SN65HVD888 Datasheet, PDF (1/21 Pages) Texas Instruments – Bus-Polarity Correcting RS-485 Transceiver With IEC-ESD Protection

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SN65HVD888
www.ti.com
SLLSEH3 – JULY 2013
Bus-Polarity Correcting RS-485 Transceiver With IEC-ESD Protection
FEATURES
1
• Exceeds Requirements of EIA-485 Standard
• Bus-Polarity Correction within 76 ms (t_FS)
• Data Rate: 300 bps to 250 kbps
• Works with Two Configurations:
– Failsafe Resistors Only
– Failsafe and Differential Termination
Resistors
• Up to 256 Nodes on a Bus (1/8 unit load)
• SOIC-8 Package for Backward Compatibility
• Bus-Pin Protection:
– ±16 kV HBM protection
– ±12 kV IEC61000-4-2 Contact Discharge
– +4 kV IEC61000-4-4 Fast Transient Burst
APPLICATIONS
• E-Metering Networks
• Industrial Automation
• HVAC Systems
• DMX512-Networks
• Process Control
• Battery-Powered Applications
• Motion Control
• Telecom Equipment
DESCRIPTION
The SN65HVD888 is a low-power RS-485 transceiver
with automatic bus-polarity correction and transient
protection. Upon hot plug-in, the device detects and
corrects the bus polarity within the first 76 ms of bus
idling. On-chip transient protection protects the device
against IEC61000 ESD and EFT transients. This
device has robust drivers and receivers for
demanding industrial applications. The bus pins are
robust to electrostatic discharge (ESD) events, with
high levels of protection to Human-Body Model
(HBM), Air-Gap Discharge, and Contact Discharge
specifications.
The device combines a differential driver and a
differential receiver, which operate together from a
single 5-V power supply. The driver differential
outputs and the receiver differential inputs are
connected internally to form a bus port suitable for
half-duplex (two-wire bus) communication. The
device features a wide common-mode voltage range
making the device suitable for multi-point applications
over long cable runs. The SN65HVD888 is available
in an SOIC-8 package, and is characterized from
–40°C to 85°C.
TYPICAL NETWORK APPLICATION WITH POLARITY CORRECTION (POLCOR)
R
R
RE
5V
1k
A
Cross-wire
fault ₀
R
R
A
RE
DE
B
B
DE
D
D
1k
AB
AB
D
D
Master
SN65HVD82
Slave
SN65HVD888
R
D
R
D
POLCOR
POLCOR
R RE DE D
Slave
SN65HVD888
R RE DE D
Slave
SN65HVD888
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated