The input impedance is 12 kΩ, allowing 32 transceivers to be connected on the bus. The ADM488A/ADM489A operate from a single 5 V ± 10% power supply.
Excessive power dissipation that is caused by bus contention or output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if, during fault conditions, a significant temperature increase is detected in the internal driver circuitry.The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
The ADM488A/ADM489A are fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology.
The ADM488A/ADM489A are fully specified over the industrial temperature range and are available in SOIC and MSOP packages.
ApplicationsFeature
- Complies with ANSI TIA/EIA-485-A-1998 and ISO 8482: 1987(E)
- 250 kbps data rate
- Single 5 V ± 10% supply
- −7 V to +12 V bus common-mode range
- Connect up to 32 nodes on the bus
- Reduced slew rate for low EM interference
- Short-circuit protection
- 30 μA supply current
Applications
- Low power RS-485 and RS-422 systems
- DTE-DCE interface
- Packet switching
- Local area networks
- Data concentration
- Data multiplexers
- Integrated services digital network (ISDN)
(Picture: Pinout)
