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SP3491EP Datasheet(PDF) 8 Page - Sipex Corporation |
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SP3491EP Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 11 page Rev. 10/11/02 SP3490/3491 Low Power Full-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation 8 DESCRIPTION The SP3490 and the SP3491 are two members in the family of +3.3V low power full duplex transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with the Sipex SP490 and the SP491 devices as well as popular industry standards. The SP3490 and the SP3491 feature Sipex's BiCMOS process allowing low power operation without sacrificing performance. Driver The drivers for both the SP3490 and SP3491 have differential outputs. The typical voltage output swing with no load will be 0 volts to V CC. With a load of 54 Ω across the differential outputs, the driver maintains greater than 1.5V voltage levels. The driver of the SP3491 has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP3491 will enable the differ- ential driver outputs. A logic low on DE (pin 4) of the SP3491 will tri-state the driver outputs. The SP3490 does not have a driver enable. Receiver The receivers for the SP3490 and SP3491 have differential inputs with an input sensitivity as low as ±100mV. 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 for both the SP3490 and SP3491 are equipped with a fail-safe feature that guarantees the receiver output will be in a high state when the input is left unconnected. The receiver of the SP3491 has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP3491 will enable the differential receiver. A logic high on REB (pin 3) of the SP3491 will tri-state the receiver. |
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