SP1481E/SP1485E Enhanced Low Power Half-Duplex RS-485 Transceivers +5V Only Low Power BiCMOS Driver/Receiver Enable for Multi-Drop configurations Low Power Shutdown Mode (SP 48E) Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC61000-4-2 Air Discharge Now Available in Lead Free Packaging description The SP1481E and the SP1485E are a family of half-du plex transceivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over +15KV for both Human Body Model and IEC61000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with Exar s SP481 and SP485 devices as well as popular industry standards. As with the original versions, the SP1481E and the SP1485E feature Exar s BiCMOS design allowing low power operation without sacrificing performance. The SP1481E and SP1485E meet the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load. The SP1481E is equipped with a low power Shutdown mode. Exar Corporation 48720 Kato Road, Fremont CA, 94538 5 0-668-70 7 www.exar.com SP 48E- 485E 03 0524 3 Output Voltages ABsoLUte MAXiMUM rA tinGs Logic.............................................-0.3V to (V +0.5V) These are stress ratings only and functional operation of the device at CC Drivers................................................................ 15V these ratings or any other above those indicated in the operation sections Receivers......................................-0.3V to (V +0.5V) of the specifications below is not implied. Exposure to absolute maximum CC Storage Temperature.....................................................-65C to +150C rating conditions for extended periods of time may affect reliability. V ..............................................................................+7V CC Power Dissipation per Package o o 8-pin NSOIC (derate 6.60mW/ C above +70 C).........................550mW Input Voltages Logic...................................................-0.3V to (V +0.5V) CC Drivers................................................-0.3V to (V +0.5V) CC Receivers................................................................. 15V eLectricAL cHArActeristics T to T and V = 5V 5% unless otherwise noted. MIN MAX CC pArAMeters Min. tYp . MAX. Units conditions sp1481e/sp1485e driver dc characteristics Differential Output Voltage 3.5 V Volts Unloaded R = see Figure 1 CC Differential Output Voltage 2 V Volts with load R = 50 (RS-422) CC see Figure 1 Differential Output Voltage 1.5 V Volts with load R = 27 (RS-485) see Figure 1 CC Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 or R = 50 see Figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 or R = 50 see Figure 1 Input High Voltage 2.0 Volts Applies to DE, DI, RE Input Low Voltage 0.8 Volts Applies to DE, DI, RE Input Current 10 A Applies to DE, DI, RE Driver Short-Circuit Current V = HIGH 250 mA -7V V +12V OUT O V = LOW OUT 250 mA -7V V +12V O sp1481e/sp1485e driver Ac characteristics Maximum Data Rate 20 Mbps RE = 5V, DE = 5V R = 54, DIFF C = C = 00pF L1 L2 Driver Input to Output 20 30 ns t R = 54, C = C = 100pF PLH DIFF L1 L2 see Figures 3 and 5 Driver Input to Output 20 40 ns t R = 54, C = C = 100pF PLH DIFF LI L2 (SP1485EMN ONLY) See Figures 3 and 5 Driver Input to Output 20 30 ns t R = 54, C = C = 100pF PHL DIFF L1 L2 see Figures 3 and 5 Driver Input to Output 20 40 ns t R = 54, C = C = 100pF PHL DIFF L1 L2 (SP1485EMN ONLY) see Figures 3 and 5 Driver Skew 3 5 ns see Figures 3 and 5, t = t - t SKEW PLH PHL Driver Rise or Fall Time 8 20 ns From 10% to 90% R = 54, DIFF C = C = 100pF see Figures 3 & 6 L1 L2 Driver Enable to Output High 40 70 ns C = 100pF see Figures 4 & 6 S closed L 2 Driver Enable to Output Low 40 70 ns C = 100pF see Figures 4 & 6 S closed L Driver Disable Time from Low 40 70 ns C = 100pF see Figures 4 & 6 S closed L Driver Disable Time from High 40 70 ns C = 100pF see Figures 4 & 6 S closed L 2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP 48E- 485E 03 0524 3 2