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SP483ECN Datasheet(PDF) 6 Page - Sipex Corporation |
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SP483ECN Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 11 page SP483EDS/05 SP483E Low EMI Half-Duplex RS485 Transceiver © Copyright 2000 Sipex Corporation 6 Receivers... The SP483E receivers have differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15k Ω (12kΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers have a tri-state enable control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver. The SP483E receiver is rated for data rates up to 250 Kbps. The receivers are equipped with the fail-safe feature. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode... The SP483E is equipped with a Shutdown mode. To enable the Shutdown state, both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a logic HIGH on RE (pin 2) will put the SP483E into Shutdown mode. In Shutdown, supply current will drop to typically 1 µA. ESD TOLERANCE... The SP483E device incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least ±15kV without damage nor latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact DESCRIPTION... The SP483E is a half-duplex differential transceiver that meets the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, the SP483E requires a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Drivers... The driver outputs of the SP483E are differential outputs meeting the RS-485 and RS-422 stan- dards. The typical voltage output swing with no load will be 0 Volts to +5 Volts. With worst case loading of 54 Ω across the differential outputs, the drivers can maintain greater than 1.5V volt- age levels. The drivers have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on DE (pin 3) will tri-state the driver outputs. The SP483E has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483E drivers is 250 Kbps under load. |
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