19-0426; Rev 0; 8/95 ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver ________________________Applications ____________________________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 ♦ Low 350µA Supply Current ♦ Input Hysteresis and Time-Domain Filtering Eliminate the Need for External Filtering ♦ Stable Input Thresholds ♦ Pin Compatible with MC1489, MC14C89, SN75189, SN75C189, DS1489, and DS14C89 PC Motherboards ______________Ordering Information Modems Interfacing Data Terminal Equipment (DTE) with Data Circuit-Terminating Equipment (DCE) Equipment Meeting IEC1000-4-2 (formerly IEC801-2) or ±15kV ESD Protection PART TEMP. RANGE MAX1489ECPD 0°C to +70°C 14 Plastic DIP PIN-PACKAGE MAX1489ECSD MAX1489EC/D MAX1489EEPD MAX1489EESD 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 14 SO Dice* 14 Plastic DIP 14 SO * Dice are specified at TA = +25°C. __________Typical Operating Circuit 1⁄4 MAX1489E 1⁄4 MAX1488E __________________Pin Configuration TOP VIEW INPUT A 1 TTL/CMOS LOGIC INTERCONNECTING CABLE TTL/CMOS LOGIC MAX1489E N.C. 2 13 INPUT D OUTPUT A 3 12 N.C. INPUT B 4 11 OUTPUT D N.C. 5 1⁄4 MAX1488E 1⁄4 MAX1489E SIGNAL GROUND PC MOTHERBOARD (DTE) MODEM (DCE) 14 VCC 10 INPUT C OUTPUT B 6 9 N.C. GND 7 8 OUTPUT C DIP/SO ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 MAX1489E _______________General Description The MAX1489E quad, low-power line receiver is designed for EIA/TIA-232, EIA/TIA-562, and CCITT V.28 communications in harsh environments. Each receiver input is protected against ±15kV electrostatic discharge (ESD) shocks. These inputs have a ±25V range and feature hysteresis and time-domain filtering. The outputs are TTL and CMOS compatible. The MAX1489E has a 120kbps guaranteed data rate. Supply current is typically 350µA. The MAX1489E is pin compatible with the MC1489, MC14C89, SN75189, SN75C189, DS1489, and DS14C89. It is available in 14-pin plastic DIP and SO packages. MAX1489E ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC).............................................................+7V Input Voltage (VIN) ...............................................................±30V Output Short-Circuit Current (Shorted to GND or VCC) (Note 1) ............................Self Limiting 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 MAX1489EC_D ...................................................0°C to +70°C MAX1489EE_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 = 5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP IOUT = -3.2mA 3.5 4.99 IOUT = -20µA 2.5 4.41 MAX UNITS DC CHARACTERISTICS Output Voltage High VOH VIN ≤ 0.4V Output Voltage Low VOL VIN ≥ 2.4V, IOUT = 3.2mA Shorted to GND 0.17 IOS Supply Current ICC Input Voltage Range VIN -25 Input Voltage High VIH 1.60 Input Voltage Low VIL 0.75 VHYST Input Resistance RIN 0.4 -35 Output Short-Circuit Current (Note 1) Input Hysteresis V Shorted to VCC 60 260 mA 600 µA 25 V 2.17 2.60 V 1.06 1.30 V 7.0 kΩ 1.11 3.0 V 5.0 V TIMING CHARACTERISTICS Output Propagation Delay, Low to High tPLH Figure 1 1.38 4.0 µs Output Propagation Delay, High to Low tPHL Figure 1 1.45 4.0 µs tSKEW Figure 1 Output Propagation Delay Skew, ItPLH - tPHLI 70 ns Output Transition Time tTR VOUT = 10% to 90% 35 Input Noise Rejection tN Pulse amplitude = 5V (Note 2) 1.0 µs Guaranteed Data Rate DR 240 kbps 120 120 ns ESD CHARACTERISTICS Human Body Model ESD Protection ±15 IEC1000-4-2 (Contact Discharge) ±8 IEC1000-4-2 (Air-Gap Discharge) ±15 Note 1: Only one output may be shorted at a time. Note 2: See Noise Pulse Rejection graph in Typical Operating Characteristics section. 