MAX3490ECSA-T

Click here for production status of specific part numbers. MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers General Description Features Devices in the MAX3483E family (MAX3483E/MAX3485E/ MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device contains one driver and one receiver. The MAX3483E and MAX3488E feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486E transmits up to 2.5Mbps. The MAX3485E, MAX3490E, and MAX3491E transmit at up to 12Mbps. ●● ESD Protection for RS-485 I/O Pins • ±15kV—Human Body Model • ±8kV—IEC 1000-4-2, Contact Discharge • ±15kV—IEC 1000-4-2, Air-Gap Discharge ●● Operate from a Single +3.3V Supply— No Charge Pump Required ●● Interoperable with +5V Logic ●● Guaranteed 12Mbps Data Rate (MAX3485E/MAX3490E/MAX3491E) ●● Slew-Rate Limited for Errorless Data Transmission (MAX3483E/MAX3488E) All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model. ●● 2nA Low-Current Shutdown Mode (MAX3483E/MAX3485E/MAX3486E/MAX3491E) ●● -7V to +12V Common-Mode Input Voltage Range ●● Full-Duplex and Half-Duplex Versions Available Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit. ●● Industry-Standard 75176 Pinout (MAX3483E/MAX3485E/MAX3486E) ●● Current-Limiting and Thermal Shutdown for Driver Overload Protection The MAX3488E, MAX3490E, and MAX3491E feature fullduplex communication, while the MAX3483E, MAX3485E, and MAX3486E are designed for half-duplex communication. Ordering Information Applications ●● ●● ●● ●● ●● Telecommunications Industrial-Control Local Area Networks Transceivers for EMI-Sensitive Applications Integrated Services Digital Networks Packet Switching PART TEMP. RANGE MAX3483ECSA 0°C to+70°C 8 SO PIN-PACKAGE MAX3483ECPA 0°C to+70°C 8 Plastic DIP MAX3483EESA -40°C to+85°C 8 SO MAX3483EEPA -40°C to+85°C 8 Plastic DIP Ordering Information continued at end of data sheet. Selector Guide PART NUMBER GUARANTEED DATA RATE (Mbps) MAX3483E 0.25 SUPPLY VOLTAGE (V) HALF/FULL DUPLEX SLEW-RATE LIMITED DRIVER/ RECEIVER ENABLE SHUTDOWN CURRENT (nA) ±15kV ESD PROTECTION PIN COUNT Half Yes Yes 2 Yes 8 MAX3485E 12 Half No Yes 2 Yes 8 MAX3486E 2.5 Half Yes Yes 2 Yes 8 MAX3488E 0.25 Full Yes No — Yes 8 MAX3490E 12 Full No No — Yes 8 MAX3491E 12 Full No Yes 2 Yes 14 19-1474; Rev 1; 5/19 3.0 to 3.6 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Absolute Maximum Ratings Supply Voltage (VCC).............................................................+7V Control Input Voltage (RE, DE)................................-0.3V to +7V Driver Input Voltage (DI)...........................................-0.3V to +7V Driver Output Voltage (A, B, Y, Z).......................-7.5V to +12.5V Receiver Input Voltage (A, B)..............................-7.5V to +12.5V Receiver Output Voltage (RO).................. -0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW 14-Pin SO (derate 8.33mW/°C above +70°C).................667mW 14-Pin Plastic DIP (derate 10mW/°C above +70°C)........800mW Operating Temperature Ranges MAX34_ _ EC_ _.................................................0°C to +70°C MAX34_ _ EE_ _............................................. -40°C to +85°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +150°C Lead Temperature (soldering, 10sec).............................. +300°C 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 Information TDFN-14 PACKAGE CODE S14+1 Outline Number 21-0041 Land Pattern Number 90-0112 Thermal Resistance, Single-Layer Board: Junction to Ambient (θJA) 120°C/W Junction to Case (θJC) 37°C/W Thermal Resistance, Four-Layer