SP481E / SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers +5V Only Low Power BiCMOS Driver / Receiver Enable for Multi-Drop configurations Low Power Shutdown mode (SP481E) Enhanced ESD Specifications: +/- 5kV Human Body Model +/-15kV IEC61000-4-2 Air Discharge Available in RoHS Compliant, Lead Free Packaging. DESCRIPTION The SP481E and SP485E are a family of half-duplex transceivers that meet the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD toler- ance has been improved on these devices to over + 5kV 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 ver- sions, the SP481E and SP485E feature Exar s BiCMOS design allowing low power opera- tion without sacrificing performance. The SP481E and SP485E meet the requirements of the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with a low power shutdown mode. Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP48E,485E 04 0524 3 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those Output Voltages indicated in the operation sections of the specifications Logic.........................-0.3V to (Vcc + 0.5V) below is not implied. Exposure to absolute maximum Drivers.............................................+/-15V rating conditions for extended periods of time may Receivers..................-0.3V to (Vcc + 0.5V) affect reliability. Storage Temperature.......................-65C to +150C Power Dissipation V .......................................................................+7V CC 8-pin NSOIC...................................................550mW Input Voltages (derate 6.60mW/C above +70C) Logic.........................-0.3V to (Vcc + 0.5V) 8-pin PDIP.................................................... 000mW Drivers......................-0.3V to (Vcc + 0.5V) (derate .8mW/C above +70C) Receivers.........................................+/-15V ELECTRICAL CHARACTERISTICS T to T and V = +5.0V +/-5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E/SP485E DRIVER DC Characteristics Differential Output Voltage GND Vcc Volts Unloaded R = see Figure 1 Differential Output Voltage 2 Vcc Volts With Load R = 50 (RS-422) see Figure 1 Differential Output Voltage .5 Vcc Volts With Load R = 27 (RS-485) see Figure 1 Change in Magnitude of Driver 0.2 Volts R = 27 or R = 50 see Figure 1 Differential Output Voltage for Complimentary states Driver Common Mode Output 3 Volts R = 27 or R = 50 see Figure 1 Voltage Input High Voltage 2.0 Volts Applies to DE, DI, RE Input Low Voltage 0.8 Volts Applies to DE, DI, RE Input Current +/-0 A Applies to DE, DI, RE Driver Short Circuit Current V = HIGH +/-250 mA -7V V +12V OUT O V = LOW +/-250 mA -7V V +12V OUT O SP481E/SP485E DRIVER AC Characteristics Max. Transmission Rate 0 Mbps RE = 5V, DE = 5V R = 54, DIFF C = C = 00pF L L2 Driver Input to Output, t 30 60 ns See Figures 3 & 5, R = 54, PLH DIFF C = C = 00pF L L2 Driver Input to Output, t 30 80 ns PLH (SP485EMN ONLY) Driver Input to Output, t 30 60 ns See Figures 3 & 5, R = 54, PHL DIFF C = C = 00pF L L2 Driver Input to Output, t 30 80 ns PHL (SP485EMN ONLY) Driver Skew 5 0 ns see Figures 3 and 5, t = t - t SKEW DPHL DPLH Driver Rise or Fall Time 5 40 ns From 0%-90% R = 54 DIFF C = C = 100pF see Figures 3 L L2 and 6 Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www.exar.com SP48E,485E 04 05243 2