3.3 V, ⅛ Load, ±15kV ESD Protected, RS-485/RS-422 Transceiver (Full Duplex, 500 kbps)

The ADM307xE are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards: RS-485 and RS-422.

The devices have a ⅛ unit load receiver input impedance, which allows up to 256 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus.

The receiver inputs have a true fail-safe feature, which eliminates the need for external bias resistors and ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and when communication ceases.

Applications

* Power/energy metering

* Industrial control

* Lighting systems

* Telecommunications

* Security systems

* Instrumentation

* TIA/EIA RS-485/RS-422 compliant

* ±15 kV ESD protection on RS-485 input/output pins

* Data rates

* ADM3070E/ADM3071E/ADM3072E: 250 kbps

* ADM3073E/ADM3074E/ADM3075E: 500 kbps

* ADM3076E/ADM3077E/ADM3078E: 16 Mbps

* Half- and full-duplex options

* True fail-safe receiver inputs

* Up to 256 nodes on the bus