Board: Junction to Ambient (θJA) 84°C/W Junction to Case (θJC) 34°C/W 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 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. www.maximintegrated.com Maxim Integrated │  2 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DC Electrical Characteristics (VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Differential Driver Output SYMBOL VOD CONDITIONS MIN RL = 100Ω (RS-422), Figure 4 2.0 RL = 54Ω (RS-485), Figure 4 1.5 RL = 60Ω (RS-485), VCC = 3.3V, Figure 5 1.5 TYP MAX UNITS V Change in Magnitude of Driver Differential Output Voltage for Complementary Output States (Note 1) ∆VOD RL = 54Ω or 100Ω, Figure 4 0.2 V Driver Common-Mode Output Voltage VOC RL = 54Ω or 100Ω, Figure 4 3 V ∆VOC RL = 54Ω or 100Ω, Figure 4 0.2 V Change in Magnitude of Common-Mode Output Voltage (Note 1) Input High Voltage VIH DE, DI, RE Input Low Voltage VIL DE, DI, RE Logic Input Current IIN1 DE, DI, RE Input Current (A, B) IIN2 2.0 V 0.8 V ±2 μA DE = 0V, VCC = 0V or 3.6V VIN = 12V 1.0 VIN = -7V -0.8 Output Leakage (Y, Z) IO DE = 0V, RE = 0V, VCC = 0V or 3.6V, MAX3491E VOUT = 12V 20 VOUT = -7V -20 Output Leakage (Y, Z) in Shutdown Mode IO DE = 0V, RE = VCC, VCC = 0V or 3.6V, MAX3491E VOUT = 12V 1 VOUT = -7V -1 Receiver Differential Threshold Voltage VTH -7V ≤ VCM ≤ 12V -0.2 0.2 mA μA μA V Receiver Input Hysteresis ∆VTH VCM = 0V Receiver Output High Voltage VOH IOUT = -1.5mA, VID = 200mV, Figure 6 Receiver Output Low Voltage VOL IOUT = 2.5mA, VID = 200mV, Figure 6 0.4 V Three-State (High Impedance) Output Current at Receiver IOZR VCC = 3.6V, 0V ≤ VOUT ≤ VCC ±1 μA Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V Supply Voltage Range VCC www.maximintegrated.com 50 mV VCC - 0.4 V 12 3.0 kΩ 3.6 V Maxim Integrated │  3 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DC Electrical Characteristics (continued) (VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C) PARAMETER Supply Current SYMBOL ICC Supply Current in Shutdown Mode ISHDN Driver Short-Circuit Output Current IOSD Receiver Short-Circuit Output Current IOSR ESD Protection for Y, Z, A, B CONDITIONS No load, DI = 0 or VCC MIN DE = VCC, RE = 0 or VCC DE = 0V, RE = 0 DE = 0, RE = VCC, DI = VCC or 0 TYP MAX 1.1 2.2 0.95 1.9 0.002 VOUT = -7V 1 -250 VOUT = 12V 250 0 ≤ VRO ≤ VCC ±8 ±60 IEC 1000-4-2 Air Discharge ±15 IEC 1000-4-2 Contact Discharge (MAX3483E, MAX3485E, MAX3486E, MAX3491E) ±8 IEC 1000-4-2 Contact Discharge (MAX3490E, MAX3488E)* ±6 Human Body Model ±15 UNITS mA µA mA mA kV *MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999. Driver Switching Characteristics—MAX3485E/MAX3490E/MAX3491E (VCC = +3.3V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS Maximum Data Rate MIN TYP 12 15 MAX UNITS Mbps Driver Differential Output Delay tDD RL = 60Ω, Figure 7 1 22 35 ns Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 3 11 25 ns Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 7 23 35 ns Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 7 |tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 23 35 ns -1.4 ±8 ns DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only) Driver-Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 42 90 ns Driver-Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 42 90 ns Driver-Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 35 80 ns Driver-Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 35 80 ns Driver-Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 650 900 ns Driver-Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 650 