ISL3156E

Description

The ISL315XE ISL3156E are BiCMOS, IEC61000 ESD protected, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each driver output and receiver input is protected against 16.5kV ESD strikes without latch-up. The ISL315XE ISL3156E transmitters all deliver exceptional differential output voltages (2.4V min), into the RS-485 required 54 load, for better noise immunity or to allow up to eight 120 terminations in star or other non-standard bus topologies. These devices have very low bus currents (+125A/-75A), so they present a true 1/8 unit load to the RS-485 bus. This ISL3156E allows up to 256 transceivers on the network without violating the RS-485 specifications 32 unit load maximum, and 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 28mA @ VOL = 1V (to ease the design of optocoupled isolated interfaces). The ISL3150E, ISL3152E, ISL3153E, ISL3155E ISL3156E utilize slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state until the power supply has stabilized, and the Tx outputs are fully short circuit protected. The ISL3150E, ISL3153E, ISL3156E are configured for full duplex applications. The half duplex versions multiplex the Rx inputs and Tx outputs to allow transceivers with output disable functions in 8 Ld packages.