SP1490E/SP1491E full duplex rS-485 t ransceivers fEaturES +5V Only A 1 8 V Low Power BiCMOS CC SP1490E Driver/Receiver Enable (SP1491E) RO 2 7 B RS-485 and RS-422 Drivers/Receivers 8 Pin nSOIC DI 3 6 Z 8 Pin - nSOIC Pin Compatible with SN75179 (SP1490E) 4 5 Y GND Pin Compatible with SN75180 (SP1491E) Improved ESD Specifications 15kV Human Body Model aPPLicationS 15kV IEC61000-4-2 Air Discharge Industial Networks Telecom Motor Control HVAC/ Building Control ESd criPtion The SP1490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 20Mbps. The SP1491E is identical to the SP1490E with the addition of driver and receiver tri- state enable lines. Both products feature 200mV receiver input sensitivity, over wide common mode range. The SP1490E is available in an 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP1491E is available in a 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLocK diaGraM 14 Vcc NC 1 13 NC Vcc 1 8 A 12 A RO 2 RO 2 R R 7 B 11 B REB 3 6 Z DE 4 DI 3 D 10 Z 5 Y GND 4 DI 5 D 9 Y GND 6 GND 7 8 NC SP1490E SP1491E Exar Corporation 48720 Kato Road, Fremont CA, 94538 5 0-668-70 7 www.exar.com SP490 SP 49 E 0 0524 3 aBSoLutE MaXiMuM ratinGS 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 ...................................................................................................+7V 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 +150 Power Dissipation.....................................................................1000mW ELECTRICAL CHARACTERISTICS T to T and V = 5V 5% unless otherwise noted. MIN MAX CC ParaMEtErS Min. tYP. MaX. unitS conditionS SP1490E/1491E 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 (RS422) CC see figure 1 Differential Output Voltage 1.5 V Volts With Load R = 27 (RS485) see CC figure 1 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 D Input Low Voltage 0.8 Volts Applies to D Input Current 10 A Applies to D Driver Short-Circuit Current V = HIGH 250 mA -7V V +12V OUT O V = LOW 250 mA -7V V +12V OUT O SP1490E/1491E drivEr ac characteristics Maximum Data Rate 20 Mbps Driver Input to Output 30 40 ns t R = 54, C = C = 100pF R/F DIFF L1 L2 see figures 3 and 6 Driver Input to Output 30 40 ns t R = 54, C = C = 100pF R/F DIFF L1 L2 see figures 3 and 6 Driver Skew 5 ns see figures 3 and 6, t = t - t R/F PLH PHL Driver Rise or Fall Time 8 20 ns From 10% to 90% R = 54, DIFF SP1491Eonly C = C = 100pF see figures 3 and 6 L1 L2 t R/F Driver Enable to Output High 20 70 ns C = C = 100pF see figures L1 L2 4 and 7 S closed 2 Driver Enable to Output Low 40 70 ns C = C = 100pF see figures L1 L2 4 and 7 S closed Driver Disable Time from Low 40 70 ns C = C = 100pF see figures L1 L2 4 and 7 S closed Driver Disable Time from High 40 70 ns C = C = 100pF see figures L1 L2 4 and 7 S closed 2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 5 0-668-70 7 www.exar.com SP 490 SP49 E 0 05243 2