TPT7481/TPT7482 Isolated Full- and Half-Duplex RS485 Transceiver

　　The TPT7481 is a ±15 kV IEC61000 ESD protected, 3.0 V ~ 5.5 V isolated RS485 transceivers that meet the RS-485 and RS-422 standards for Half Duplex communication. The TPT7482 is isolated Full Duplex RS485. The TPT748x features a fail-safe receiver, which support the output of the receiver to be logic high when the differential input (bus pin A/B) of the receiver is open, short or idle. Transmitters in this family deliver exceptional differential output voltages into the RS-485 required 54 Ω load. The 20 Mbps device has 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. The TPT748x is available in WSOP-16 package and is characterized from −40°C to +125°C.

　　Features

　　Ÿ Exceeds Requirements of EIA-485 Standard

　　Ÿ Hot Plug Circuitry - Tx and Rx Outputs Remain

　　Three-State During Power-up/Power-down

　　Ÿ Supply voltage: 3.0 V ~ 5.5 V

　　Ÿ Data Rate: 20 Mbps isolated RS485

　　Ÿ Full Fail-safe Receiver (Open, Short, Terminated)

　　Ÿ 5 kVRMS Isolation Rating

　　Ÿ ±200 kV/μs typ static CMTI, ±150 kV/μs typ

　　dynamic CMTI

　　Ÿ Latch-Up performance exceeds 600 mA

　　Ÿ Bus-Pin Protection (Between Bus pins and

　　GNDB)

　　− ±15 kV IEC 61000-4-2 Contact Discharge

　　− ±18 kV IEC 61000-4-2 Air Discharge

　　Ÿ Safety-Related Certifications:

　　− VDE Certification according to DIN VDE V

　　0884-17(IEC60747-17)

　　− 5000VRMS (WSOP16, WSOP8), 3750VRMS

　　(SOP8) Isolation Rating per UL 1577

　　− CQC Certification per GB 4943.1

　　− CAS, TUV and CB certifications

　　Applications

　　Ÿ Home Appliance

　　Ÿ Motor Drives

　　Ÿ Industrial Control

　　Ÿ Communication Infrastructure