ADM4857ARZ Datasheet PDF - ADI

●The ADM4857ARZ is a RS-485/RS-422 Differential Line Transceiver suitable for high speed full-duplex data communication on multipoint bus transmission lines. The ADM4857 has dedicated differential line driver outputs and receiver inputs. The parts have 1/8-unit-load receiver input impedance, which allows up to 256 transceivers on one bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is three-stated to avoid overloading the bus. The receiver inputs have a true fail-safe feature, which 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 ends. The driver outputs are slew-rate limited to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit.

● EIA RS-485-/RS-422-compliant

● 10Mbps Data rate

● Reduced slew rates for low EMI

● True fail-safe receiver inputs

● 5µA Maximum supply current in shutdown mode

● Up to 256 transceivers on one bus

● Outputs high-Z when disabled or powered off

● -7 to +12V Bus common-mode range

● Thermal shutdown and short-circuit protection

● Pin-compatible with the MAX308x

●ESD sensitive device, take proper precaution while handling the device.