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SP1481E Datasheet(PDF) 6 Page - Sipex Corporation |
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SP1481E Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 11 page Rev:B Date: 02/26/04 SP1481E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation 6 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 SP1481E is equipped with a Shutdown mode. To enter the Shutdown state, both the driver and receiver must be disabled simulta- neously. A logic LOW on DE (pin 3) and a logic HIGH on RE (pin 2) will put the SP1481E into Shutdown mode. In Shutdown, supply current will drop to typically 1 µA. ESD TOLERANCE The SP1481E incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previ- ous family for more rugged applications and environments sensitive to electro-static dis- charges and associated transients. The improved ESD tolerance is at least ±15kV without damage or 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 The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body’s potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 7. This method will test the IC’s capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC1000-4-2 is that the system is required DESCRIPTION The SP1481E is half-duplex differential trans- ceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, this product requires a frac- tion 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 SP1481E are differen- tial outputs meeting the RS-485 and RS-422 standards. 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 out- puts, the drivers can maintain greater than 1.5V voltage levels. The drivers of the SP1481E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differ- ential driver outputs. A logic LOW on DE (pin 3) will tri-state the driver outputs. The transmitters of the SP1481E will operate up to at least 20Mbps. Receivers The SP1481E 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 re- ceivers of the SP1485E 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 receiver for the SP1481E will operate up to at least 20Mbps. The receiver for each of the two devices is equipped with the |
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