ISL3178EIUZ-T

ISL3178EIUZ-T is an ESD-protected, 3.3V, full fail-safe, low power, high speed or slew rate limited, RS-485/RS-422 transceiver that meets both the RS-485 and RS-422 standards for balanced communication. It has very low bus currents (+125µA/-100µA), so it presents a true “1/8 unit load” to the RS-485 bus. It allows up to 256 transceivers on the network without violating the RS-485 specification’s 32 unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator using an RS-485 network, so the high allowed node count minimizes the number of repeaters required. The application includes automated utility meter reading systems, high node count systems, field bus networks, security camera networks, building environmental control/lighting systems, and industrial/process control networks.

• Half duplex, 20Mbps data rate, hot plug, 256 number devices on bus
• RT/TX enable, 510µA quiescent ICC, low power shutdown
• IEC61000-4-2 ESD protection on RS-485 I/O pins ±15kV
• HBM Class 3 ESD level on all other pins 7kV
• Full fail-safe (open, short, terminated/floating) receivers
• Hot plug - Tx and Rx outputs remain three-state during power-up
• True 1/8 unit load allows up to 256 devices on the bus, single 3.3V supply
• Current limiting and thermal shutdown for driver overload protection
• Common-mode input/output voltage range from -7V to +12V
• 8 Ld MSOP package, temperature range from -40 to +85°C