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SP489ACT Datasheet(PDF) 6 Page - Sipex Corporation |
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SP489ACT Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 7 page SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers © Copyright 2000 Sipex Corporation 6 Table 2. SP489A Truth Table DIFFERENTIAL ENABLES OUTPUT A – B EN1/EN2 or EN3/EN4 RO VID ≥ 0.2V H H –0.2V < VID < +0.2V H X VID ≤ 0.2V H L X L Hi–Z FEATURES… The SP488A and SP489A are low–power quad differential line receivers meeting RS-485 and RS-422 serial protocol. The SP488A and SP489A feature Sipex's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-485 and RS-422 serial protocols over 10Mbps under load in harsh environments. In fact, the SP488A and SP489A can transmit signals up to 30Mbps. The RS-485 standard is ideal for multi-drop applications and for long-distance communica- tion. 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. DIFFERENTIAL ENABLES OUTPUT A – B EN EN RO V ID ≥ 0.2V H X H XL H –0.2V < V ID < +0.2V H X X XL X V ID ≤ 0.2V H X L XL L X L H Hi–Z Table 1. SP488A Truth Table Normally an RS-485 driver will produce no less than 1.5V before cable attenuation. After cable loss, the signal may degrade and have an amplitude of less than 1.0V. The receiver input sensitivity of the SP488A and SP489A allows the devices to receive signals as low as 200mV. The SP488A features active high and active low common receiver enable controls; the SP489A provides independent, active high receiver enable controls for each pair of receivers. Both feature tri–state outputs and a -7V to +12V common–mode input range permitting a ±7V ground difference between devices on the communications bus. The SP488A/489A are equipped with a fail–safe feature which forces a logic high at the receiver output when the input is left floating. Both are available in 16-pin plastic DIP and SOIC packages. |
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