MAX14948 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – 5kVRMS Isolated 500kbps Half-Duplex RS-485

MAX14948
EVALUATION KIT AVAILABLE
5kV_RMS Isolated 500kbps Half-Duplex RS-485/
RS-422 Transceiver with ±30kV ESD Protection
General Description
The MAX14948 isolated RS-485/RS-422 transceiver pro-
vides 5000VRMS (60s) of galvanic isolation between the
cable-side (RS-485/RS-422 driver/receiver side) and the
UART-side of the device. Isolation improves communica-
tion by breaking ground loops and reduces noise when
there are large differences in ground potential between
ports. This device allows for robust communication up to
500kbps.
The MAX14948 includes one half-duplex drive/receive
channel. The receiver is 1/8-unit load, allowing up to 256
transceivers on a common bus.
Integrated true fail-safe circuitry ensures a logic-high on
the receiver output when inputs are shorted or open.
Undervoltage lockout disables the driver when cable-side
or UART-side power supplies are below functional levels.
The driver outputs/receiver inputs are protected from
±30kV electrostatic discharge (ESD) to GNDB on the
cable side, as specified by the Human Body Model (HBM).
The MAX14948 is available in a wide body 16-pin SO
package and operates over the -40°C to +85°C tempera-
ture range.
Benefits and Features
●● High-Performance Transceiver Enables Flexible Designs
• Integrated LDO for Cable-Side Power
• Compliant with RS-485/EIA-485 Standard
• 500kbps Maximum Data Rate
• Allows Up to 256 Devices on the Bus
●● Integrated Protection Ensure Robust Communication
• ±30kV ESD (HBM) on Driver Outputs/Receiver Inputs
• 5kVRMS Withstand Isolation Voltage for 60s (VISO)
• 1200VPEAK Maximum Repetitive Peak-Isolation
Voltage (VIORM)
• 848VRMS Maximum Working-Isolation Voltage (VIOWM)
• > 30 Years Lifetime at Rated Working Voltage
• Withstands ±10kV Surge per IEC 61000-4-5
• Thermal Shutdown
Safety Regulatory Approvals Pending
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
●● VDE 0884-10
Applications
●● Industrial Automation Equipment
●● Programmable Logic Controllers
●● HVAC
●● Power Meters
Functional Diagram
VDDA
VLDO
MAX14948
LDO
SBA
VDDB
RE
RXD
A
TXD
B
DE
Ordering Information/Selector Guide appears at end of data
sheet.
GNDA
GNDB
19-7968; Rev 0; 11/15