TP8485E-SR

The TP8485E are IEC61000 ESD protected, 3V~5.5V powered transceivers that meet the RS-485 and RS-422 standards for balanced communication. Driver outputs and receiver inputs are protected against ±18KV ESD strikes without latch-up. Transmitters in this family deliver exceptional differential output voltages (2.5V min/5Vcc), into the RS-485 required 54Ω load, for better noise immunity, or to allow up to eight 120Ω terminations in “star” topologies. These devices have very low bus currents so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without using repeaters. Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven bus. Rx outputs feature high drive levels - typically 25mA @ VOL = 1V (to ease the design of optocoupled isolated interfaces). The TP8485E is available in an SOIC-8 and MSOP-8 package, and is characterized from -40°C to 125°C.

Applications

• E-Metering Networks
• Industrial Automation
• HVAC Systems
• Process Control
• DMX512-Networks
• Battery-Powered Applications

Key features

• Exceeds Requirements of EIA-485 Standard
• Hot Plug Circuitry - Tx and Rx Outputs Remain Three-State During Power-up/Power-down
• Data Rate: 300 bps to 250 kbps
• Full Fail-safe (Open, Short, Terminated) Receivers
• Up to 256 Nodes on a Bus (1/8 unit load)
• Wide Supply Voltage 3V to 5.5V
• SOIC-8 Package for Backward Compatibility
• Bus-Pin Protection:
• ±18 kV HBM protection
• ±13 kV IEC61000-4-2 Contact Discharge
• +4 kV IEC61000-4-4 Fast Transient Burst