19-1471; Rev 1; 9/99 ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops Ordering Information PART TEMP. RANGE PIN-PACKAGE Features ♦ Two Complete Serial Ports in a Single 38-Pin TSSOP Package ♦ Requires Only +12V Supply and Logic Supply (+3V to +5.5V) ♦ No Negative Supply Required ♦ One Receiver Active per Port in Standby for System Wake-Up ♦ 460kbps Data Rate; LapLink Compatible ♦ Enhanced ESD Protection ±15kV—Human Body Model ±8kV—IEC 1000-4-2, Contact Discharge ±15kV—IEC 1000-4-2, Air-Gap Discharge ♦ Low 50µA Standby Current ♦ Operates with Either +3V or +5V Logic ♦ Guaranteed Mouse Driveability ♦ Small 0.1µF Capacitors ♦ Flow-Through Pinout Pin Configuration TOP VIEW R5OUT 1 38 R5IN R4OUT 2 37 R4IN R3OUT 3 36 R3IN R2OUT 4 35 R2IN R1OUT 5 34 R1IN MAX3209E 33 T3OUT MAX3209ECUU 0°C to +70°C 38 TSSOP T3IN 6 MAX3209EEUU -40°C to +85°C 38 TSSOP T2IN 7 32 T2OUT T1IN 8 31 T1OUT VSTBY 9 30 V- ________________________Applications Desktop PCs Motherboards Instruments Equipment Requiring IEC 1000-4-2 Compliance VDD 10 29 C1- C1+ 11 28 GND T4IN 12 27 T4OUT T5IN 13 26 T5OUT T6IN 14 25 T6OUT Telecommunications R6OUT 15 24 R6IN Network Servers R7OUT 16 23 R7IN Typical Operating Circuit appears at end of data sheet. R8OUT 17 22 R8IN R9OUT 18 21 R9IN R10OUT 19 LapLink is a trademark of Traveling Software. 20 R10IN TSSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3209E General Description The MAX3209E is a complete, dual DTE RS-232 serial port (6 transmitters, 10 receivers) for motherboards and desktop PCs that ensures compliance with the stringent ESD requirements of the European Community. The device minimizes board space and power consumption by eliminating the need for a negative power supply; it integrates two serial ports and a charge pump into a single 38-pin TSSOP package. The MAX3209E features a 50µA low-power standby mode for compliance with system power-management requirements. During standby, while the device operates from the single +3V to +5.5V logic supply, one receiver on each port remains active, allowing automatic system wake-up when peripheral communications resume. 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, making the device ideal for use in harsh environments or mission-critical equipment. As a result of its robust charge-pump structure, the MAX3209E guarantees mouse driveability and true RS-232 operation at data rates up to 460kbps, ensuring compatibility with PC-to-PC communication software (such as LapLink™). MAX3209E ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops ABSOLUTE MAXIMUM RATINGS VDD .........................................................................-0.3V to +15V VSTBY ....................................................................... -0.3V to +7V V- ........................................................................... +0.3V to -15V Input Voltages T_IN ......................................................................-0.3V to +7V R_IN .................................................................................±30V Output Voltages T_OUT..............................................................................±15V R_OUT.................................................-0.3V to (VSTBY + 0.3V) Short-Circuit Duration T_OUT (one at a time) ............................................Continuous R_OUT (one at a time)............................................Continuous Continuous Power Dissipation (TA = +70°C) TSSOP (derate 11.8mW/°C above +70°C) ..................941mW Operating Temperature Ranges MAX3209EC_ _ ...................................................0°C to +70°C MAX3209EE_ _ ................................................-40°C to +85°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. ELECTRICAL CHARACTERISTICS (VDD = +10.8V to +13.2V, VSTBY = +3V to +5.5V, C1 = C2 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, VDD = +12V, VSTBY = +3.3V.