Renesas Electronics America Inc. ISL4485E series Drivers Interface ICs

The ISL4485E is a high-speed, BiCMOS 5V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. It is a 5V, Half Duplex, 20Mbps, ±15kV ESD Protected, RS-485/RS-422 Transceiver . Each driver output/receiver input is protected against ±15kV ESD strikes without latch-up. The excellent differential output voltage coupled with high drive-current output stages allows 20Mbps operation over twisted pair networks up to 450 feet in length. The 25kΩ receiver input resistance presents a single unit load to the RS-485 bus, allowing up to 32 transceivers on the network. Receiver (Rx) inputs feature a fail-safe if open design, which ensures a logic high Rx output if Rx inputs are floating. Driver (Tx) outputs are short circuit protected even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive