19-1076; Rev 0; 9/96 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ________________________Applications Desktop PC Motherboards ____________________________Features ♦ Enhanced ESD Protection: ±15kV—Human Body Model ±8kV—IEC1000-4-2, Contact Discharge ±15kV—IEC1000-4-2, Air-Gap Discharge ♦ Latchup Free During an ESD Event ♦ 20-Pin SSOP and SO Packages ♦ Guaranteed 230kbps Data Rate ♦ Flow-Through Pinout ♦ Pin Compatible with SN75C185 ♦ Complete DTE Serial Port ______________Ordering Information PART TEMP. RANGE MAX3185CWP 0°C to +70°C MAX3185CAP MAX3185EWP MAX3185EAP 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 SO 20 SSOP 20 SO 20 SSOP Instruments Equipment Meeting IEC1000-4-2 __________Typical Operating Circuit MAX3186 MAX3185 T1 R1 T2 TTL/CMOS LOGIC I/O RS-232 R3 INTERCONNECTING T4 R4 CABLE T5 TOP VIEW R2 T3 R5 __________________Pin Configuration TTL/CMOS LOGIC I/O VDD 1 20 VCC R1IN 2 19 R1OUT R2IN 3 18 R2OUT R3IN 4 17 R3OUT 16 T1IN T1OUT 5 15 T2IN T2OUT 6 14 R4OUT R4IN 7 13 T3IN T3OUT 8 R1 T1 12 R5OUT R5IN 9 R2 T2 R3 T3 VSS 10 MAX3185 11 GND SO/SSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX3185 _______________General Description The MAX3185 is a complete DTE RS-232 serial port designed to meet the stringent ESD requirements of the European community. 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. The MAX3185 has three RS-232 transmitters, five RS232 receivers, and no charge pump, optimizing it for operation in desktop PC and motherboard applications. It is guaranteed to run at data rates up to 230kbps, providing compatibility with popular software for communicating with personal computers. Power-supply current is less than 300µA for IDD and ISS, and less than 1mA for ICC. The MAX3185 is pin and functionally compatible with the industry-standard 75185, so existing designs can instantly become EMC compliant. The MAX3185 is available in an SO package and in the tiny SSOP that further reduces board space. MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +7V VDD .........................................................................-0.3V to +14V VSS......................................................................... +0.3V to -14V Input Voltages TIN ........................................................................-0.3V to +6V RIN ...................................................................................±30V Output Voltages TOUT .................................................................................±15V ROUT .......................................................-0.3V to (VCC + 0.3V) Short-Circuit Duration TOUT (one at a time)...............................................Continuous ROUT (one at a time) ..............................................Continuous Continuous Power Dissipation (TA = +70°C) Wide SO (derate 10.00mW/°C above +70°C)..............800mW SSOP (derate 8.00mW/°C above +70°C) ....................640mW Operating Temperature Ranges MAX3185C_ P .....................................................0°C to +70°C MAX3185E_ P ..................................................-40°C to +85°C Storage Temperature Range ............................-65°C to +160°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. ELECTRICAL CHARACTERISTICS (VCC = +4.5V to +5.5V, VDD = +10.8V to +13.2V, VSS = -10.8V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Operating Voltage Range VCC 4.5 5.5 VDD 10.8 13.2 VSS -13.2 -10.8 ICC No load 380 1500 IDD No load 185 500 ISS No load 185 500 Input Logic Threshold Low VILT TIN Input Logic Threshold High VIHT TIN Supply Current V µA LOGIC Input Leakage Current VOLR ROUT; ISINK = 3.2mA Output Voltage High VOHR ROUT; ISOURCE = 1mA V 1 µA 0.4 V V 0.01 Output Voltage Low 0.8 2.0 VCC - 0.6 V TRANSMITTER OUTPUTS Output Voltage Swing Transmitter Output Resistance VDD = 7.0V, VSS = -7.0V, RL = 3kΩ ±5.0 VDD = 12V, VSS = -12V, RL = 3kΩ ±9.5 VCC = VDD = VSS = 0V, VT_OUT = ±2V 300 RS-232 Output Short-Circuit Current V Ω ±35 ±60 mA 25 V RECEIVER INPUTS Receiver Input Voltage Operating Range -25 RS-232 Input Threshold Low 0.75 V RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance Receiver Output Short-Circuit Current 2 2.4 V 7 kΩ 0.65 3 5 ±10 _______________________________________________________________________________________ V mA ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs (VCC = +4.5V to +5.5V, VDD = +10.8V to +13.2V, VSS = -10.8V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ESD CHARACTERISTICS Human Body Model ESD Protection ±15 IEC1000-4-2 (Contact Discharge) ±8 IEC1000-4-2 (Air-Gap Discharge) ±15 kV TIMING CHARACTERISTICS Transmitter Output Propagation Delay, Low to High tPLHT VDD = 12V, VSS = -12V, RL = 3kΩ, CL = 1000pF, TA = +25°C 4 µs Transmitter Output Propagation Delay, High to Low tPHLT VDD = 12V, VSS = -12V, RL = 3kΩ, CL = 1000pF, TA = +25°C 4 µs Transmitter Propagation Delay Skew, | tPLHT - tPHLT | tSKT VDD = 12V, VSS = -12V, RL = 3kΩ, CL = 1000pF, TA = +25°C 0.4 µs SR VDD = 12V, VSS = -12V, RL = 3kΩ to 7kΩ, measured from +3V to -3V or -3V to +3V, Figure 3, TA = +25°C Transition Output Slew Rate CL = 150pF to 2500pF 4 30 CL = 50pF to 1000pF 8 30 V/µs Receiver Output Propagation Delay, Low to High tPLHR VCC = 5V, CL = 50pF, TA = +25°C 4.0 µs Receiver Output Propagation Delay, High to Low tPHLR VCC = 5V, CL = 50pF, TA = +25°C 4.0 µs Receiver Propagation Delay Skew, | tPLHR - tPHLR | tSKR VCC = 5V, CL = 50pF, TA = +25°C 0.4 µs DR VCC = 5V, VDD = 12V, VSS = -12V, RL = 3kΩ to 7kΩ, TA = +25°C Guaranteed Data Rate Mouse Driveability CL = 50pF to 2500pF 120 CL = 50pF to 1000pF 230 kbps T3OUT = -5mA, T1OUT = T2OUT = +5mA ±7.5 V _______________________________________________________________________________________ 3 MAX3185 ELECTRICAL CHARACTERISTICS (continued) __________________________________________Typical Operating Characteristics (VCC = +5.0V, VDD = +12.0V, VSS = -12.0V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. LOAD CAPACITANCE 2 TRANSMITTERS AT DATA RATE / 16 0 3kΩ + 2500pF LOAD ISS, 20kbps ISS, 120kbps ISS, 240kbps -20 10.8 12.5 12.0 12.6 -7.5 120kbps 3kΩ + CL LOAD 0 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 5000 MAX3185-TOC03 FALL 10 RISE 8 6 1 TRANSMITTER 240kbps 2 TRANSMITTERS 15kbps 3kΩ + CL LOAD 4 2 0 0 0 5000 15 10 T1 VOUT+ T2 -5 VCC VOUTVOUT- T3 2000 3000 4000 5000 SLEW RATE vs. TEMPERATURE 25 20 VOUT+ 5 0 1000 LOAD CAPACITANCE (pF) FALL, 500pF 15 RISE, 500pF 10 RISE, 2000pF 5 -10 FALL, 2000pF 0 -15 -12.5 4 ISS, 240kbps MAX3185 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER 240kbps -10.0 ISS, 120kbps -15 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE -2.5 -5.0 -10 SUPPLY VOLTAGE (V) 1 TRANSMITTER AT DATA RATE 2 TRANSMITTERS AT DATA RATE / 16 3kΩ + CL LOAD 0 ISS, 20kbps 2 TRANSMITTERS AT DATA RATE / 16 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 240kbps 2.5 0 -5 13.2 120kbps 5.0 1 TRANSMITTER AT DATA RATE ICC -25 11.4 10.0 7.5 5 -20 TRANSMITTER OUTPUT VOLTAGE (V) -15 12 IDD, 20kbps SLEW RATE (V/µs) -10 10 MAX3185-TOC05 -5 14 IDD, 120kbps MAX3185-TOC06 ICC 16 SLEW RATE (V/µs) 1 TRANSMITTER AT DATA RATE IDD, 240kbps 15 SUPPLY CUREENT (mA) IDD, 20kbps 5 MAX3185-TOC04 SUPPLY CUREENT (mA) IDD, 120kbps 10 20 MAX3185-TOC02 IDD, 240kbps 15 SLEW RATE vs. LOAD CAPACITANCE 25 MAX3185-TOC01 20 TRANSMITTER OUTPUT VOLTAGE (V) MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs 0 2 4 6 8 10 12 14 16 18 LOAD CURRENT PER TRANSMITTER (mA) -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) _______________________________________________________________________________________ ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs PIN NAME FUNCTION 1 VDD 12, 14, 17, 18, 19 R5OUT–R1OUT Supply-Voltage Input, +10.8V to +13.2V Receiver Outputs, swing between GND and VCC 16, 15, 13 T3IN, T2IN, T1IN Transmitter Inputs 10 VSS Supply-Voltage Input, -10.8V to -13.2V 11 GND Ground. Connect system to ground. 2, 3, 4, 7, 9 R1IN–R5IN 5, 6, 8 T1OUT, T2OUT, T3OUT 20 VCC Receiver Inputs Transmitter Outputs, swing between VDD and VSS Supply-Voltage Input, +4.5V to +5.5V _______________Detailed Description RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 150pF ±15kV ESD Protection RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 1a. IEC1000-4-2 ESD Test Model I 100% 90% As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX3185 driver outputs and receiver inputs have extra protection against static electricity found in normal operation. Maxim’s engineers developed state-of-the-art structures to protect these pins against ESD of ±15kV, without damage. After an ESD event, the MAX3185 continues working without latchup. ESD protection can be tested in several ways. The transmitter outputs and the receiver inputs are characterized for protection to the following: 1) ±15kV using the Human Body Model 2) ±8kV using the Contact-Discharge Method specified in IEC1000-4-2 (formerly IEC801-2) 3) ±15kV using the Air-Gap Method specified in IEC1000-4-2 (formerly IEC801-2) ESD Test Conditions IPEAK ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. 