900 ns www.maximintegrated.com Maxim Integrated │  4 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Driver Switching Characteristics—MAX3486E (VCC = +3.3V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS Maximum Data Rate MIN TYP MAX 2.5 Driver Differential Output Delay UNITS Mbps tDD RL = 60Ω, Figure 7 20 42 70 ns Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 15 28 60 ns Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 20 42 75 ns Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 20 42 75 ns |tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 -6 ±12 ns DRIVER-OUTPUT ENABLE/DISABLE TIMES Driver Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 52 100 ns Driver Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 52 100 ns Driver Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 40 80 ns Driver Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 40 80 ns Driver Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 700 1000 ns Driver Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 700 1000 ns TYP MAX UNITS Driver Switching Characteristics—MAX3483E/MAX3488E (VCC = +3.3V, TA = +25°C) PARAMETER SYMBOL CONDITIONS Maximum Data Rate MIN 250 kbps Driver Differential Output Delay tDD RL = 60Ω, Figure 7 600 900 1400 ns Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 400 740 1200 ns Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 700 930 1500 ns Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 700 930 1500 ns |tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 ±50 ns DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only) Driver-Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 900 1300 ns Driver-Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 600 800 ns Driver-Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 50 80 ns Driver-Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 50 80 ns Driver-Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 1.9 2.7 µs Driver-Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 2.2 3.0 µs www.maximintegrated.com Maxim Integrated │  5 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Receiver Switching Characteristics (VCC = +3.3V, TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Time to Shutdown tSHDN MAX3483E/MAX3485E/MAX3486E/MAX3491E only (Note 3) 80 190 300 ns Receiver Propagation Delay, Low-to-High Level tRPLH VID = 0 to 3.0, CL = 15pF, Figure 11 25 62 90 MAX3483E/MAX3488E 25 75 120 Receiver Propagation Delay, High-to-Low Level tRPHL VID = 0 to 3.0, CL = 15pF, Figure 11 25 62 90 MAX3483E/MAX3488E 25 75 120 |tPLH - tPHL| Receiver Propagation Delay Skew tRPDS VID = 0 to 3.0, CL = 15pF, Figure 11 6 ±10 MAX3483E/MAX3488E 12 ±20 Receiver Output Enable Time to Low Level tPRZL CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 25 50 ns Receiver Output Enable Time to High Level tPRZH CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 25 50 ns Receiver Output Disable Time from High Level tPRHZ CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 25 45 ns Receiver Output Disable Time from Low Level tPRLZ CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 25 45 ns Receiver Output Enable Time from Shutdown to Low Level tPRSL CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 720 1400 ns Receiver Output Enable Time from Shutdown to High Level tPRSH CL = 15pF, Figure 12, MAX3483E/85E/86E/91E only 720 1400 ns ns ns ns Note 1: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 2: Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|. Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section. www.maximintegrated.com Maxim Integrated │  6 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE TOC01 25 OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE TOC02 -20 15 10 -16 OUTPUT HIGH VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) -18 20 -14 -12 -10 -8 -6 -4 5 0.5 1.0 1.5 2.0 2.5 0 3.5 3.15 3.10 0 0.5 1.0 1.5 2.0 2.5 3.0 3.00 3.5 -40 -20 0 20 40 60 80 TEMPERATURE (°C) RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs.TEMPERATURE TOC04 TOC05 100 IRO = 2.5mA 2.6 90 OUTPUT CURRENT (mA) 0.6 0.5 0.4 0.3 0.2 80 70 60 50 40 30 20 0.1 10 -40 3.20 OUTPUT HIGH VOLTAGE (V) 0.7 0 3.25 OUTPUT LOW VOLTAGE (V) 0.8 OUTPUT LOW VOLTAGE (V) 3.0 DIFFERENTIAL OUTPUT VOLTAGE (V) 0 IRO = 1.5mA 3.05 -2 0 TOC03 3.30 -20 0 20 40 60 80 0 100 0 TEMPERATURE (°C) 0.5 1.0 1.5 2.0 2.5 3.0 DIFFERENTIAL OUTPUT VOLTAGE (V) OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE 175 TOC07 100 75 50 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) TOC08 -100 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 125 TOC06 R = 54Ω OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE 150 -80 -60 -40 -20 25 0 3.5 100 0 2 4 6 8 OUTPUT LOW VOLTAGE (V) www.maximintegrated.com 10 12 0 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 OUTPUT HIGH VOLTAGE (V) 4 5 Maxim Integrated │  7 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE TOC09 1.2 90 1.1 DE = VCC, RE = X 1.0 DE = 0, RE = 0 0.9 TOC10 100 X = DON’T CARE SHUTDOWN CURRENT (nA) SUPPLY CURRENT (mA) SHUTDOWN CURRENT vs. TEMPERATURE 0.8 80 70 60 50 40 30 20 10 0.7 -40 -20 0 20 40 60 80 0 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) Pin Description PIN MAX3483E MAX3485E MAX3486E MAX3488E MAX3490E MAX3491E 1 2 2 — NAME FUNCTION 2 RO Receiver Output. If A > B by 200mV, RO will be high; if A < B by 200mV, RO will be low. 3 RE Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE is high and DE is low, the device will enter a low-power shutdown mode. 3 — 4 DE Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high and DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the parts function as line drivers. While they are high impedance, they function as line receivers if RE is low. 4 3 5 DI Driver Input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low. 5 4 6, 7 GND Ground — 5 9 Y Noninverting Driver Output — 6 10 Z Inverting Driver Output 6 — — A Noninverting Receiver Input and Noninverting Driver Output — 8 12 A Noninverting Receiver Input 7 — — B Inverting Receiver Input and Inverting Driver Output Inverting Receiver Input — 7 11 B 8 1 13, 14 VCC Positive Supply: 3.0V ≤ VCC ≤ 3.6V. Do not operate device with VCC > 3.6V — — 1, 8 N.C. No Connection. Not internally connected. www.maximintegrated.com Maxim Integrated │  8 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers TOP VIEW R 1 RO RO 1 8 VCC RE 2 7 B RE 2 DE 3 6 A DE 3 5 GND DI 4 D DI 4 R 8 VCC 7 B Rt 6 A 5 GND D MAX3483E MAX3485E MAX3486E DE Rt D B A DI RO R RE SO/DIP NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH. Figure 1. MAX3483E/MAX3485E/MAX3486E Pin Configuration and Typical Operating Circuit TOP VIEW VCC 8 A RO 2 7 B DI 3 6 Z 5 Y VCC 1 GND 4 R D DI RO 3 5 Y D Rt 6 Z 8 A 2 VCC MAX3488E MAX3490E 1 R 7 R RO Rt D DI B SO/DIP 4 GND GND Figure 2. MAX3488E/MAX3490E Pin Configuration and Typical Operating Circuit TOP VIEW DE 4 N.C. 1 RO 2 RE 3 12 A DE 4 11 B DI 5 10 Z GND 6 GND 7 VCC 13, 14 14 V CC R D SO/DIP 13 V CC 9 Y 8 N.C. DI RO N.C. 5 9 D 10 12 2 R 11 1, 8 3 VCC RE MAX3491E Y Rt R RO Z A Rt D DI B 6, 7 RE GND GND DE Figure 3. MAX3491E