Datasheet

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AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

EVALUATION KIT AVAILABLE

General Description

The MAX3535E/MXL1535E isolated RS-485/RS-422 full-

duplex transceivers provide 2500V

RMS

of galvanic isola-

tion 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 integrat-

ed 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 inter-

face 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-cir-

cuit and overvoltage protected. Other features are hot-

swap 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 sav-

ings. The MXL1535E operates with a single +4.5V to

+5.5V power supply. The MXL1535E is a function-/pin-

compatible improvement of the LTC1535. The

MAX3535E/MXL1535E are available over the commer-

cial 0°C to +70°C and extended -40°C to +85°C temper-

ature ranges.

Applications

Isolated RS-485 Systems

Systems with Large Common-Mode Voltages

Industrial-Control Local Area Networks

Telecommunications Systems

Features

♦ 2500V

RMS

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

+3V to +5V, 2500V

RMS

Isolated RS-485/RS-422

Transceivers with ±15kV ESD Protection

RO1

SLO

RO2

CC2

PINS 5–10 and 19–24 ARE REMOVED FROM THE PACKAGE

GND2

GND1

ST2

ST1

CC1

WIDE SO

TOP VIEW

MAX3535E

MXL1535E

PART TEMP RANGE

PIN-

PACKAGE

POWER-

SUPPLY

RANGE

(V)

MAX3535ECWI 0°C to +70°C 28 Wi d e S O

+ 3.0 to + 5.5

MAX3535EEWI -40°C to +85°C 28 Wi d e S O

+ 3.0 to + 5.5

MXL1535ECWI 0°C to +70°C 28 Wi d e S O

+ 4.5 to + 5.5

MXL1535EEWI -40°C to +85°C 28 Wi d e S O+ 4.5 to + 5.5

Pin Configuration

Ordering Information

19-3270; Rev 0; 4/04

Typical Application Circuit appears at end of data sheet.

