MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication General Description Benefits and Features The MAX14784E/MAX14787E are optimized for communication over very long cables or short unterminated cables. Optimized for Performance in Harsh Industrial Environments * 35kV ESD (HBM) Protection on RS-485 I/O Ports * Extended Operating Temperature Range * Slew-Rate Limited Outputs (MAX14784E/ MAX14787E) * Integrated Receiver Deglitch Filter Increases Noise Immunity (MAX14784E/MAX14787E/) * Short-Circuit Protected Outputs * True Fail-Safe Receiver * Thermal Shutdown The MAX14784E/MAX14786E/MAX14787E/MAX14789E full-duplex RS-485 transceivers are designed for robust communication in harsh industrial environments. All devices feature 35kV ESD protection on the RS-485 pins and operate from a 3V to 5.5V supply with a 4mA no-load supply current (max). The MAX14784E/MAX14786E are available in a 14-pin SO package and operate over the -40C to +125C temperature range. The MAX14786E is also available in a 14-pin TSSOP package. The MAX14787E/MAX14789E are optimized for spaceconstrained applications and are available in an 8-pin SO package, operating over the -40C to +105C temperature range. Applications Flexibility * Use in Full-Duplex or Half-Duplex Applications * Wide 3.0V to 5.5V Supply Voltage Range * Available with 500kbps and 25Mbps Speed Options * Available in 8-Pin and 14-Pin SO and TSSOP Packages 1/4-Unit Load Allows up to 128 Transceivers on the Bus Motion Controllers Encoder Interfaces HVAC Control Systems Utility Meters Ordering Information appears at end of data sheet. Functional Diagram A RO R RE B A RO R RE VCC DI Z D Y MAX14784E MAX14786E 19-6863; Rev 2; 1/15 VCC SHUTDOWN DE B DE DI Z D Y MAX14787E MAX14789E MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Absolute Maximum Ratings (All voltages referenced to GND.) VCC ......................................................................-0.3V to +6.0V RE, RO...................................................... -0.3V to (VCC + 0.3)V DE, DI....................................................................-0.3V to +6.0V A, B, Y, Z ............................................................-8.0V to +13.0V Short-Circuit Duration.................................................Continuous Continuous Power Dissipation (TA = +70C) 8 SO (derate 7.6mW/C above +70C)........................606mW 14 SO (derate 11.9mW/C above +70C)....................952mW TSSOP (derate 10mW/C above +70C).....................796mW Operating Temperature Range 8 SO.............................................................. -40C to +105C 14 SO............................................................ -40C to +125C TSSOP........................................................... -40C to +125C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C Soldering Temperature (reflow)........................................+260C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 1) Junction-to-Case Thermal Resistance (JC) Junction-to-Ambient Thermal Resistance (JA) 8 SO.............................................................................38C/W 8 SO...........................................................................132C/W 14 SO...........................................................................34C/W 14 SO...........................................................................84C/W TSSOP..........................................................................30C/W TSSOP..........................................................................30C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25C.