ADI ADM3074EARZ

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 % 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 powereddown 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. The driver outputs of the 250 kbps and 500 kbps devices 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. The parts are fully specified over the industrial temperature ranges and are available in 8-lead and 14-lead narrow SOIC packages.

• 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
• -40°C to +125°C temperature option
• Hot-swap input structure on DE and RE pins
• Reduced slew rates for low EMI
• Low power shutdown current (all except ADM3071E/ ADM3074E/ADM3077E)
• Outputs high-Z when disabled or powered off
• Common-mode input range: −7 V to +12 V
• Thermal shutdown and short-circuit protection
• 8-lead and 14-lead narrow SOIC packages

• Power/energy metering
• Industrial control
• Lighting systems
• Telecommunications
• Security systems
• Instrumentation