ADI ADM1486ARZ-REEL

The ADM1486 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission, complies with EIA Standards RS - 485 and RS - 422, and is recommended for PROFIBUS applications. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled or powered down, the driver outputs are high impedance.

The ADM1486 operates from a single 5V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short - circuit protection and thermal circuitry. Short - circuit protection circuits limit the maximum output current to ±200mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150℃ and forces the driver outputs into a high impedance state under this condition.

Up to 50 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at a time. Therefore, it is important that the remaining disabled drivers do not load the bus.

To ensure this, the ADM1486 driver features high output impedance when disabled and when powered down. This minimizes the loading effect when the transceiver is not being used. The high impedance driver output is maintained over the entire common - mode voltage range from - 7V to +12V

The receiver contains a fail - safe feature that results in a logic high output state if the inputs are unconnected (floating).

The ADM1486 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology. All inputs and outputs contain protection against ESD; all driver outputs feature high source and sink current capability. An epitaxial layer is used to guard against latch - up.

The ADM1486 features extremely fast and closely matched switching, enable, and disable times. Minimal driver propagation delays permit transmission at data rates up to 30 Mbps while low skew minimizes EMI interference.

The part is fully specified over the commercial and industrial temperature range and is available in an 8 - lead SOIC package.

• MEETS and exceeds EIA RS - 485 and EIA RS - 422 standards
• 30 Mbps data rate
• Recommended for PROFIBUS applications
• 2.1 V minimum differential output with 54 Ω termination
• Low power 0.8 mA Icc
• Thermal shutdown and short - circuit protection
• 0.5 ns skew driver and receiver
• Driver propagation delay: 11 ns
• Receiver propagation delay: 12 ns
• High impedance outputs with drivers disabled or power off
• Superior upgrade for SN65ALS1176
• Available in standard 8 - lead SOIC package

• Industrial field equipment