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V 1.9 4 mA 5 10 A POWER SUPPLY Supply Voltage Supply Current Shutdown Supply Current VCC ICC ISHDN 3.0 DE = high, RE = low, no load DE = low, RE = high DRIVER Differential Driver Output VOD RL = 54, VCC = 4.5V, Figure 1 2.1 RL = 100, VCC = 3.0V, Figure 1 2.0 RL = 54, VCC = 3.0V, Figure 1 1.5 Change in Magnitude of Differential Driver Output Voltage VOD RL = 100 or 54, Figure 1 (Note 4) Driver Common-Mode Output Voltage VOC RL = 100 or 54, Figure 1 (Note 4) VOC RL = 100 or 54, Figure 1 (Note 4) Change in Magnitude of Driver Common-Mode Output Voltage Single-Ended Driver Output Voltage High VOH Y and Z outputs, IY,Z = -20mA Single-Ended Driver Output Votlage Low VOL Y and Z outputs, IY,Z = +20mA Differential Driver Output Capacitance COD DE = RE = high, f = 4MHz www.maximintegrated.com V VCC/2 0.2 V 3 V 0.2 V 2.2 V 0.8 12 V pF Maxim Integrated 2 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Electrical Characteristics (continued) (VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25C.) (Notes 2, 3) PARAMETER SYMBOL Peak Driver Short-Circuit Output Current IOSD CONDITIONS MIN TYP MAX 0V VOUT +12V, output low +40 +250 -7V VOUT VCC, output high -250 -40 UNITS mA RECEIVER Input Current (A and B) IA,B DE = low, VCC = 0V or 3.6V Differential Input Capacitance CA,B Measured between A and B, DE = low, f = 2MHz Receiver Differential Threshold Voltage VTH -7V VOUT +12V VIN = +12V VIN = -7V +250 -200 12 -200 pF -10 20 mV Receiver Input Hysteresis VTH Receiver Input Resistance RIN -7V VCM +12V 48 k Input High Voltage VIH DE, DI, RE 2.0 V Input Low Voltage VIL DE, DI, RE Input Current IIN DI RE Pulldown and DE Pullup Input Resistance RIN Receiver Output High Voltage VOH RE = low, IOUT = -1mA, (VA - VB) > 200mV Receiver Output Low Voltage VOL RE = low, IOUT = +1mA, (VA - VB) < -200mV Receiver Output Three-State Current IOZR RE = high, 0V VRO VCC Receiver Output Short-Circuit Current IOSR RE = low, 0V VRO VCC LOGIC INTERFACE (DI, DE, RE, RO) VCM = 0V -120 A -2 mV 0.8 V +2 A 1 M VCC 1.5 V 0.4 V -1 +1 A -95 +95 mA PROTECTION Thermal Shutdown Threshold TSHDN Thermal Shutdown Hysteresis TSHDN ESD Protection (A, B, Y and Z Pins) ESD Protection (All Other Pins) www.maximintegrated.com Temperature rising +160 C 10 C IEC 61000-4-2 Air Gap Discharge to GND 18 IEC 61000-4-2 Contact Discharge to GND 8 Human Body Model 35 Human Body Model 2 kV kV Maxim Integrated 3 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Switching Characteristics (MAX14784E/MAX14787E) (VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25C.) (Notes 2, 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER Driver Propagation Delay tDPLH tDPHL 1000 RL = 54, CL = 50pF, Figures 2, 3 1000 ns Differential Driver Output Skew |tDPLH - tDPHL| tDSKEW RL = 54, CL = 50pF, Figures 2, 3 (Note 6) 140 ns Driver Differential Output Rise or Fall Time tHL, tLH RL = 54, CL = 50pF, Figures 2, 3 900 ns Maximum Data Rate DRMAX RL = 110, CL = 50pF, Figures 4, 5 tDZH RL = 110, CL = 50pF, Figures 4, 5 2500 ns Driver Enable to Output Low tDZL RL = 110, CL = 50pF, Figures 4, 5 2500 ns Driver Disable Time from Low tDLZ RL = 110, CL = 50pF, Figures 4, 5 100 ns Driver Disable Time from High tDHZ RL = 110, CL = 50pF, Figures 4, 5 100 ns Driver Enable from Shutdown to Output High tDZH(SHDN) RL = 110, CL = 15pF, Figures 4, 5 100 s Driver Enable from Shutdown to Output Low tDZL(SHDN) RL = 110, CL = 15pF, Figures 4, 5 100 s 800 ns Driver Enable to Output High Time to Shutdown tSHDN (Note 7) 500 50 kbps RECEIVER Receiver Propagation Delay tRPLH tRPHL Receiver Output