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
The TP8485E is available in an SOIC-8 and MSOP-8
package, and is characterized from –40°C to 125°C.
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)