SP481/SP483/SP485 Low Power Half-Duplex RS-485 Transceivers FEATURES +5V Only RO 1 8 V R CC Low Power BiCMOS Driver/Receiver Enable RE 2 7 B Slew Rate Limited Driver for Low EMI (SP483) DE 3 6 A Low Power Shutdown Mode (SP481 D and SP483) DI 4 5 GND SP485 RS-485 and RS-422 Drivers/Receivers Top View SP481, SP483, SP485 Pinout (Top View) DESCRIPTION The SP481, SP483, and the SP485 are a family of half-duplex transceivers that meet the requirements of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacrificing performance. The SP481 and SP485 meet the requirements of RS-485 and RS-422 up to 5Mbps. Additionally, the SP481 is equipped with a low power Shutdown mode. The SP483 is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. The SP483 is also equipped with a low power Shutdown mode. RO 1 R 8 Vcc RE 2 RE 7 B DE 3 6 A DI 4 5 GND D SP481, SP483, and SP485 Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers Copyright 2002 Sipex Corporation 1ABSOLUTE 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 ........................................................................................................12V CC Input Voltages Logic........................................................-0.3V to (V +0.5V) CC Drivers..................................................-0.3V to (V +0.5V) CC Receivers................................................................. 15V Output Voltages Logic........................................................-0.3V to (V +0.5V) CC Drivers...................................................................... 15V Receivers............................................-0.3V to (V +0.5V) CC Storage Temperature.......................................................-65C to +150C Power Dissipation...........................................................................500mW ELECTRICAL CHARACTERISTICS T to T and V = 5V 5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481/SP483/SP485 DRIVER DC Characteristics Differential Output Voltage GND 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 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 35 250 mA -7V V +12V OUT O V = LOW 35 250 mA -7V V +12V OUT O SP481/SP485 DRIVER AC Characteristics 5 Maximum Data Rate Mbps RE = 5V, DE = 5V Driver Input to Output 30 60 ns t R = 54, C = C = 100pF PLH DIFF L1 L2 see figures 3 and 6 Driver Input to Output 30 60 ns t R = 54, C = C = 100pF PHL DIFF L1 L2 see figures 3 and 6 Driver Skew 5 10 ns see figures 3 and 6, t = t - t SKEW DPLH DPHL Driver Rise or Fall Time 15 40 ns From 10% to 90% R = 54 , DIFF C = C = 100pF see figures 3 and 6 L1 L2 Driver Enable to Output High 40 70 ns C = 100pF see figures 4 & 7 S closed L 2 Driver Enable to Output Low 40 70 ns C = 100pF see figures 4 & 7 S closed L 1 Driver Disable Time from Low 40 70 ns C = 15pF see figures 2 & 9 S closed L 1 Driver Disable Time from High 40 70 ns C = 15pF see figures 2 & 9 S closed L 2 SP481/SP483/SP485 RECEIVER DC Characteristics Differential Input Threshold +0.2 Volts -7V V +12V CM Input Hysteresis 10 mV V = 0V CM 5 Output Voltage High 2.4 Volts I = -4mA,V = +200mV O ID Output Voltage Low 0.4 Volts I = +4mA,V = -200mV 0.0 O ID Three-State (High Impedance) Output Current 1 A 0.4V V 2.4V RE = 5V O Input Resistance 15 k -7V V +12V CM Input Current (A, B) V = 12V +1.0 mA DE = 0V, V = 0V or 5.25V, V = 12V IN CC IN Input Current (A, B) V = -7V -0.8 mA DE = 0V, V = 0V or 5.25V, V = -7V IN CC IN Short-Circuit Current 95 mA 0V V V CM CC Rev. 07/28/04 SP481/483/485 Low Power Half-Duplex RS485 Transceivers Copyright 2002 Sipex Corporation 2