MAX1488

19-2403; Rev 0; 8/95 ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver _______________General Description The MAX1488E quad, low-power line driver is designed for EIA/TIA-232, EIA/TIA-562, and CCITT V.28 communications in harsh environments. Each transmitter output is protected against ±15kV electrostatic discharge (ESD) shocks. The inputs are TTL and CMOS compatible with minimal loading. The outputs feature internally controlled slew-rate limiting and current limiting. This device has a guaranteed 120kbps data rate. Powersupply current is less than 180µA over a ±4.5V to ±13.2V supply voltage range. The MAX1488E is pin compatible with the MC1488, MC14C88, SN75188, SN75C188, DS1488, and DS14C88. It is available in 14-pin plastic DIP and SO packages. ____________________________Features o ESD Protection: ±15kV—Human Body Model ±6kV—IEC801-2, Contact Discharge ±15kV—IEC801-2, Air-Gap Discharge o Latchup Free, Even During an ESD Event o Low 85µA Supply Current from IEE or ICC o Guaranteed 120kbps Data Rate o No External Capacitors Required for Slew-Rate Limiting o Pin Compatible with MC1488, MC14C88, SN75188, SN75C188, DS1488, and DS14C88 MAX1488E ________________________Applications PC Motherboards Modems Interface Data Terminal Equipment (DTE) with Data Circuit-Terminating Equipment (DCE) Equipment Meeting IEC1000-4-2 (formerly IEC801-2) or ±15kV ESD Protection ______________Ordering Information PART MAX1488ECPD MAX1488ECSD MAX1488EC/D MAX1488EEPD TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE 14 Plastic DIP 14 SO Dice* 14 Plastic DIP 14 SO MAX1488EESD -40°C to +85°C * Dice are specified at TA = +25°C. __________Typical Operating Circuit __________________Pin Configuration 1⁄4 MAX1488E 1⁄4 MAX1489E TOP VIEW VEE 1 TTL/CMOS LOGIC INTERCONNECTING CABLE TTL/CMOS LOGIC INPUT A 2 OUTPUT A 3 INPUT B1 4 14 VCC MAX1488E 13 INPUT D1 12 INPUT D2 11 OUTPUT D 10 INPUT C1 9 8 INPUT C2 OUTPUT C 1⁄4 MAX1489E SIGNAL GROUND 1⁄4 MAX1488E INPUT B2 5 OUTPUT B 6 GND 7 PC MOTHERBOARD (DTE) MODEM (DCE) DIP/SO ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E ABSOLUTE MAXIMUM RATINGS Positive Supply Voltage (VCC) .............................................+14V Negative Supply Voltage (VEE) .............................................-14V Input Voltage (VIN) .................................................-0.3V to +15V Driver Output Voltage ..........................................................±15V Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 10.00mW/°C above +70°C) ..........800mW SO (derate 8.7mW/°C above +70°C) ...........................695mW Operating Temperature Ranges MAX1488EC_D ...................................................0°C to +70°C MAX1488EE_D ................................................-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 13.2V, VEE = -4.5V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC CHARACTERISTICS VCC = -VEE = 5.0V, RL = 3kΩ VCC = -VEE = 6.5V, RL = 3kΩ VCC = -VEE = 12.0V, RL = 3kΩ VCC = -VEE = 13.2V, RL = open VCC = -VEE = 5.0V, RL = 3kΩ VCC = -VEE = 6.5V, RL = 3kΩ VCC = -VEE = 12.0V, RL = 3kΩ VCC = -VEE = 13.2V, RL = open 3.7 5 10 4.0 5.4 10.5 -4.5 -5.8 -10.8 -13.2 4.5 -13.2 No load No load Output shorted to ground (Note 1) -180 ±4 2.0 0.8 0 VCC = VEE = 0V IVOI ≤ 2.0V VCC = 4.5V, VEE = -4.5V, CL = 50pF tPLH VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF Output Propagation Delay, High to Low Propagation Delay Skew, VCC = 4.5V, VEE = -4.5V, CL = 50pF tPHL VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF VCC = 4.5V, VEE = -4.5V, CL = 50pF tSK VCC = 9.0V, VEE = -9.0V, CL = 50pF VCC = 12.0V, VEE = -12.0V, CL = 50pF Human Body Model ESD Protection IEC-1000-4-2 (Contact Discharge) IEC-1000-4-2 (Air-Gap Discharge) 2 300 2.4 2.8 3.1 2.1 2.4 2.6 0.25 0.42 0.42 ±15 ±6 ±15 kV µs 3.5 3.9 4.2 4.5 5.1 5.4 µs µs ±2 85 -85 ±20 ±45 13.2 -3.7 -5 -10 13.2 -4.5 180 SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage High VOH V Output Voltage Low VOL VCC VEE ICC IEE IOS VIH VIL IIN1 RO V Operating Voltage Range Positive Supply Current Negative Supply Current Output Short-Circuit Current Input High Voltage Input Low Voltage Input Current Output Resistance V µA µA mA V V µA Ω TIMING CHARACTERISTICS (see Figure 1) Output Propagation Delay, Low to High ItPLH - tPHLI ESD CHARACTERISTICS _______________________________________________________________________________________ ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver ELECTRICAL CHARACTERISTICS (continued) (VCC = 4.5V to 13.2V, VEE = -4.5V to -13.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL tR1 Output Rise Time tR2 tF1 Output Fall Time tF2 CONDITIONS CL = 1500pF, RL = 5kΩ, VOUTPUT_ from -3.3V to 3.3V CL = 1500pF, RL = 5kΩ, VOUTPUT_ from -3.0V to 3.0V CL = 1500pF, RL = 5kΩ, VOUTPUT_ from -3.3V to 3.3V CL = 1500pF, RL = 5kΩ, VOUTPUT_ from -3.0V to 3.0V CL = 15pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = 12V, VEE = -12V, TA = +25°C, VOUTPUT_ from -3.0V to 3.0V CL = 15pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = 12V, VEE = -12V, TA = +25°C 4 MIN TYP 850 ns 740 860 ns 765 MAX UNITS MAX1488E Output Slew Rate SR 30 V/µs Guaranteed Data Rate 120 kbps Note 1: The IOS value is for one output at a time. If more than one output is shorted simultaneously, damage may occur. __________________________________________Typical Operating Characteristics (VCC = 12V, VEE = -12V, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. SUPPLY VOLTAGE MAX1488E TOC-1 SLEW RATE vs. LOAD CAPACITANCE MAX1488E TOC-2 OUTPUT VOLTAGE vs. TEMPERATURE VOH @ VCC = -VEE = 12V 10 OUTPUT VOLTAGE (V) 5 0 VOL @ VCC = -VEE = 4.5V -5 -10 -15 VOL @ VCC = -VEE = 12V RL= 3kΩ -40 -20 0 20 40 60 80 100 VOH @ VCC = -VEE = 4.5V MAX1488E TOC-3 15 RL= 5kΩ 10 OUTPUT VOLTAGE (V) VOH 5 0 -5 VOL -10 -15 4 5 6 7 8 RL= 3kΩ RL= 5kΩ RL= 3kΩ 11 RL= 3kΩ 10 SLEW RATE (V/µs) 9 8 7 FALLING EDGE 6 5 4 3 0 500 1000 1500 2000 RISING EDGE 15 9 10 11 12 13 14 2500 3000 VCC AND -VEE SUPPLIES (V) LOAD CAPACITANCE (pF) TEMPERATURE (°C) _______________________________________________________________________________________ 3 ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E _____________________Pin Description PIN 1 2, 4, 5, 9, 10, 12, 13 3, 6, 8, 11 7 14 NAME VEE INPUT_ OUTPUT_ GND VCC FUNCTION -4.5V to -13.2V Supply Voltage Input Driver Inputs Driver Outputs Ground +4.5V to +13.2V Supply Voltage Input tF2 tF1 3.3V 3.0V VOUT -3.0V -3.3V 0V DRIVER INPUT 0V 3.0V 1.5V TPHL TPLH VOH _______________Detailed Description The MAX1488E provides ±15kV of ESD protection when operating or when powered down. After an ESD event, the MAX1488E will not latch up. Internal slew-rate-limiting circuitry eliminates the need for external capacitors. The MAX1488E has a guaranteed 120kbps data rate. tR2 VOL tR1 Outputs Tables 1 and 2 describe the output states. The output voltage level is affected by both the load current and supply voltage, and is stable over temperature. Refer to the Typical Operating Characteristics to see how the output voltage varies with supply voltage, load capacitance, and temperature. SIGNAL GENERATOR RL CL Figure 1. Slew-Rate Test Circuit and Timing Diagram Table 1. Driver A Functions INPUT A H L OUTPUTA L H Table 2. Driver B–D Functions INPUT_1 H L INPUT_2 H X OUTPUT_ L H X L H operation. Maxim’s engineers developed state-of-theart structures to protect these pins against ESD of ±15kV, without damage. After an ESD event, the MAX1488E keeps working without latchup. ESD protection can be tested in various ways; the transmitter outputs are characterized for protection to the following: 1) ±15kV using the Human Body Model 2) ±6kV 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). Inputs The driver inputs determine the driver output states (Tables 1 and 2). Driver inputs B, C, and D have two inputs. Connect unused inputs to ground or VCC. ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. 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 test device through a 1.5kΩ resistor. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX1488E driver outputs have extra protection against static electricity found in normal 4 _______________________________________________________________________________________ ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE R D 1 500 Ω DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE R C 5 0M to 100M CHARGE-CURRENT LIMIT RESISTOR R D 3 30 Ω DISCHARGE RESISTANCE DEVICE UNDER TEST Cs 100pF STORAGE CAPACITOR Cs 150pF STORAGE CAPACITOR Figure 2a. Human Body ESD Test Model Figure 3a. IEC1000-4-2 ESD Test Model IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) I PEAK I 100% 90% 10% tDL CURRENT WAVEFORM t r = 0.7ns to 1ns 30ns 60ns t Figure 2b. Human Body Model Current Waveform Figure 3b. IEC1000-4-2 ESD Generator Current Waveform 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 MAX1488E helps you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, without additional ESD-protection components. The major 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 3a), the ESD withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 3b shows the current waveform for the ±6kV IEC1000-4-2 Level 4 ESD Contact-Discharge test. 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. Machine Model The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. Its objective is to mimic the stress caused by contact that occurs with handling and assembly during manufacturing. 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 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 the ground, so it is important to minimize the ground-lead return path to the power supply. A separate return path to the power supply is recommended. Trace widths should be greater than 40 mils. VCC and VEE must be bypassed with 0.1µF capacitors as close to the part as possible to ensure maximum ESD protection. _______________________________________________________________________________________ 5 ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E ___________________Chip Topography V SS V DD INPUT D1 INPUT A INPUT D2 0.134" (3.40mm) OUTPUT A OUTPUT D INPUT B1 INPUT B2 INPUT C1 INPUT C2 OUTPUT B OUTPUT C GND 0.070" (1.78mm) TRANSISTOR COUNT: 95 SUBSTRATE CONNECTED TO GND 6 _______________________________________________________________________________________ ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver ________________________________________________________Package Information DIM INCHES MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.157 0.150 0.050 0.244 0.228 0.050 0.016 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 3.80 4.00 1.27 5.80 6.20 0.40 1.27 MAX1488E D A e B 0.101mm 0.004in. 0°-8° A1 C L A A1 B C E e H L E H Narrow SO SMALL-OUTLINE PACKAGE (0.150 in.) DIM PINS D D D 8 14 16 INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.197 4.80 5.00 0.337 0.344 8.55 8.75 0.386 0.394 9.80 10.00 21-0041A _______________________________________________________________________________________ 7 ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Driver MAX1488E ___________________________________________Package Information (continued) E D A3 A A2 E1 DIM A A1 A2 A3 B B1 C D1 E E1 e eA eB L INCHES MAX MIN 0.200 – – 0.015 0.175 0.125 0.080 0.055 0.022 0.016 0.065 0.045 0.012 0.008 0.080 0.005 0.325 0.300 0.310 0.240 – 0.100 – 0.300 0.400 – 0.150 0.115 INCHES MIN MAX 0.348 0.390 0.735 0.765 0.745 0.765 0.885 0.915 1.015 1.045 1.14 1.265 MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 4.45 1.40 2.03 0.41 0.56 1.14 1.65 0.20 0.30 0.13 2.03 7.62 8.26 6.10 7.87 2.54 – 7.62 – – 10.16 2.92 3.81 MILLIMETERS MIN MAX 8.84 9.91 18.67 19.43 18.92 19.43 22.48 23.24 25.78 26.54 28.96 32.13 21-0043A L A1 e B D1 0° - 15° C B1 eA eB Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.) PKG. DIM PINS P P P P P N D D D D D D 8 14 16 18 20 24 Maxim 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 © 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.