2 _______________________________________________________________________________________ kV ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver PROPAGATION DELAY SKEW vs. TEMPERATURE tPLH 1.0 INPUT PULSE AMPLITUDE (Vp-p) tPHL 8 MAX1489E-02 MAX1489E-01 1.4 PROPAGATION DELAY SKEW (ns) PROPAGATION DELAY (µs) 1.8 NOISE PULSE REJECTION 800 600 400 VCC = 5.25V 200 VCC = 5V VCC = 4.75V 0.6 0 -40 -15 10 35 60 VIN = (VIL + VIH) ± PULSE AMP, 2 2 f = 300kHz 6 4 2 0 -40 85 MAX1489E-03 PROPAGATION DELAY vs. TEMPERATURE 2.2 TEMPERATURE (°C) -15 10 35 60 85 0.7 1.1 TEMPERATURE (°C) 1.5 1.9 2.3 2.7 INPUT PULSE WIDTH (µs) _____________________Pin Description 3.0V PIN NAME 1, 4, 10, 13 INPUT_ 2, 5, 9, 12 N.C. 3, 6, 8, 11 OUTPUT_ 7 GND FUNCTION Receiver Inputs S.G. 1.5V 0V tPHL tPLH Receiver Outputs VOH 90% No Connect—not internally connected VOUT 50% 50% Ground 10% 14 VCC VOL Supply Voltage tTR tTR VCC 50pF SIGNAL GENERATOR (S.G.) VOUT NOTE: S.G. SET TO f = 20kHz; DUTY CYCLE = 50%; tR, tF < 5.0ns Figure 1. Timing Diagram _______________________________________________________________________________________ 3 MAX1489E __________________________________________Typical Operating Characteristics (VCC = 5V, TA = +25°C, unless otherwise noted.) MAX1489E ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver R C 1M CHARGE-CURRENT LIMIT RESISTOR R D 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 tRL TIME tDL CURRENT WAVEFORM Figure 2a. Human Body ESD Test Model Figure 2b. Human Body Model Current Waveform _______________Detailed Description 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 MAX1489E receiver inputs have extra protection against static electricity found in normal operation. Maxim’s engineers developed state-of-theart structures to protect these pins against ESD of ±15kV without damage. After an ESD event, the MAX1489E keeps working without latchup. ESD protection can be tested in various ways; 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 Discharge method specified in IEC1000-4-2 (formerly IEC801-2). ESD Test Conditions Contact Maxim for a reliability report that documents test setup, methodology, and results. 4 IEC1000-4-2 The IEC100-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX1489E 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 ±8kV 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. _______________________________________________________________________________________ ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver HIGHVOLTAGE DC SOURCE Cs 150pF I 100% 90% R D 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR I PEAK CHARGE-CURRENT LIMIT RESISTOR MAX1489E R C 50M to 100M DEVICE UNDER TEST 10% t r = 0.7ns to 1ns t 30ns 60ns Figure 3a. IEC1000-4-2 ESD Test Model 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. Figure 3b. IEC1000-4-2 ESD Generator Current Waveform __________ 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 through the ground pin, so it is important to minimize the groundlead 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 must be bypassed with 0.1µF capacitors as close to the part as possible to ensure maximum ESD protection. _______________________________________________________________________________________ 5 MAX1489E ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver ___________________Chip Topography V CC INPUT A INPUT D OUTPUT A OUTPUT D INPUT B INPUT C 0.096" (2.438mm) OUTPUT B OUTPUT C GND 0.071" (1.803mm) TRANSISTOR COUNT: 144 SUBSTRATE CONNECTED TO GND 6 _______________________________________________________________________________________ ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver D E DIM E1 A A1 A2 A3 B B1 C D1 E E1 e eA eB L A3 A A2 L A1 0° - 15° C e B1 B eA eB D1 Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.) 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 PKG. DIM PINS P P P P P N D D D D D D 8 14 16 18 20 24 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 _______________________________________________________________________________________ 7 MAX1489E ________________________________________________________Package Information MAX1489E ±15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver ___________________________________________Package Information (continued) DIM D 0°-8° A 0.101mm 0.004in. e B A1 E C L Narrow SO SMALL-OUTLINE PACKAGE (0.150 in.) H A A1 B C E e H L 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 DIM PINS D D D 8 14 16 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 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 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.