Date: 11/11/2009
New transceivers from Exar for RS-485 and RS-422 communication applications
Exar has launched transceiver family called PROFIBUS with device part numbered as XR5486E, XR5487E, and XR5488E. The transceivers offer 52 Mbps with a high-differential output swing (minimum 2.4V) which makes them ideal for industrial markets including applications such as field bus networks, high-speed motor control, factory automation, building automation, security systems and remote meter reading.
"The XR548xE series is unique in the industry; it supports 52 Mbps and higher driver output swing giving designers maximum design flexibility for PROFIBUS and ultra high-speed RS-485/RS-422 communications applications," said Hensen Wong, technical marketing manager, Interface Product Line. "The series has standard pin out and low power consumption which enable customers to easily migrate to high-speed applications with significantly reduced time-to-market."
The XR548xE series is designed for reliable, bidirectional communication on multipoint bus transmission lines. Each device contains one differential driver and one differential receiver. The XR5488E is a half-duplex device, while the XR5486E and XR5487E are full duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and RoHS compliant packages are available for all models.
All three devices are ruggedized for use in harsh operating conditions over the entire common-mode voltage range from -7 to +12V. The higher differential driver output swing enables more reliable communication over longer cable lengths. Receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe ESD events up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC-61000-4-2). Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for Industrial (-40 to +85șC) operating temperatures. Receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while preserving full signal margin.
All devices operate from a single 5.0V power supply and draw negligible quiescent power. All versions except the XR5487E may independently enable and disable their driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance in shutdown or when powered-off.
Package:
XR5486E: Halogen free 14-pin nSOIC package
XR5487E: Halogen free 8-pin nSOIC package
XR5488E: Halogen free 8-pin nSOIC package
Price:
XR5486E, XR5487E, XR5488E: Starts at $1.30 for 1K pieces
Availability:
XR5486E: Now
XR5487E: Now
XR5488E: Now