Skew |tRPLH - tRPHL| tRSKEW Maximum Data Rate DRMAX 200 CL = 15pF, Figures 6, 7 200 CL = 15pF, Figures 6, 7 (Note 6) 30 500 ns ns kbps Receiver Enable to Output High tRZH RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Enable to Output Low tRZL RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Disable Time from Low tRLZ RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Disable Time from High tRHZ RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Enable from Shutdown to Output High tRZH(SHDN) RL = 1k, CL = 15pF, Figure 8 100 s Receiver Enable from Shutdown to Output Low tRZL(SHDN) RL = 1k, CL = 15pF, Figure 8 100 s 800 ns Time to Shutdown www.maximintegrated.com tSHDN (Note 7) 50 Maxim Integrated 4 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Switching Characteristics (MAX14786E/MAX14789E) (VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25C.) (Notes 2, 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER Driver Propagation Delay tDPLH tDPHL 25 RL = 54, CL = 50pF, Figures 2, 3 25 ns Differential Driver Output Skew |tDPLH - tDPHL| tDSKEW RL = 54, CL = 50pF, Figures 2, 3 (Note 6) 3 ns Driver Differential Output Rise or Fall Time tHL, tLH RL = 54, CL = 50pF, Figures 2, 3 10 ns Maximum Data Rate DRMAX RL = 110, CL = 50pF, Figures 4, 5 tDZH RL = 110, CL = 50pF, Figures 4, 5 40 ns Driver Enable to Output Low tDZL RL = 110, CL = 50pF, Figures 4, 5 40 ns Driver Disable Time from Low tDLZ RL = 110, CL = 50pF, Figures 4, 5 40 ns Driver Disable Time from High tDHZ RL = 110, CL = 50pF, Figures 4, 5 40 ns Driver Enable from Shutdown to Output High tDZH(SHDN) RL = 110, CL = 15pF, Figures 4, 5 100 s Driver Enable from Shutdown to Output Low tDZL(SHDN) RL = 110, CL = 15pF, Figures 4, 5 100 s 800 ns Driver Enable to Output High Time to Shutdown tSHDN (Note 7) 25 50 Mbps RECEIVER Receiver Propagation Delay tRPLH tRPHL Receiver Output Skew |tRPLH - tRPHL| tRSKEW Maximum Data Rate DRMAX 25 CL = 15pF, Figures 6, 7 25 CL = 15pF, Figures 6, 7 (Note 6) 3 25 ns ns Mbps Receiver Enable to Output High tRZH RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Enable to Output Low tRZL RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Disable Time from Low tRLZ RL = 1k, CL = 15pF, Figure 8 30 ns Receiver Disable Time from High tRHZ RL = 1k, CL = 15pF, Figure 8 30 ns tRZH(SHDN) RL = 1k, CL = 15pF, Figure 8 100 s Receiver Enable from Shutdown to Output High www.maximintegrated.com Maxim Integrated 5 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Switching Characteristics (MAX14786E/MAX14789E) (continued) (VCC = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, and TA = +25C.) (Notes 2, 5) PARAMETER SYMBOL Receiver Enable from Shutdown to Output Low tRZL(SHDN) Time to Shutdown tSHDN CONDITIONS MIN TYP RL = 1k, CL = 15pF, Figure 8 (Note 7) 50 MAX UNITS 100 s 800 ns Note 2: All devices 100% production tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 3: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to ground, unless otherwise noted. Note 4: VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 5: Capacitive load includes test fixture. Note 6: Not production tested. Guaranteed by design. Note 7: Shutdown is enabled by bringing RE high and DE low. If the enabled inputs are in this state for less than 50ns, the device is guaranteed to not enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to have entered shutdown. VCC Y DE RL 2 Y DI Z VOD RL 2 VOD RL CL VOC Z Figure 2. Driver Timing Test Circuit Figure 1. Driver DC Test Load f = 1MHz, tLH 3ns, tHL 3ns VCC 1.5V DI 1.5V 0 tDPLH 1/2 VO tDPHL Z Y 1/2 VO VO VDIFF = VY - VZ VO VDIFF 80% 80% 0 20% 20% -VO tLH tHL tDSKEW = |tDPLH - tDPHL| Figure 3. Driver Propagation Delays www.maximintegrated.com Maxim Integrated 6 MAX14784E/MAX14786E/ MAX14787E/MAX14789E 0 OR VCC DI D Y Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication S1 CL Z VCC OUT DE RL 1.5V tDZH, tDZH(SHDN) DE GENERATOR 0 0.25V OUT 50 VOH 1.5V 0 tDHZ Figure 4. Driver Enable and Disable Times (tDZH, tDHZ, tDZH(SHDN)) VCC 0 OR VCC DI D Y RL S1 Z OUT CL DE GENERATOR A 50 ATE R VID RECEIVER OUTPUT B VCC DE VCC OUT tDZL, tDZL(SHDN) 1.5V 0 tDLZ 1.5V VOL 0.25V Figure 6. Receiver Propagation Delay Test Circuit Figure 5. Driver Enable and Disable Times (tDZL, tDLZ, tDZL(SHDN)) t = 1MHz, tLH 3ns, tHL 3ns A 1V B VOH RO -1V tRPHL tRPLH 1.5V VOL 1.5V tRSKEW = |tRPHL - tRPLH| Figure 7. Receiver Propagation Delays www.maximintegrated.com Maxim Integrated 7 MAX14784E/MAX14786E/ MAX14787E/MAX14789E +1.5V Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication S3 -1.5V VID R RE GENERATOR RO RL 1kI S1 VCC S2 CL 15pF 50I VCC 1.5V RE tRZH, tRZH (SHDN) 0 VCC S1 OPEN S2 CLOSED S3 = +1.5V 1.5V RE 0 S1 CLOSED S2 OPEN S3 = -1.5V tRZL, tRZL(SHDN) RO VOH VCC 2 0 VCC 1.5V RE 0 VCC 2 0.25V VOL RO VCC S1 OPEN S2 CLOSED S3 = +1.5V 1.5V S1 CLOSED S2 OPEN S3 = -1.5V 0 RE tRLZ tRHZ RO VCC VCC VOH 0 RO 0.25V VOL Figure 8. Receiver Enable and Disable Times www.maximintegrated.com Maxim Integrated 8 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Typical Operating Characteristics (VCC = 5V, TA = +25C, unless otherwise noted.) 4.0 toc01 SHUTDOWN SUPPLY CURRENT (A) 3.0 2.5 VCC = 5V VCC = 3.3V 2.0 1.5 1.0 DE = VCC RE = GND NO LOAD Y and Z OPEN 0.5 -40 -25 -10 5 8 VCC = 5V VCC = 3.3V 5 4 3 2 0 -40 -25 -10 5 30 toc05 4.5 3.5 50 VCC = 5V 3.0 2.5 2.0 5V, NO LOAD VOH (V) VOH (V) 3.3V, 54 LOAD 1.0 10 0.5 0.5 0 0.0 5.0 20 25 20 30 40 50 OUTPUT CURRENT (mA) DIFFERENTIAL DRIVER OUTPUT VOLTAGE vs. TEMPERATURE MAX14784E/MAX14787E DRIVER PROPAGATION DELAY vs. TEMPERATURE toc07 600 VCC = 5V 4.0 3.5 3.0 2.5 2.0 VCC = 3.3V 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) www.maximintegrated.com 0.0 60 toc08 30.0 550 500 25.0 tDPLH, VCC = 5V 450 tDPHL, VCC = 5V 400 350 300 tDPHL, VCC = 3.3V 200 -40 -25 -10 5 500 toc06 VCC = 3.3V tDPLH, VCC = 3.3V 20 35 50 65 80 95 110 125 TEMPERATURE (C) 0 10 20 30 40 50 60 OUTPUT CURRENT (mA) 250 0.5 0.0 10 DATA RATE (Mbps) 4.5 1.5 0 400 2.0 VCC = 3.3V 1.5 15 300 VCC = 5V 2.5 1.0 10 200 OUTPUT SINKING CURRENT 3.0 1.5 3.3V, NO LOAD 5 100 RECEIVER OUTPUT LOW VOLTAGE vs. OUTPUT CURRENT 4.5 4.0 0 0 5.0 OUTPUT SOURCING CURRENT 3.5 30 3.3V, no load DATA RATE (kbps) 70 40 5V, no load 20 4.0 60 3.3V, 54 load 40 80 20 VOD (V) 50 0 20 35 50 65 80 95 110 125 RECEIVER OUTPUT HIGH VOLTAGE vs. OUTPUT CURRENT 5.0 PROPAGATION DELAY (ns) SUPPLY CURRENT (mA) 90 toc04 5V, 54 LOAD DE = VCC RE = GND 60 TEMPERATURE (C) MAX14786E/MAX14789E SUPPLY CURRENT vs. DATA RATE toc03 5V, 54 load 10 1 20 35 50 65 80 95 110 125 DE = VCC RE = GND 70 7 6 MAX14784E/MAX14787E SUPPLY CURRENT vs. DATA RATE 80 DE = GND RE = VCC TEMPERATURE (C) 100 toc02 PROPAGATION DELAY (ns) SUPPLY CURRENT (mA) 10 9 3.5 0.0 MAX14784E/MAX14786E SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT (mA) NO LOAD SUPPLY CURRENT vs.TEMPERATURE MAX14786E/MAX14789E DRIVER PROPAGATION DELAY vs. TEMPERATURE RL = 54 CL = 50pF tDPHL, VCC = 3.3V toc09 tDPLH , VCC = 3.3V 20.0 15.0 10.0 tDPHL, VCC = 5V tDPLH , VCC = 5V 5.0 0.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) Maxim Integrated 9 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Typical Operating Characteristics (continued) (VCC = 5V, TA = +25C, unless otherwise noted.) 40 30 5 RL = 54 CL = 50pF 3 VCC = 5V 0 -10 VCC = 3.3V -20 900 1 0 -1 VCC = 3.3V 400 300 200 -40 -4 100 -50 -5 0 20 35 50 65 80 95 110 125 -40 -25 -10 5 6 20 35 50 65 80 95 110 125 100 tHL, VCC = 3.3V tLH, VCC = 3.3V 2 tLH, VCC = 5V 1 tHL, VCC = 5V 80 MAX14784E/MAX14787E DRIVER OUTPUT TRANSITION SKEW vs. TEMPERATURE toc14 RL = 54 CL = 50pF 70 60 VCC = 3.3V 50 VCC = 5V 40 30 20 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) MAX14786E/MAX14789E DRIVER OUTPUT TRANSITION SKEW vs. TEMPERATURE toc15 MAX14784E/MAX14787E PROPAGATION DELAY toc16 DI 5V/div (ACCOUPLED) 5V/div 0.5 0.4 VCC = 3.3V 0.3 Y/A 2V/div VCC = 5V Z/B 2V/div 0.2 RO 5V/div 0.1 0.0 20 35 50 65 80 95 110 125 10 TEMPERATURE (C) OUTPUT TRANSITION SKEW (ns) OUTPUT TRANSITION SKEW (ns) RISE/FALL TIME (ns) 4 0.6 -40 -25 -10 5 tLH, VCC = 3.3V TEMPERATURE (C) 90 5 0 tHL, VCC = 3.3V TEMPERATURE (C) MAX14786E/MAX14789E DRIVER OUTPUT RISE AND FALL TIME vs. TEMPERATURE toc13 3 tHL, VCC = 5V 500 -3 TEMPERATURE (C) tLH, VCC = 5V 600 -30 -40 -25 -10 5 toc12 RL = 54 CL = 50pF 700 VCC = 5V -2 MAX14784E/MAX14787E DRIVER OUTPUT RISE AND FALL TIME vs. TEMPERATURE 800 2 10 toc11 RL = 54 54 CL = 50pF 4 tDSKEW (ns) tDSKEW (ns) 20 toc10 MAX14786E/MAX14789E DIFFERENTIAL DRIVER SKEW vs. TEMPERATURE RISE/FALL TIME (ns) 50 MAX14784E/MAX14787E DIFFERENTIAL DRIVER SKEW vs. TEMPERATURE LOOPBACK CONFIGURATION -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) www.maximintegrated.com 100ns Maxim Integrated 10 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Typical Operating Characteristics (continued) (VCC = 5V, TA = +25C, unless otherwise noted.) MAX14784E/MAX14787E PROPAGATION DELAY MAX14786E/MAX14789E PROPAGATION DELAY toc17 DI 5V/div DI 5V/div Z/B 2V/div Y/A 2V/div Z/B 2V/div Z/B 2V/div Y/A 2V/div RO 5V/div RO 5V/div RO 5V/div 100ns www.maximintegrated.com toc19 DI 5V/div (ACCOUPLED) 5V/div Y/A 2V/div LOOPBACK CONFIGURATION MAX14786E/MAX14789E PROPAGATION DELAY toc18 LOOPBACK CONFIGURATION 10ns LOOPBACK CONFIGURATION 10ns Maxim Integrated 11 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Pin Configurations TOP VIEW N.C. 1 + 14 VCC RO 2 13 N.C. RE 3 MAX14784E MAX14786E DE 4 12 A 11 B DI 5 10 Z GND 6 9 Y GND 7 8 N.C. VCC 1 RO 2 DI GND + 8 A 7 B 3 6 Z 4 5 Y MAX14787E MAX14789E SO SO/TSSOP Pin Description PIN MAX14784E MAX14786E MAX14787E MAX14789E NAME 1, 8, 13 -- N.C. No Connection. Not internally connected. 2 2 RO Receiver Output. Drive RE low to enable RO. RO is always active on the MAX14787E and the MAX14789E. See the Function Tables section. 3 -- RE Receiver Enable. Drive RE low, or leave unconnected, to enable RO. RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. RE has a weak pulldown to GND. 4 -- DE Driver Enable. Drive DE high, or leave unconnected, to enable the driver outputs. The driver outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode (MAX14784E and MAX14786E only). Driver Input. Drive DE high on the MAX14784E and MAX14786E to enable the driver outputs. Driver outputs are always active on the MAX14787E and the MAX14789E. A low on DI forces the noninverting output, Y, low and the inverting output, Z, high. Similarly, a high on DI forces the noninverting output, Y, high and the inverting output, Z, low. DE has a weak pullup to VCC. 5 3 DI 6, 7 4 GND FUNCTION Ground 9 5 Y Noninverting Driver Output 10 6 Z Inverting Driver Output 11 7 B Inverting Receiver Input 12 8 A Noninverting Receiver Input 14 1 VCC www.maximintegrated.com Positive Supply. Bypass VCC to GND with a 0.1F capacitor as close as possible to the IC. Maxim Integrated 12 