The devices have a 12 kΩ receiver input impedance, which allows up to 32 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 driver outputs of the ADM3483E/ADM3486E/ADM3488EARZ-REEL7 are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a fail-safe feature thatensures a logic high output when the inputs are floating.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 range and are available in 8-lead and 14-lead narrow SOIC packages.
Feature
- TIA/EIA RS-485/RS-422 compliant
- ±15 kV ESD protection on RS-485 input/output pins
- Data rates: ADM3483E/ADM3488E: 250 kbps
- Half duplex
- Up to 32 nodes on the bus
- Receiver open-circuit, fail-safe design
- Outputs high-Z when disabled or powered off
- Common-mode input range: −7 V to +12 V
- Thermal shutdown and short-circuit protection
- Industry-standard 75176 pinout
- 8-lead SOIC package
Applications
- Power/energy metering
- Telecommunications
- EMI-sensitive systems
- Industrial control
- Local area networks
(Picture: Pinout)
