The ST low-power, high-speed transceivers for RS485 and RS422 communication applications ensure high robustness over medium to long cables. The portfolio offers improved ESD performances at system level IEC61000-4-2, good coupling immunity to fast transients IEC61000-4-4, high signal integrity on the data through reliable hot-plug detection, a failsafe receiver, and good eye diagram performance.
These transceivers support a wide range of power supplies and logic I/O voltages for optimal adaptation to specific applications. A SERCOS interface controller for industrial control systems enables real-time communication via optical fiber rings, RS-485 rings, and RS-485 buses.
The RS485 and RS422 portfolio offers a wide range of interfaces to meet various industrial application requirements in terms of data rates, power supplies, protections, and packages.
Applications:
Product types:
High ESD IEC61000-4-2 contact protection using our new ST4E1216 and ST4E1240. Low power supply STR485 with Vcc=3.3 V and I/O compatible at 1.8 V.
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Benefits:
- Signal integrity on buses
- Improved safety for maintenance equipment
- Suitable for high-speed applications
- Easy implementation and interoperability
Low-power RS-485 transceiver with selectable data rate and compatible with 1.8 V I/Os
A 3.3 V differential line transceiver for RS-485 data transmissions in half-duplex mode, the STR485LV includes an external slew rate select pin able to switch between a fast data rate up to 20 Mbps or a slow data rate up to 250 kbps for longer cables.
Able to interface directly with voltage logic from 1.8 to 3.3 V, this differential driver/receiver is robust over fast transient burst IEC61000-4-4 Class B conditions and the bus pins withstand over ±8kV contact discharge and ±16kV air discharge conditions without latch-up, exceeding IEC 61000-4-2 specifications.
Available in a small (3 x3 mm) DFN10 package with a temperature range from –40 up to +105 °C, the STR485LV is a perfect fit for a wide range of applications including telecom infrastructure, high-speed data links, and low-voltage microcontroller communications.
Low-power differential line transceiver for standard RS485 data transmission in half-duplex mode
The ST4E1240 and ST4E1216 are high-speed RS485 transceivers compatible with either 3.3 V or 5 V rail power supplies.
Thanks to the high speed up to 40 Mbps data rate, they particularly suit multipoint applications over extended cable runs like factory automation and control, robotics, video surveillance, grid infrastructure, and data acquisition.
Packaged in a standard SO-8, the ST4E1216 and ST4E1240 integrates several protections such as a fail-safe receiver for bus open, idle, and shorted conditions, thermal shutdown, hot-swap capability, and bus I/O ESD protection IEC61000-4-2 +/-12kV.