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Function Tables TRANSMITTING INPUTS RE* OUTPUTS DE* DI Y Z X 1 1 1 0 X 1 0 0 1 0 0 X High-Impedance 1 0 X Shutdown RECEIVING RE* INPUTS OUTPUT DE* VA - VB RO 0 X -10mV 1 0 X -200mV 0 0 X Open/shorted 1 1 1 X High-Impedance 1 0 X Shutdown *RE and DE on the MAX14787E and MAX14789E are internal. The driver outputs and receiver are always active in these devices. Detailed Description True Fail-Safe The MAX14784E/MAX14786E/MAX14787E/MAX14789E are 35kV ESD protected RS-485 transceivers intended for high-speed, full-duplex communication. These devices operate from a +3.0V to +5.5V supply and feature true fail-safe circuitry, guaranteeing a logic high on the receiver output when inputs are open or shorted. The MAX14784E/MAX14786E/MAX14787E/MAX14789E guarantee a logic-high receiver output when either the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. If the differential receiver input voltage (VA - VB) is greater than or equal to -10mV, RO is logic-high. The MAX14784E and MAX14787E feature a slew-rate limited driver that minimizes EMI and reduces reflections caused by improperly-terminated cables, allowing errorfree data transmission at data rates up to 500kbps. The MAX14784E/MAX14787E feature an added deglitch filter on the receiver signal path for enhanced noise immunity when differential signals have very slow rise and fall times. Driver outputs are short-circuit current-limited, with thermal shutdown circuitry that protects drivers against excessive power dissipation. Receiver Input Deglitch Filter (MAX14784E/ MAX14787E Only) The MAX14784E/MAX14786E/MAX14787E/MAX14789E transceivers draw 4mA (max) of supply current when unloaded, or when fully-loaded with the drivers disabled. The MAX14784E and MAX14786E draw less than 10A (max) of supply current in low-power shutdown mode. www.maximintegrated.com The MAX14784E/MAX14787E include integrated circuitry to filter received data. This input deglitch filter reduces false triggers that can occur when data is passed over long cables. To minimize impact on the bus, the integrated filter is not connected to the receiver inputs. Instead, data is filtered after the differential receiver input but before reaching RO. Driver Single-Ended Operation The Y and Z outputs can either be used in the standard differential operating mode, or can be used a singleended outputs. Since the Y and Z driver outputs swing rail-to-rail, they can individually be used as standard TTL logic outputs. Maxim Integrated 13 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Half-Duplex Operation The MAX14784E/MAX14786E are full-duplex transceivers with driver and receiver enable/disable functionality. To use these devices in a half-duplex configuration, connect the Y output to the A input and connect the Z output to the B input. Driver Output Protection Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a current limit on the output stage, provides immediate protection against short-circuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, force the driver outputs into a high-impedance state if the die temperature exceeds +160C (typ). Low-Power Shutdown Mode (MAX14784E/ MAX14786E Only) Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the devices draw only 10A (max) of supply current. RE and DE can be driven simultaneously; the devices are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 800ns, the devices are guaranteed to enter shutdown. 35kV ESD Protection ESD protection structures are incorporated on all pins to protect against electrostatic discharge encountered during handling and assembly. The driver outputs and receiver inputs of the MAX14784E/MAX14786E/MAX14787E/ MAX14789E have extra protection against static electricity. