MAX3535E/MXL1535E

Logic Side-All Voltages Referenced to GND1.
V_CC1.........................................................................-0.3V to +6V
RE, DE, DI.................................................................-0.3V to +6V
RO1, ST1, ST2...........................................-0.3V to (V_CC1 + 0.3V)
Isolated Side-All Voltages Referenced to GND2.
V_CC2.........................................................................-0.3V to +8V
SLO...........................................................-0.3V to (V_CC2 + 0.3V)
A, B......................................................................................±14V
RO2.....................-0.3V to the lower of (V_CC2 + 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 (T_A = +70°C)
28-Pin Wide SO
(derate 9.5mW/°C above +70°C)..................................750mW
Operating Temperature Range
MXL1535ECWI, MAX3535ECWI............................0°C to +70°C
MXL1535EEWI, MAX3535EEWI..........................-40°C to +85°C
Junction Temperature....................................................+150°C
Storage Temperature Range...........................-65°C to +150°C
Lead Temperature (soldering, 10s)...............................+300°C

The MAX3535E/MXL1535E isolated RS-485/RS-422 full duplex 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 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 savings. 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 commercial 0°C to +70°C and extended -40°C to +85°C temperature ranges.