MAX3535E_14 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – +3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection

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AVAILABLE
MAX3535E/MXL1535E
+3V to +5V, 2500V_RMS Isolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
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 imp_Fro_uv_ned_cs_te_ic_oo_nnd_aa_lry_Dsu_ip_ap_gly_rr_aan_mge_sof
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
Typical Application Circuit appears at end of data sheet.
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.
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
O_Or_rd_de_er_ri_in_ng_g I_In_nf_fo_or_rm_ma_at_ti_io_on_n
PART
TEMP RANGE
PIN-
PACKAGE
MAX3535ECWI 0°C to +70°C
MAX3535EEWI -40°C to +85°C
MXL1535ECWI 0°C to +70°C
MXL1535EEWI -40°C to +85°C
28 Wide SO
28 Wide SO
28 Wide SO
28 Wide SO
POWER-
SUPPLY
RANGE
(V)
+3.0 to +5.5
+3.0 to +5.5
+4.5 to +5.5
+4.5 to +5.5
TOP VIEW
Pin Configuration
VCC1 1
ST1 2
ST2 3
GND1 4
28 RO1
27 RE
26 DE
25 DI
MAX3535E
MXL1535E
GND2 11
18 SLO
Z 12
17 RO2
Y 13
16 A
VCC2 14
15 B
WIDE SO
PINS 5–10 and 19–24 ARE REMOVED FROM THE PACKAGE
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-3270; Rev 0; 4/04