Pin Configuration and Typical Operating Circuit www.maximintegrated.com Maxim Integrated │  9 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 375Ω RL 2 VOD D D RL VCC VCM = -7V to +12V RL VOD VOC 2 VCC Figure 4. Driver VOD and VOC 375Ω Figure 5. Driver VOD with Varying Common-Mode Voltage VID R 0V VOL IOL (+) VOH IOH (-) Figure 6. Receiver VOH and VOL 3V IN 1.5V 1.5V CL D GENERATOR (NOTE 4) 0V RL = 60Ω OUT tDO 50Ω VCC OUT CL CL = 15pF (NOTE 5) 50% 10% tTD tDO 90% 90% ≈ 2.0V 50% 10% ≈ -2.0V tTD Figure 7. Driver Differential Output Delay and Transition Times www.maximintegrated.com Maxim Integrated │  10 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 3V VOM IN 1.5V 1.5V RL = 27Ω 0V S1 GENERATOR (NOTE 4) tPLH OUT D 50Ω CL = 15pF (NOTE 5) VCC VOM = VOH + VOL 2 tPHL VOH Y OUT VOM VOM VOL tPHL ≈ 1.5V tPLH VOH Z OUT VOM VOM VOL Figure 8. Driver Propagation Times 3V S1 0V OR 3V GENERATOR (NOTE 4) OUT D IN 0V RL = 110Ω CL = 50pF (NOTE 5) 1.5V 1.5V tPZH tPHZ 50Ω OUT VOM = VOH + VOL 2 0.25V VOM ≈ 1.5V VOH 0V Figure 9. Driver Enable and Disable Times (tPZH, tPSH, tPHZ) VCC S1 0V OR 3V 3V RL = 110Ω IN 1.5V 1.5V 0V OUT D tPSL GENERATOR (NOTE 4) CL = 50pF (NOTE 5) 50Ω tPLZ VCC OUT VOM 0.25V VOL Figure 10. Driver Enable and Disable Times (tPZL, tPSL, tPLZ) www.maximintegrated.com Maxim Integrated │  11 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E VID GENERATOR (NOTE 4) 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 3.0V OUT R IN 50Ω CL = 15pF (NOTE 5) 1.5V 1.5V 0V tRPLH tRPHL VCC 1.5V VOM = 0V VOM OUT VCC 2 VOM 0V Figure 11. Receiver Propagation Delay S1 S3 1.5V -1.5V VID GENERATOR (NOTE 4) R 50Ω 1.5V 0V tPRZH tPRSH OUT S2 CL (NOTE 5) 3V IN VCC 1k S1 OPEN S2 CLOSED S3 = 1.5V 3V IN 1.5V 0V tPRZL tPRSL VOH OUT 1.5V IN 1.5V 0V VCC 1.5V 0V 3V S1 CLOSED S2 OPEN S3 = -1.5V VOL S1 OPEN S2 CLOSED S3 = 1.5V 3V IN 1.5V 0V S1 CLOSED S2 OPEN S3 = -1.5V tPRHZ OUT 0.25V tPRLZ VOH OUT 0V VCC 0.25V VOL Figure 12. Receiver Enable and Disable Times Note 4: The input pulse is supplied by a generator with the following characteristics: f = 250kHz, 50% duty cycle, tr ≤ 6.0ns, ZO = 50Ω. Note 5: CL includes probe and stray capacitance. www.maximintegrated.com Maxim Integrated │  12 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Function Tables Applications Information Devices with Receiver/Driver Enable (MAX3483E/MAX3485E/MAX3486E/MAX3491E) Table 1. Transmitting RE INPUTS OUTPUTS MODE DE DI B* A* X 1 1 0 1 Normal X 1 0 1 0 Normal 0 0 X High-Z High-Z Normal 1 0 X High-Z High-Z Shutdown * B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491E). X = Don’t care; High-Z = High impedance Table 2. Receiving INPUTS OUTPUTS MODE RE DE A, B RO 0 0* ≥ +0.2V 1 Normal 0 0* ≤ -0.2V 0 Normal 0 0* Inputs Open 1 Normal 1 0 X High-Z Shutdown * DE is a “don’t care” (x) for the full-duplex part (MAX3491E). X = Don’t care; High-Z = High impedance Devices without Receiver/Driver Enable (MAX3488E/MAX3490E) Table 3. Transmitting INPUT Table 4. Receiving INPUTS OUTPUT DI Z OUTPUTS Y A, B RO 1 0 1 ≥ +0.2V 1 0 1 0 ≤ -0.2V 0 Inputs Open 1 The MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E are low-power transceivers for RS-485 and RS-422 communications. The MAX3483E and MAX3488E can transmit and receive at data rates up to 250kbps, the MAX3486E at up to 2.5Mbps, and the MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The MAX3488E/MAX3490E/MAX3491E are full-duplex transceivers, while the MAX3483E/MAX3485E/MAX3486E are half-duplex. Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX3483E/MAX3485E/ MAX3486E/MAX3491E. When disabled, the driver and receiver outputs are high impedance. Reduced EMI and Reflections (MAX3483E/MAX3486E/MAX3488E) The MAX3483E/MAX3488E are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 13 shows the driver output waveform of a MAX3485E/MAX3490E/MAX3491E transmitting a 125kHz signal, as well as the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same information, but for the slew-rate-limited MAX3483E/ MAX3488E transmitting the same signal. The high-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced. Low-Power Shutdown Mode (MAX3483E/MAX3485E/MAX3486E/MAX3491E) A low-power shutdown mode is initiated by bringing both RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled (high impedance). In shutdown, the devices typically draw only 2nA of supply current. For these devices, the tPSH and tPSL enable times assume the part was in the low-power shutdown mode; the tPZH and tPZL enable times assume the receiver or driver was disabled, but the part was not shut down. 10dB/div 10dB/div 0 500kHz/div 5MHz Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/ MAX3490E/MAX3491E Transmitting a 125kHz Signal www.maximintegrated.com 0 500kHz/div 5MHz Figure 14. Driver Output Waveform and FFT Plot of MAX3483E/ MAX3488E Transmitting a 125kHz Signal Maxim Integrated │  13 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers B 1V/div DI 2V/div A 1V/div Z 1V/div RO 2V/div Y 1V/div 20ns/div 20ns/div Figure 15. MAX3485E/MAX3490E/MAX3491E Driver Propagation Delay Figure 16. MAX3485E/MAX3490E/MAX3491E Receiver Propagation Delay Driven by External RS-485 Device B 1V/div DI 2V/div A 1V/div Z 1V/div Y 1V/div RO 2V/div 1µs/div 1µs/div Figure 17. MAX3483E/MAX3488E Driver Propagation Delay Figure 18. MAX3483E/MAX3488E Receiver Propagation Delay DI 5V/div DI 5V/div VY - VZ 2V/div VY - VZ 2V/div RO 5V/div RO 5V/div 2µs/div Figure 19. MAX3483E/MAX3488E System Differential Voltage at 125kHz Driving 4000 Feet of Cable www.maximintegrated.com 2µs/div Figure 20. MAX3485E/MAX3490E/MAX3491E System Differential Voltage at 125kHz Driving 4000 Feet of Cable Maxim Integrated │  14 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Driver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shutdown circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively. Propagation Delay Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle). The receiver skew time, |tPRLH - tPRHL|, is under 10ns 20ns for the MAX3483E/MAX3488E). The driver skew times are 8ns for the MAX3485E/MAX3490E/MAX3491E, 12ns for the MAX3486E, and typically under 50ns for the MAX3483E/MAX3488E. Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 21 for an example of a line repeater. Figures 19 and 20 show the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120Ω loads. For faster data rate transmission, please consult the factory. A RO RE R B DATA IN DE DI Z D Y 120Ω DATA OUT NOTE: RE AND DE ON MAX3491 ONLY. Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491E www.maximintegrated.com As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3483E family of devices have extra protection against static electricity. Maxim’s engineers have developed state-ofthe-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup or damage. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) ±15kV using the Human Body Model 2) ±8kV using the Contact-Discharge method specified in IEC 1000-4-2 3) ±15kV using IEC 1000-4-2’s Air-Gap method. 