SP490E / SP491E Enhanced Full-Duplex RS-485 Transceivers Description FEATURES The SP490E is a low power differential line driver/receiver meeting 5V only RS-485 and RS-422 standards up to 10Mbps. The SP491E is identical Low power BiCMOS Driver/receiver enable (SP491E) to the SP490E with the addition of driver and receiver tri-state enable RS-485 and RS-422 drivers/receivers lines. Both products feature 200mV receiver input sensitivity, over Pin compatible with LTC490 and SN75179 wide common mode range. The SP490E is available in 8-pin NSOIC (SP490E) packages for operation over the commercial and industrial temperature Pin compatible with LTC491 and SN75180 ranges. The SP491E is available in 14-pin NSOIC packages for (SP491E) operation over the commercial and industrial temperature ranges. Improved ESD specifications: 15kV Human Body Model 15kV IEC61000-4-2 Air Discharge Ordering Information - Back Page Block Diagrams 1 14 1 VCC V CC NC 13 NC 8 12 A A 2 2 R R R R 7 11 B B 3 RE 4 DE 6 10 Z Z 3 5 D D D D 5 9 6 Y Y GND 8 4 7 NC GND GND SP490E SP491E REV 1.0.2 1/13SP490E / SP491E Absolute Maximum Ratings (SP490E) These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V .............................................................................7.0V CC Input Voltages Drivers......................-0.5V to (V + 0.5V) CC Receivers...........................................14V Output Voltages Drivers................................................14V Receivers..................-0.5V to (V + 0.5V) CC Storage Temperature.................................-65C to +150C Power Dissipation..................................................1000mW Electrical Characteristics T = T to T and V = 5V 5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP490E Driver DC Characteristics Differential output voltage V V Unloaded R = Figure 1 CC Differential output voltage 2 V V With load R = 50 (RS-422) Figure 1 CC Differential output voltage 1.5 V V With load R = 27 (RS-485) Figure 1 CC Change in magnitude of driver differential output voltage for 0.2 V R = 27 or R = 50 Figure 1 complimentary states Driver common-mode output voltage 3 V R = 27 or R = 50 Figure 1 Input high voltage 2.0 V Applies to D Input low voltage 0.8 V Applies to D Input current 10 A Applies to D Driver short circuit current 250 mA -7V V 12V O V = HIGH OUT Driver short circuit current 250 mA -7V V 12V O V = LOW OUT SP490E Driver AC Characteristics Maximum data rate 10 Mbps Driver input to output, t 30 60 ns R = 54, C = C = 100pF Figures 3 & 5 PLH DIFF L1 L2 Driver input to output, t 30 60 ns R = 54, C = C = 100pF Figures 3 & 5 PHL DIFF L1 L2 Driver skew 5 ns t = t - t Figures 3 & 5 SKEW DPLH DPHL From 10%-90% R = 54, DIFF Driver rise or fall time 15 40 ns C = C = 100pF Figures 3 & 5 L1 L2 REV 1.0.2 2/13