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Operating Voltage Range VDD 10.8 13.2 STBY 3 5.5 V VDD = +12V, no load, all transmitter inputs at VSTBY, all receiver inputs at VSTBY or unconnected 0.5 1 mA ISTBY VDD = 0, VSTBY = +3.3V, no load, all transmitter inputs at VSTBY, all receiver inputs at VSTBY or unconnected 50 100 µA Input Logic Threshold Low VILT T_IN 0.8 V Input Logic Threshold High VIHT T_IN 25 µA 0.4 V IDD Supply Current TRANSMITTER LOGIC INPUTS Input Pull-Up Current 2 V Transmitter input at GND RECEIVER LOGIC OUTPUTS Output Voltage Low Output Voltage High Receiver Output Leakage Current VOLR VOHR R_OUT; ISINK = 1.6mA R_OUT ISOURCE = 40µA VSTBY - 0.3 ISOURCE = 1mA VSTBY - 0.6 VDD = 0, VSTBY = 5V V 0.05 ±5 µA RS-232 TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND RS-232 Output Short-Circuit Current VT_OUT = 0 Transmitter Output Resistance VDD = VSTBY = 0, VOUT = ±2V ±5.0 V ±10 ±60 mA Ω 300 RS-232 RECEIVER INPUTS Receiver Input Voltage Range -25 RS-232 Input Threshold Low TA = +25°C RS-232 Input Threshold High TA = +25°C 2.4 RS-232 Input Hysteresis VSTBY = 3.3V 0.2 RS-232 Input Resistance TA = +25°C 2 3 25 V 0.4 V V 5 _______________________________________________________________________________________ 1 V 7 kΩ ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops (VDD = +10.8V to +13.2V, VSTBY = +3V to +5.5V, C1 = C2 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, VDD = +12V, VSTBY = +3.3V.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ESD CHARACTERISTICS ESD Protection Human Body Model ±15 IEC 1000-4-2 (Contact Discharge) ±8 IEC 1000-4-2 (Air-Gap Discharge) ±15 kV TRANSMITTER TIMING CHARACTERISTICS (Figure 1) Guaranteed Data Rate DR RL = 3kΩ to 7kΩ, CL = 50pF to 1000pF, two transmitters switching 460 T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ to GND, T1OUT and T2OUT loaded with 2.5mA each Mouse Driveability kbps +6 -5 V Transmitter Output Propagation Delay, Low to High tPLHT CL = 1000pF 1 µs Transmitter Output Propagation Delay, High to Low tPHLT CL = 1000pF 1 µs Transmitter Output Slew Rate SR RL = 3kΩ to 7kΩ, VSTBY = 3.3V, CL = 50pF to 1000pF, TA = +25°C, measured from +3V to -3V or -3V to +3V 6 12 30 V/µs RECEIVER TIMING CHARACTERISTICS Receiver Output Propagation Delay, Low to High tPLHR CL = 150pF 0.4 1 µs Receiver Output Propagation Delay, High to Low tPHLR CL = 150pF 0.4 1 µs Typical Operating Characteristics (VSTBY = +5V, VDD = +12V, C1 = C2 = 0.1µF, TA = +25°C, unless otherwise noted.) 460kbps 25 240kbps 20 120kbps 15 C1 = C2 = 0.1µF 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE ALL TRANSMITTERS AT 3kΩ + 1000pF 5 10.8 11.4 12.0 12.6 SUPPLY VOLTAGE (V) 460kbps 240kbps 25 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 30 10 30 MAX3209E-01 35 20 120kbps 15 10 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3kΩ + CL 5 13.2 MAX3209E-02 SUPPLY CURRENT vs. LOAD CAPACITANCE SUPPLY CURRENT vs. SUPPLY VOLTAGE 0 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) _______________________________________________________________________________________ 3 MAX3209E ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VSTBY = +5V, VDD = +12V, C1 = C2 = 0.1µF, TA = +25°C, unless otherwise noted.) RECEIVER OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT RECEIVER OUTPUT LOW VOLTAGE vs. SINK CURRENT RECEIVER OUTPUT HIGH VOLTAGE (V) 0.5 0.4 0.3 0.2 0.1 MAX3209E-04 5.0 MAX3209E-03 0.6 RECEIVER OUTPUT LOW VOLTAGE (V) MAX3209E ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 3 4 5 6 7 8 0 9 0 5 ISINK (mA) 10 15 20 25 30 ISOURCE (mA) Pin Description 3.0V PIN NAME 1–5, 15–19 R_OUT TTL/CMOS Receiver Outputs 6, 7, 8, 12, 13, 14 T_IN TTL/CMOS Transmitter Inputs 9 VSTBY 10 VDD +12V Single-Supply Voltage 11 C1+ Positive Terminal of the Inverting Charge-Pump Capacitor 20–24, 34–38 R_IN RS-232 Receiver Inputs 1.5V tPHL tPLH VOH 25, 26, 27, 31, 32, 33 T_OUT 28 GND 29 C1- 