MAX3535E/MXL1535E

Ordering Information

Summary of content (26 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX3535E/MXL1535E LE AVAILAB +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.
PAGE 2
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection 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 ................................
PAGE 3
MAX3535E/MXL1535E +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 = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +3.3V, VCC2 = +5V, TA = +25°C.) PARAMETER SYMBOL RE High Output Current for Fault Detect CONDITIONS MIN TYP MAX UNITS IOH RE = VCC1 - 0.
PAGE 4
MAX3535E/MXL1535E +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 = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, VCC1 = +3.3V, VCC2 = +5V).
PAGE 5
MAX3535E/MXL1535E +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 = 27Ω, CL = 50pF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +3.3V, VCC2 = +5V, TA = +25°C.
PAGE 6
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection ELECTRICAL CHARACTERISTICS (MXL1535E) (VCC1 = +4.5V to +5.5V, VCC2 = +4.5V to +7.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25°C.) MAX UNITS Logic-Side Supply Voltage PARAMETER VCC1 4.5 5.5 V Isolated-Side Supply Voltage VCC2 4.5 7.
PAGE 7
MAX3535E/MXL1535E +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 = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input High Voltage, DE, DI, RE VIH VIH is measured with respect to GND1 2.0 1.
PAGE 8
MAX3535E/MXL1535E +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 = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25°C.) PARAMETER 8 SYMBOL TYP MAX UNITS Figure 13 4 6 Ω ROL Figure 13 2.5 5 Ω RE Low Output Current for Fault Detect IOL RE = sink current, RE = +0.
PAGE 9
MAX3535E/MXL1535E +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 = 27Ω, CL = 50pF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC1 = +5V, VCC2 = +5V, TA = +25°C.
PAGE 10
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Typical Operating Characteristics (VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.) 80 RL = 27Ω 40 60 RL = 60Ω 40 RL = OPEN FIGURE 1 35 60 85 -40 -15 10 35 60 -40 85 -15 10 60 85 TEMPERATURE (°C) TEMPERATURE (°C) VCC2 SUPPLY VOLTAGE vs. TEMPERATURE SELF-OSCILLATION FREQUENCY vs. TEMPERATURE DRIVER DIFFERENTIAL OUTPUT TRANSITION TIME vs. TEMPERATURE 6.
PAGE 11
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Typical Operating Characteristics (continued) (VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.) 0.4 VCC1 = +3V (MAX3535E) VCC1 = +4.5V VCC1 = +5V 4.0 VCC1 = +4.5V DE = HIGH 3.5 VCC2 = +3.9V (MAX3535E) 2.5 3.5 -15 10 35 VCC2 = +7.5V VCC1 = +3V (MAX3535E) 0.5 ISOURCE = 4mA 0 2.0 85 60 -40 -15 10 35 80 100 120 DRIVER-OUTPUT LOW VOLTAGE vs.
PAGE 12
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Typical Operating Characteristics (continued) (VCC1 = +5V, CL = 50pF (Figure 1), unless otherwise noted.
PAGE 13
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Pin Description PIN NAME ISOLATION SIDE FUNCTION 1 VCC1 Logic Logic-Side/Transformer-Driver Power Input. Bypass VCC1 to GND1 with 10µF and 0.1µF capacitors. 2 ST1 Logic Transformer-Driver Phase 1 Power Output. Connect ST1 to isolation-transformer primary to send power to isolation side of barrier. 3 ST2 Logic Transformer-Driver Phase 2 Power Output.
PAGE 14
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Test Circuits Y VCC2 500Ω RL Y/Z VOC VOD 500Ω CL RL GND2 Z Figure 1. Driver DC Test Load Figure 3. Driver Timing Test Load HIGH VCC1/VCC2 RL DE 1kΩ CL Y DI RO1/RO2 1kΩ CL Z RL GND2 CL GND1/GND2 GND Figure 4. Receiver Timing Test Load Figure 2. Driver Timing Test Circuit TGM-240 1/2 BAT54C CONTROL GROUND 0.1μF 10μF RS-485 GROUND 1/2 BAT54C ST1 +3.0V TO +5.5V ST2 VCC1 0.
PAGE 15
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Switching Waveforms DI tR < 10ns, tF < 10ns 1.5V tR < 10ns, tF < 10ns 1.5V VA - VB 0V 0V INPUT tDD tDD tPHL1 Z tPLH1 tPLH1 VRO1H/2 VRO1H VDOH VRO1H/2 RO1 Y OUTPUT VRO1L 1/2 VDOH RO2 VDOH VOD = VY - VZ 80% 0V 20% -VDOH 80% 80% 80% 20% tTD tJ tJ 20% 20% tPLH2 tPLH2 tTD tF tJ tR Figure 8. Receiver Propagation Delays Figure 6.
PAGE 16
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection 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.
PAGE 17
MAX3535E/MXL1535E +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.
PAGE 18
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Functional Tables Table 1. Transmitting Logic TRANSMITTING LOGIC INPUTS OUTPUTS DE DI Y Z 1 1 1 0 1 0 0 1 0 X High impedance High impedance Table 2.
PAGE 19
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Applications Information 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.
PAGE 20
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection 1/2 TGM-250 BAT54C CONTROL GROUND 10μF 0.1μF RS-422 GROUND 1/2 BAT54C VCC2 GND2 ST2 TRANSFORMER DRIVER VOLTAGE REGULATOR A 120Ω B D +5V ST1 VCC1 10μF MAX488 RO1 R DI RECEIVER DE Y DRIVER 120Ω Y D Z RE RO2 R 0.1μF A RO R B D Z DI VCC2 BARRIER TRANSCEIVER SLO MAX3535E BARRIER MXL1535E TRANSCEIVER GND1 ISOLATION BARRIER Figure 12.
PAGE 21
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection product of 9.5V-µs. 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-µs.
PAGE 22
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Table 6. Transformers for MAX3535E at +3.3V MANUFACTURER PART NUMBER ISOLATION VOLTAGE (1s) TGM-040 500VRMS TGM-240 2000VRMS TGM-340 3000VRMS TGM-340 4500VRMS BH Electronics, Inc. 500-2582 Coilcraft, Inc. Q4470-C HALO Electronics, Inc. Newport/C&D Technologies Midcom, Inc. PCA Electronics, Inc. PHONE NUMBER WEBSITE 650-903-3800 www.haloelectronics.com/6pin.
PAGE 23
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection DATA SKEW vs. DATA RATE 50 45 IP 100% 90% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 40 DATA SKEW (%) Ir AMPERES 36.8% 10% 0 35 30 25 20 15 0 tRL TYP SKEW MAX SKEW 10 TIME 5 tDL CURRENT WAVEFORM 0 0 250 500 750 1000 1250 1500 1750 2000 DATA RATE (kbps) Figure 15. Human Body Current Waveform Figure 16. Data Skew vs.
PAGE 24
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Typical Application Circuit TGM-240 1/2 BAT54C CONTROL GROUND 0.1μF 10μF RS-485 GROUND 1/2 BAT54C ST1 +3.3V ST2 VCC1 0.
PAGE 25
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Package Information 28L 16L SOIC.EPS (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.
PAGE 26
MAX3535E/MXL1535E +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed.