SP3485 3.3V Low Power Half-Duplex RS-485 Transceiver with 10Mbps Data Rate August 5, 2021 Description FEATURES The SP3485 device is a 3.3V low power half-duplex transceiver that RS-485 and RS-422 transceiver meets the specifications of the RS-485 and RS-422 serial protocols. Operates from a single 3.3V supply Interoperable with 5.0V logic This device is pin-to-pin compatible with the MaxLinear SP481, Driver/receiver enable SP483 and SP485 devices as well as popular industry standards. The -7V to +12V common-mode input voltage SP3485 can meet the electrical specifications of the RS-485 and RS- range 422 serial protocols up to 10Mbps under load. Allows up to 32 transceivers on the serial bus Compatibility with industry standard 75176 pinout Driver output short-circuit protection Ordering Information - Back Page Block Diagram RO 1 R 8 V CC RE 2 7 B DE 3 6 A DI 4 D 5 GND SP3485 1 Rev. 2.0.2 216DSR00SP3485 Absolute Maximum Ratings These are stress ratings only and functional operation of the Storage Temperature ...................................-65C to 150C device at these ratings or any other above those indicated Maximum Junction Temperature, T ..........................125C J in the operation sections of the specifications below is not Power Dissipation ....................................................600mW implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. (derate 6.90mW/C above 70C) V ...............................................................................6.0V CC Operating Conditions Input Voltages Package Power Dissipation Logic ..................................... -0.3V to 6.0V 8-pin NSOIC ................................................ 128.4C/W JA Drivers .................................. -0.3V to 6.0V ESD Rating Receivers ...........................................15V Human Body Model (HBM) .......................................... 2kV Outputs Drivers ...............................................15V Receivers .............................. -0.3V to 6.0V Receiver Output Current...........................................60mA Electrical Characteristics Unless otherwise noted: T = T to T and V = 3.3V 5%. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP3485 Driver DC Characteristics Differential output voltage Vcc Volts Unloaded R = Figure 1 Differential output voltage 2 Vcc Volts With Load R = 50 (RS-422) Figure 1 Differential output voltage 1.5 Vcc Volts With Load R = 27 (RS-485) Figure 1 Change in magnitude of driver differential output 0.2 Volts R = 27 or R = 50 Figure 1 voltage for complimentary states Driver common mode output voltage 3 Volts R = 27 or R = 50 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 250 mA -7V V +12V Figure 8 OUT O Driver short circuit current V = LOW 250 mA -7V V +12V Figure 8 OUT O SP3485 Driver AC Characteristics Maximum data rate 10 Mbps RE = V , DE = V CC CC Driver input to output, t 17 60 ns Figures 2 & 9 PLH Driver input to output, t 17 60 ns Figures 2 & 9 PHL Differential driver skew 2 10 ns t - t , Figures 2 and 10 DO1 DO2 Driver rise or fall time 5 20 ns From 10%-90% Figures 3 and 10 Driver enable to output high 35 120 ns Figures 4 and 11 Driver enable to output low 30 120 ns Figures 5 and 11 Driver disable time from low 20 120 ns Figures 5 and 11 Driver disable time from high 20 120 ns Figures 4 and 11 Driver enable from shutdown to output high, t 250 ns PSH C = 50pF, R = 500. L L Figures 4, 5, and 11 Driver enable from shutdown to output low, t 250 ns PSL Time to shutdown, t 50 200 600 ns Notes 1 and 2 SHDN 2 Rev. 2.0.2