10% tr = 0.7ns to 1ns t 30ns 60ns Figure 1b. IEC1000-4-2 ESD-Generator Current Waveform _______________________________________________________________________________________ 5 MAX3185 ______________________________________________________________Pin Description MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs Human Body Model Figure 2a shows the Human Body Model, and Figure 2b 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 device through a 1.5kΩ resistor. IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3185 helps you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, without additional ESD-protection components. The main difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2. Because series resistance is lower in the IEC1000-4-2 ESD test model (Figure 1a), the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 1b shows the current waveform for the ±8kV IEC1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charge probe. The Contact-Discharge method connects the probe to the device before the probe is energized. RC 1M CHARGE-CURRENT LIMIT RESISTOR Machine Model The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. Of course, all pins (not just RS-232 inputs and outputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than are the Human Body Model and IEC1000-4-2. __________Applications Information Use proper layout to ensure other devices on your board are not damaged in an ESD strike. Currents as high as 60A can instantaneously pass into ground, so be sure to minimize the ground-lead return path to the power supply. A separate return path to the power supply is recommend. Trace widths should be greater than 40 mils. Bypass VCC, VDD, and VSS with 0.1µF capacitors as close to the part as possible to ensure maximum ESD protection. Tie any unused transmitter inputs to GND or VCC. No external protection diodes are needed because the MAX3185 is not sensitive to power-supply sequencing. RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 2a. Human Body ESD Test Model 6 tRL TIME tDL CURRENT WAVEFORM Figure 2b. Human Body Model Current Waveform _______________________________________________________________________________________ ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs TRANSISTOR COUNT: 217 3.0V DRIVER INPUT 0V 1.5V TPHL TPLH VOH 3.3V 3.0V VOUT 0V -3.0V -3.3V tF2 tR2 tF1 tR1 VOL SIGNAL GENERATOR RL CL Figure 3. Slew-Rate Test Circuit and Timing Diagram _______________________________________________________________________________________ 7 MAX3185 ___________________Chip Information MAX3185 ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs ________________________________________________________Package Information DIM D 0°- 8° A e B 0.101mm 0.004in. A1 C L A A1 B C E e H L INCHES MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.299 0.291 0.050 0.419 0.394 0.050 0.016 DIM PINS E Wide SO SMALL-OUTLINE PACKAGE (0.300 in.) H D D D D D 16 18 20 24 28 INCHES MIN MAX 0.398 0.413 0.447 0.463 0.496 0.512 0.598 0.614 0.697 0.713 MILLIMETERS MIN MAX 2.35 2.65 0.10 0.30 0.35 0.49 0.23 0.32 7.40 7.60 1.27 10.00 10.65 0.40 1.27 MILLIMETERS MIN MAX 10.10 10.50 11.35 11.75 12.60 13.00 15.20 15.60 17.70 18.10 21-0042A DIM α E H C L A A1 B C D E e H L α INCHES MILLIMETERS MAX MIN MIN MAX 0.078 1.73 0.068 1.99 0.008 0.05 0.002 0.21 0.015 0.25 0.010 0.38 0.008 0.09 0.004 0.20 SEE VARIATIONS 0.209 5.20 0.205 5.38 0.0256 BSC 0.65 BSC 0.311 7.65 0.301 7.90 0.037 0.63 0.025 0.95 8˚ 0˚ 0˚ 8˚ DIM PINS e SSOP SHRINK SMALL-OUTLINE PACKAGE A B A1 D D D D D 14 16 20 24 28 INCHES MILLIMETERS MAX MIN MAX MIN 6.33 0.239 0.249 6.07 6.33 0.239 0.249 6.07 7.33 0.278 0.289 7.07 8.33 0.317 0.328 8.07 0.397 0.407 10.07 10.33 21-0056A D Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.