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the devices keep working without latchup or damage. Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model (HBM) Figure 9 shows the HBM test model, while Figure 10 shows the current waveform it generates when discharged in a low-impedance state. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor. IEC 61000-4-2 The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The MAX14784E/ MAX14786E/MAX14787E/MAX14789E help facilitate designing equipment to meet the IEC 61000-4-2 specification without the need for additional ESD protection components. The major difference between tests performed using the HBM and IEC 61000-4-2 is higher peak current in IEC 61000-4-2 due to lower series resistance in the IEC 61000-4-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is generally lower than that measured using the HBM. Figure 11 shows the IEC 61000-4-2 model, while Figure 12 shows the current waveform for IEC 61000-4-2 ESD Contact Discharge Test. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the MAX14784E/ MAX14786E/MAX14787E/MAX14789E are characterized for protection to the following limits: 35kV HBM 18kV using the Air-Gap Discharge method specified in IEC 61000-4-2 8kV using the Contact Discharge method specified in the IEC 61000-4-2 www.maximintegrated.com Maxim Integrated 14 MAX14784E/MAX14786E/ MAX14787E/MAX14789E RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication RD 1500 IP 100% 90% DISCHARGE RESISTANCE AMPS DEVICE UNDER TEST STORAGE CAPACITOR 36.8% 10% 0 0 Figure 9. Human Body ESD Test Model RC 50M TO 100M HIGHVOLTAGE DC SOURCE Cs 150pF TIME tRL tDL CURRENT WAVEFORM Figure 10. Human Body Current Waveform RD 330 I 100% 90% DISCHARGE RESISTANCE IPEAK CHARGE-CURRENTLIMIT RESISTOR PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Ir DEVICE UNDER TEST STORAGE CAPACITOR 10% tr = 0.7ns TO 1ns t 30ns 60ns Figure 11. IEC 61000-4-2 ESD Test Model Figure 12. IEC 61000-4-2 ESD Generator Current Waveform Typical Application Circuit MASTER RO A Y B Z Z B D R RE DE DI SLAVE RE RO A Y Z A B Y Z R MAX14784E MAX14786E D D DI A B R Y DE RE SLAVE www.maximintegrated.com DE R D DI RO DI DE RE RO SLAVE Maxim Integrated 15 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Typical Application Circuit (continued) Y A RO DI D R B Z Z B DI R D RO A Y MAX14787E MAX14789E Ordering Information/Selector Guide PART DATA RATE (MAX) DRIVER SLEWRATE LIMITED DEGLITCHED RECEIVER SIGNAL DRIVER/ RECEIVER ENABLE TEMP RANGE MAX14784EASD+ 500kbps Yes Yes Yes -40C to +125C 14 SO MAX14786EASD+ 25Mbps No No Yes -40C to +125C 14 SO MAX14786EAUD+ 25Mbps No No Yes -40C to +125C 14 TSSOP MAX14787EGSA+ 500kbps Yes Yes No -40C to +105C 8 SO MAX14789EGSA+ 25Mbps No No No -40C to +105C 8 SO PINPACKAGE +Denotes a lead(Pb)-free/RoHS-compliant package. Chip Information PROCESS: BiCMOS www.maximintegrated.com Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SO S8+4 21-0041 90-0096 14 SO S14+1 21-0041 90-0112 14 TSSOP U14+1 21-0066 90-0113 Maxim Integrated 16 MAX14784E/MAX14786E/ MAX14787E/MAX14789E Full-Duplex, 35kV ESD-Protected, RS-485 Transceivers for High-Speed Communication Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 12/13 Initial release -- 1 6/14 Removed future product asterisk from MAX14789E 1 2 1/15 Updated General Description and Benefits and Features sections 1 DESCRIPTION For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2015 Maxim Integrated Products, Inc. 17