 1500 1750 2000 DATA RATE (kbps) TYP SKEW MAX SKEW
tDL CURRENT WAVEFORM
Figure 15. Human Body Current Waveform
Figure 16. Data Skew vs. Data Rate Graph
Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to simulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.
Higher rates are possible but with more distortion and jitter. The data rate should always be limited below 1.75Mbps for both receiver and driver to avoid interference with the internal barrier communication.
Layout Considerations
The MAX3535E/MXL1535E pin configurations enable optimal PC board layout by minimizing interconnection lengths and crossovers: * For maximum isolation, the isolation barrier should not be breached except by the MAX3535E/MXL1535E and the transformer. Connections and components from one side of the barrier should not be located near those of the other side of barrier. * A shield trace connected to the ground on each side of the barrier can help intercept capacitive currents that might otherwise couple into the DI and SOL inputs. In a double-sided or multilayer board, these shield traces should be present on all conductor layers. * Try to maximize the width of the isolation barrier wherever possible. A clear space of at least 0.25in between GND1 and GND2 is recommended.
Skew
The self-oscillation circuit shown in Figure 5 is an excellent way to get an approximate measure of the speed of the MAX3535E/MXL1535E. An oscillation frequency of 250kHz in this configuration implies a data rate of at least 500kbps for the receiver and transmitter combined. In practice, data can usually be sent and received at a considerably higher data rate, normally limited by the allowable jitter and data skew. If the system can tolerate a 25% data skew, (the difference between tPLH1 and tPHL1), the 285ns maximum jitter specification implies a data rate of 877kbps. Lower data rates result in less distortion and jitter (Figure 16).
______________________________________________________________________________________
23
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection MAX3535E/MXL1535E
Typical Application Circuit
TGM-240 1/2 BAT54C CONTROL GROUND 10F 0.1F
RS-485 GROUND
1/2 BAT54C
+3.3V VCC1 0.1F 10F RO1
ST1
ST2 TRANSFORMER DRIVER
GND2
VCC2
VOLTAGE REGULATOR A B
C
RE DE
RECEIVER
RO2
DRIVER DI
Y Z
VCC2
GND1
MAX3535E
BARRIER TRANSCEIVER
BARRIER TRANSCEIVER
SLO
ISOLATION BARRIER
Chip Information
PROCESS: BiCMOS TRANSISTOR COUNT: 7379
24
______________________________________________________________________________________
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
28L 16L SOIC.EPS
MAX3535E/MXL1535E
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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