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 Figure 22a shows the Human Body Model and Figure 22b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. IEC 1000-4-2 MAX3488E MAX3490E MAX3491E 120Ω ±15kV ESD Protection The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3483E family of devices helps you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 23a shows the IEC 1000-4-2 model, and Figure 23b shows the current waveform for the ±8kV IEC 1000-4-2, Level 4 ESD contact-discharge test. test. Maxim Integrated │  15 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E RC 1M CHARGE-CURRENTLIMIT RESI STOR HIGHVOLTAGE DC SOURCE CS 10 0pF 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers RD 37 22² IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES DEVICE UNDER TEST 36.8% 10% 0 0 TIME tRL tDL CURRENT WAVEFORM Figure 22a. Human Body ESD Test Model Figure 22b. Human Body Current Waveform I RC 50 M TO 100 M CHARGE-CURRENTLIMIT RESI STOR HIGHVOLTAGE DC SOURCE CS 15 0pF RD 55 2² 10 0% 90 % DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST 10 % tR = 0.7ns TO 1ns t 30 ns 60 ns Figure 23a. IEC 1000-4-2 ESD Test Model Figure 23b. IEC 1000-4-2 ESD Generator Current Waveform The air-gap test involves approaching the device with a charged probe. The contact-discharge method connects the probe to the device before the probe is energized. Typical Applications Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection, not just RS-485 inputs and outputs. www.maximintegrated.com The MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 24 and 25 show typical network applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 21. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3483E/MAX3488E and the partially slew-rate-limited MAX3486E are more tolerant of imperfect termination. Maxim Integrated │  16 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 120Ω 120Ω B DI DE B D D DE B A A B A A R R RO RE DI RO RE R R D D MAX3483E MAX3485E MAX3486E DE DI RO RE DI RO RE DE Figure 24. MAX3483E/MAX3485E/MAX3486E Typical RS-485 Network A R RO RE DE DI Y 120Ω 120Ω D B Z Z B D Y 120Ω 120Ω Z Y B A Y Z R A DE RERO DE RE RO R A R MAX3488E MAX3490E MAX3491E D D DI B DI DI DE RERO NOTE: RE AND DE ON MAX3491 ONLY. Figure 25. MAX3488E/MAX3490E/MAX3491E Full-Duplex RS-485 Network www.maximintegrated.com Maxim Integrated │  17 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Ordering Information (continued) PART TEMP. RANGE MAX3485ECSA 0°C to+70°C 8 SO MAX3485ECPA 0°C to+70°C 8 Plastic DIP MAX3485EESA -40°C to+85°C 8 SO MAX3485EEPA -40°C to+85°C 8 Plastic DIP MAX3486ECSA 0°C to +70°C 8 SO MAX3486ECPA 0°C to +70°C 8 Plastic DIP MAX3486EESA -40°C to +85°C 8 SO MAX3486EEPA -40°C to +85°C 8 Plastic DIP MAX3488ECSA 0°C to +70°C 8 SO MAX3488ECPA 0°C to +70°C 8 Plastic DIP MAX3488EESA -40°C to +85°C 8 SO MAX3488EEPA -40°C to +85°C 8 Plastic DIP MAX3490ECSA 0°C to +70°C 8 SO MAX3490ECPA 0°C to +70°C 8 Plastic DIP MAX3490EESA -40°C to +85°C 8 SO MAX3490EEPA -40°C to +85°C 8 Plastic DIP MAX3491ECSD 0°C to +70°C 14 SO MAX3491ECPD 0°C to +70°C 14 Plastic DIP MAX3491EESD -40°C to +85°C 14 SO MAX3491EEPD -40°C to +85°C 14 Plastic DIP www.maximintegrated.com PIN-PACKAGE Chip Information TRANSISTOR COUNT: 761 Maxim Integrated │  18 MAX3483E/MAX3485E/ MAX3486E/MAX3488E/ MAX3490E/MAX3491E 3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 4/99 Initial release — 1 5/19 Updated Absolute Maximum Ratings and Package Information section 2 DESCRIPTION For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. 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. ©  2019 Maxim Integrated Products, Inc. │  19