Datasheet Standard Products DRS4485 Dual RS485 Interface Transceiver Radiation Tolerant www.aeroflex.com/RadHard December 5, 2014 FEATURES Radiation Performance - Total dose > 100 krad (Si) Designed for RS485 and RS422 Interface Applications Single +5V supply +5V to -7V Bus common mode range source output Driver maintains high impedance in three-state or with the power off Combined Impedance of a driver output and receiver allows up to 32 transceivers on the bus 200 mV typical input hysteresis Serial data rate 500KHz maximum Voltage source output Receiver output Hi for VIN Diff = 0V < 5ns skew between BUS and BUSN complementary outputs Monolithic construction Designed for commercial, industrial and aerospace applications Plainview is a Class H & K MIL-PRF-38534 manufacturer Packaging – Hermetic Flat Package - 18-lead, 0.63"sq x 0.125"Ht - Weight - 3.50 grams max Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G. GENERAL DESCRIPTION The Aeroflex-Plainview DRS4485 is a monolithic dual bus/line transceiver designed for multi-point data transmission standard RS485 applications. The DRS4485 meets TIA/EIA -485 requirements. The receiver has a fail-safe feature which guarantees a high output state when the BUS is open or shorted. VCC DI DR BUS BUSN DE Channel 1 or 2 Rx OUT Rx Rx EN GND FIGURE 1 – SCHEMATIC SCD4485 Rev G ABSOLUTE MAXIMUM RATINGS Parameter Range Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Power Supply Voltages (VCC) +12VDC Control Input Voltage -0.5 VDC to Vcc + 0.5VDC Driver Input Voltage -0.5 VDC to Vcc + 0.5VDC Driver Output Voltage ±5V Receiver Input Voltage ±5V Receiver Output Voltages -0.5 VDC to Vcc + 0.5VDC NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating only; functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions" may affect device reliability. ELECTRICAL CHARACTERISTICS 2/ 4/ Parameter Differential driver output voltage (unloaded) Condition Symbol Min Typ Max Unit IO = 0 VOD1 2.5 3.0 5 Vp-p VOD2 2.5 3.0 5 Vp-p VOD - - 0.2 Vp-p VOC - 2.55 3 V |VOC - - 0.2 V VIH 2.4 Differential driver output voltage (with load) 1/ Change in magnitude of driver differential output Voltage for complementary states See Figure 2 Driver common mode output voltage Change in magnitude of driver common-mode output Voltage for complementary states Input high voltage DE, DI, RE Input low voltage Input current 1/ - - V VIL - 0.8 V IIN ±1 ±2 µA -6.5V £ VCM £ +5V VTH -0.5 -0.2 -0.1 V VCM = 0 VTH - 160 400 mV Receiver output high voltage 1/ IO = -0.4mA VOH 4.0 - - V Receiver output low voltage 1/ IO = 0.4mA VOL - - 0.5 V Receiver input differential resistance 3/ - RIN DIFF 30K - - Receiver input common-mode resistance 3/ - RIN CM 8K - - Driver short-circuit current 1/ - IOS 50 80 140 mA VOH to GND or VOL to Vcc IOSR 7 50 85 mA Differential input threshold voltage for receiver Receiver input hysteresis 3/ Receiver short-circuit current 1/ STATIC DC POWER SUPPLY CURRENTS 2/ Input Conditions Driver Output Conditions DI RE 0V X 5V HiZ X 0V LoZ NL 0V LoZ 60 W 5V X X Sym Min Typ Max Unit Output Output State Load DE 5V Channel Conditions DE=Driver En, DI=Driver In, RE=Receiver En SCD4485 Rev G 12/5/14 Channel 1 Driver ICC1 1/ ICC2 1/ ICC3 - 10 29 50 Receiver Channel 2 Driver Receiver 16 mA Disabled Disabled Disabled Disabled 40 mA Enabled Enabled Disabled Disabled 65 mA Enabled Enabled Disabled Disabled X=HiLo. 0V=GND. 5V=VDC. HiZ=high impedance. LoZ=low impedance. L=No Load 2 Aeroflex Plainview SWITCHING CHARACTERISTICS 4/ Parameter Condition Symbol Min Typ Max Unit Driver input to output delay tPLH - 125 200 nS Driver input to output delay tPHL - 80 150 nS tSKEW - 4 15 nS tr, tf - 100 150 nS Driver Output enable delay tZH - 160 250 nS Driver Output disable delay tLZ - 220 350 nS tPLH - 80 150 nS tPHL - 90 150 