RAA788178 Datasheet | Renesas

feature high output drive and high EFT and ESD protection. The devices are immune to ±3k V IEC61000-4-4 EFT transients and withstand ±15k V IEC61000-4-2 ESD strikes without latch-up. These devices have low bus currents (+125µA/-100µA), so they present a true 1/8 unit load to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification 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. Receiver (Rx) inputs feature a Full Fail-Safe design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven. Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes. The RAA788170 through RAA788175 use slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Slew rate limited versions also include receiver input filtering to enhance noise immunity in the presence of slow input signals. The RAA788170, RAA788173, and RAA788176 are configured for full duplex (separate Rx input and Tx output pins) applications. The half duplex versions multiplex the Rx inputs and Tx outputs to allow transceivers with output disable functions in 8 Ld packages. Features - IEC61000 ESD protection on RS-485 I/O pins: ±15k V - Class 3 ESD level on all other pins: >7k V HBM - ±3k V EFT immunity of bus I/O pins - 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 - High data rates: up to 20Mbps - Low quiescent supply current: 800µA (Max) - Ultra low shutdown supply current: 10n A -...