SP491CN-L/TR

SP490 / SP491 Full-Duplex RS-485 Transceivers Description FEATURES The SP490 is a low power differential line driver/receiver meeting 5V only RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical Low power BiCMOS Driver/receiver enable (SP491) to the SP490 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 SP490 is available in 8-pin NSOIC (SP490) packages for operation over the commercial temperature range. The Pin compatible with LTC491 and SP491 is available in 14-pin NSOIC packages for operation over the SN75180 (SP491) commercial and industrial temperature ranges. Ordering Information - Back Page Block Diagrams 14 1 1 VCC V NC CC 13 NC 8 12 A A 2 2 R R R R 11 7 B B 3 REB 4 DE 10 6 Z Z 3 5 D D D D 9 5 6 Y Y GND 8 7 4 NC GND GND SP490 SP491 REV 1.0.2 1/13SP490 / SP491 Absolute Maximum Ratings (SP490) 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 SP490 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 SP490 Driver AC Characteristics Maximum data rate 5 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% to 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