nS tr, tf - 26 50 nS tZL - 90 150 nS tZH - 120 150 nS RDIFF = 60W See test ckt Figure 2 Driver output to output delay Driver rise or fall time Receiver input to output delay IO = 0 See test ckt Figure 2 CL = 15pF Receiver rise or fall time Receiver enable delay Receiver disable delay Notes: 1/ The active element that makes up the device has been tested to 200krad(Si) to assure RHA designator level "R" (100krad(Si)) of method 1019, Condition A of MIL-STD-883 at +25°C for these parameters. The element will be retested after design or process changes that can affect RHA response of this element. Post Radiation test limits for the input current (IIN) test, is Max = ±3uA. 2/ Current measurements are for both channels. 3/ Not tested, guaranteed by design to the specified limits. 4/ Min/Max values are for VCC = +5V ±5%, TC = -55°C to +125°C. Typical values are measured at VCC = +5V and TC = +25°C. DRIVER FUNCTION TABLE Inputs DI RECEIVER FUNCTION TABLE Outputs DIFF Input BUS N RE Output > -100mV L H DE BUS H H/OPEN H L < -500mV L L L H/OPEN L H X H/OPEN H X L OFF HiZ OFF HiZ OPEN X H SHORT X H CSHLD 1500pF R 30 BUS VODIFF DI + CDIFF 200pF BUSN IOUT – R Voc 30 CL 15pF CSHLD 1500pF DE RX OUT RE FIGURE 2 – DRIVER/RECEIVER TIMING TEST CIRCUIT (Channel 1 or 2) SCD4485 Rev G 12/5/14 3 Aeroflex Plainview DI 3V 1.5V DI 1.5V 0V t PLH t PHL 1/2 VO VBUS VBUSN VOC VBUS VBUSN 1/2 VO tSKEW t SKEW VODIFF = VBUS – VBUSN VO 0V, VODIFF –VO 90% 80% 20% 10% tr tf FIGURE 3 – DRIVER SWITCHING WAVEFORMS FIGURE 3A – TYPICAL DRIVER OUTPUTS SCD4485 Rev G 12/5/14 4 Aeroflex Plainview FIGURE 3B – DRS4485 DRIVING 500FT OF BELDEN 3105A, 120Ω CABLE SCD4485 Rev G 12/5/14 5 Aeroflex Plainview VOH Rx Out VOL 1.5V 1.5V t PLH t PHL VODIFF VOD2 0V, VODIFF 0V –VOD2 FIGURE 4 – RECEIVER SWITCHING WAVEFORMS FIGURE 4A – TYPICAL RECEIVER OUTPUTS SCD4485 Rev G 12/5/14 6 Aeroflex Plainview PIN # vs FUNCTION TABLE Pin # Function Pin # Function 1 DRIVER ENABLE 1 10 VCC 2 RECEIVER ENABLE 1 11 GROUND 3 RECEIVER OUT 1 12 BUS 2 4 CASE_GND 13 BUSN 2 5 DRIVER IN 1 14 DRIVER IN 2 6 BUSN 1 15 NC_GND 7 BUS 1 16 RECEIVER OUT 2 8 GROUND 17 RECEIVER ENABLE 2 9 VCC 18 DRIVER ENABLE 2 18 10 DRS4485 88379 MADE IN THE USA 9 4X R.020 PACKAGE CONFIGURATION OUTLINE SCD4485 Rev G 12/5/14 7 Aeroflex Plainview ORDERING INFORMATION Model DLA SMD # Screening DRS4485-7 - Commercial Flow, +25°C testing only DRS4485-S - Military Temperature, -55°C to +125°C Screened in accordance with the individual Test Methods of MIL-STD-883 for Space Applications DRS4485-201-1S 5962-0922601KXC DRS4485-201-2S 5962-0922601KXA DRS4485-901-1S 5962R0922601KXC DRS4485-901-2S 5962R0922601KXA Case Flat Pack In accordance with DLA SMD In accordance with DLA Certified RHA Program Plan to RHA Level "R", 100krad(Si) EXPORT CONTROL: This product is controlled for export under the U.S. Department of Commerce (DoC). A license may be required prior to the export of this product from the United States. www.aeroflex.com/HiRel [email protected] Datasheet Definitions: Advanced Preliminary Datasheet Product in Development Shipping Non-Flight Prototypes Shipping QML and Reduced HiRel Aeroflex Plainview, Inc. reserves the right to make changes to any products and services described herein at any time without notice. Consult Aeroflex or an authorized sales representative to verify that the information in this data sheet is current before using this product. Aeroflex does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by Aeroflex; nor does the purchase, lease, or use of a product or service from Aeroflex convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual rights of Aeroflex or of third parties. SCD4485 Rev G 12/5/14 8 Our passion for performance is defined by three attributes. Solution-Minded Performance-Driven Customer-Focused