Renesas RAA78815xxx

The RAA78815x family of 5V powered RS-485/RS-422 transceivers features the industries best electrical fast transient (EFT) immunity in addition to high ESD protection. The devices are immune to ±5kV IEC61000-4-4 EFT as well as being able to withstand ±16.5kV IEC61000-4- 2 ESD strikes without latch-up.

The large output voltage of 3.1V typical into a 54Ω load provides high noise immunity, and enables the drive of up to 2400m long bus segments, or eight 120Ω terminations in a star topology. These devices possess less than 125μA bus input currents, thus constituting a true 1/8 unit load.

Key features

• Industries highest Electrical Fast Transient Immunity to ±5kV
• High output drive: 3.1V typ into Rd = 54Ω enables bus segments up to 2400 meters in length
• Low current: 125μA is a true 1/8th unit load enabling up to 512 transceivers on a bus
• Current Limit and Thermal Protection prevent damage due to bus connecting and wiring fault

Additional features

• High V_OD: 3.1V (Typ) into R_D = 54Ω
• ±5kV EFT immunity of bus I/O pins
• ±16.5kV ESD protection on bus I/O pins
• Supported data rates: 115kbps, 1Mbps, 20Mbps
• Full fail-safe outputs for open or shorted inputs
• Hot plug capability
• 125μA constitutes a true 1/8th unit load
• Allows for up to 512 transceivers on the bus
• Low supply current (driver disabled): 550µA
• Ultra-low shutdown current: 70nA
• Data rates of 115kbps, 1Mbps, and 20Mbps
• The RAA78815x family includes half and full-duplex transceivers with active-high driver-enable pins and active-low receiver enable pins.
• Full fail-safe design that turns the receiver outputs high when the bus inputs are open or shorted.
• MSOP and SOIC packages

Applications

• Programmable Logic Controller (PLC) networks
• AC drive/GP inverter
• Industrial robots