MAX14781E_14 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – Half-Duplex RS-485 Transceiver with Polarity Correction

MAX14781E
Half-Duplex RS-485 Transceiver
with Polarity Correction
General Description
The MAX14781E +5V, half-duplex ±25kV ESD-protected
RS-485 transceiver features integrated automatic polar-
ity correction to ensure that miswired A and B lines are
autonomously corrected, simplifying equipment and net-
work installation.
The MAX14781E includes slew-rate limited drivers that
minimize EMI, allowing for error-free data transmission
up to 370kbps.
This device includes fail-safe circuitry, guaranteeing a
logic-high receiver output when the receiver inputs are
shorted or open. Hot-swap functionality on the receiver
and driver enable inputs also eliminates false transitions
on the bus during power-up or live insertion.
The MAX14781E features a 1/8-unit load receiver input
impedance, allowing up to 256 transceivers on the bus. All
driver outputs are protected up to ±25kV ESD using the
Human Body Model. The MAX14781E is available in an
8-pin SO package and operates over the extended -40°C
to +85°C temperature range.
Applications
●● Power Meter Networks
●● HVAC Networks
●● Control Systems
Benefits and Features
●● Automatic Polarity Correction
●● Integrated Protection Increases Robustness
• High ESD Protection
±25kV HBM ESD
±15kV IEC 61000-4-2 Air Gap Discharge ESD
±9kV IEC 61000-4-2 Contact Discharge ESD
• True Fail-Safe Receiver
• Hot-Swap Functionality
●● +5V Operation
●● Low 10µA (max) Shutdown Current
●● Extended -40°C to +85°C Operating Temperature
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX14781E.related.
Functional Diagram
RO
R
MAX14781E
A
RE
POLARITY
CORRECT
DE
DI
D
B
19-6859; Rev 0; 12/13