MAX13410E_09 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control

19-1058; Rev 1; 8/09
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
General Description
The MAX13410E–MAX13415E are half-duplex RS-485-/RS-
422-compatible transceivers optimized for isolated appli-
cations. These devices feature an internal low-dropout
regulator (LDO), one driver, and one receiver. The inter-
nal LDO allows the part to operate from an unregulated
power supply of up to 28V. The AutoDirection feature
reduces the number of optical isolators needed in isolat-
ed applications. Other features include enhanced ESD
protection, fail-safe circuitry, slew-rate limiting, and full-
speed operation.
The MAX13410E–MAX13415E internal LDO generates a
5V ±10% power supply that is used to power its internal
circuitry. The MAX13412E–MAX13415E bring the 5V to an
output V_REG that allows the user to power additional
external circuitry with up to 20mA to further reduce exter-
nal components. The MAX13410E/MAX13411E do not
have a 5V output and come in industry-compatible
pinouts. This allows easy replacement in existing designs.
The MAX13410E–MAX13415E feature a 1/8-unit load
receiver input impedance, allowing up to 256 trans-
ceivers on the bus. All driver outputs are ESD protected
using the Human Body Model. These devices also
include fail-safe circuitry (MAX13410E/MAX13411E/
MAX13414E/MAX13415E only), guaranteeing a logic-
high receiver output when the receiver inputs are open
or shorted. The receiver outputs a logic-high when the
transmitter on the terminated bus is disabled (high
impedance).
The MAX13412E/MAX13413E feature Maxim’s propri-
etary AutoDirection control. This architecture eliminates
the need for the DE and RE control signals. In isolated
applications, this reduces the cost and size of the sys-
tem by reducing the number of optical isolators required.
The MAX13410E/MAX13412E/MAX13414E feature
reduced slew-rate drivers that minimize EMI and reduce
reflections caused by improperly terminated cables,
allowing error-free transmission up to 500kbps. The
MAX13411E/MAX13413E/MAX13415E are not slew-rate
limited, allowing transmit speeds up to 16Mbps.
The MAX13410E–MAX13415E are available in an 8-pin
SO package with an exposed paddle to improve power
dissipation, and operate over the extended -40°C to
+85°C temperature range.
Features
♦ Wide +6V to +28V Input Supply Range
♦ +5V Output Supplies Up to 20mA to External
Circuitry
♦ Internal LDO
♦ Low 65µA (typ) Shutdown Supply Current
♦ Extended ESD Protection
±15kV Human Body Model (MAX13412E/
MAX13413E)
±14kV Human Body Model (MAX13410E/
MAX13411E)
♦ 1/8-Unit Load, Allowing Up to 256 Transceivers on
the Bus
♦ -40°C to +85°C Operating Temperature Range
♦ Fail-Safe
♦ Slew-Rate Limited and Full-Speed Versions
♦ Up to 16Mbps Data Rate on Full-Speed Versions
Isolate-d RS-485 Interfaces
Utility Meters
Applications
Industrial Equipment
Telecomm Equipment
Pin Configurations
TOP VIEW
RO 1 ⁺
RE 2
DE 3
MAX13410E
MAX13411E
8 V_CC
7B
6A
DI 4
*EP 5 GND
SO
*EXPOSED PAD CONNECTED TO GROUND
Pin Configurations continued at end of data sheet.
Ordering Information/Selector Guide
PART
PIN-PACKAGE
AutoDirection
DATA RATE (max)
5V LDO OUTPUT
MAX13410EESA+
8 SO-EP*
No
500kbps
No
MAX13411EESA+
8 SO-EP*
No
16Mbps
No
Note: All devices operate over the -40°C to +85°C operating
temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information/Selector Guide continued at end of data
sheet.
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