30 V- 4 FUNCTION DRIVER INPUT 0 3.3V 3.0V Standby Power Supply for R5 and R10 VOUT 0V -3.0V -3.3V tF2 tR2 tF1 tR1 VOL RS-232 Transmitter Outputs Ground Negative Terminal of the Inverting Charge-Pump Capacitor -12V generated by the inverting charge pump SIGNAL GENERATOR RL Figure 1. Slew-Rate Test Circuit and Timing Diagram _______________________________________________________________________________________ CL ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges (ESD) encountered during handling and assembly. The MAX3209E 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 ±15kV ESD, without damage. After an ESD event, the MAX3209E continues working without latchup. ESD protection can be tested in several ways. The transmitter outputs and 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 IEC 1000-4-2 (formerly IEC 801-2) 3) ±15kV using the Air-Gap Method specified in IEC 1000-4-2 (formerly IEC 801-2) 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 HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR Figure 2a. Human Body ESD Test Model 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 device through a 1.5kΩ resistor. IEC 1000-4-2 Since January 1996, all equipment manufactured and/or sold in the European community has been required to meet the stringent IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3209E helps you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without additional ESDprotection components. The main 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 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 IEC 1000-4-2 Level 4 ESD Contact-Discharge test. IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 2b. Human Body Model Current Waveform RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 3a. IEC 1000-4-2 ESD Test Model _______________________________________________________________________________________ 5 MAX3209E Detailed Description MAX3209E ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops I 100% 90% POWER-MANAGEMENT UNIT IPEAK +12V VSTBY SUPER I/O 10% tR = 0.7ns to 1ns MAX3209E R5 t 30ns R10 60ns 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 IEC 1000-4-2. Applications Information R5 and R10 Active in Standby Mode The MAX3209E is placed in standby mode when VDD is not present, provided that VSTBY remains at +3V to +5.5V. In standby mode, receivers R5 and R10 remain active, consuming 100µA max while unloaded. Standby mode allows activity to be sensed on the serial ports so that main power can be restored by the power-management unit, as shown in Figure 4. Layout Considerations 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 VDD and VSTBY with 0.1µF capacitors as close to the part as possible to ensure maximum ESD protection. The MAX3209E is not sensitive to power-supply sequencing, and therefore requires no external protection diodes. ALL OTHER RECEIVERS INACTIVE R_ Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform ALL TRANSMITTERS INACTIVE GND T_ Figure 4. MAX3209E in Standby Mode Interconnection with 3V and 5V Logic The MAX3209E can directly interface with various 3V and 5V logic families, including ACT and HCT CMOS. See Table 1 for more information on possible combinations of interconnections. Mouse Driveability The MAX3209E has been specifically designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3209E successfully drove all serial mice tested and met their respective current and voltage requirements. Table 1. Logic Family Compatibility with Various Supply Voltages SYSTEM POWERSUPPLY VOLTAGE (V) VSTBY SUPPLY VOLTAGE (V) 3.3 3.3 5 5 Compatible with all TTL and CMOS families. 3.3 Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS. 5 6 VDD COMPATIBILITY Compatible with all CMOS families. _______________________________________________________________________________________ ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops 0.1µF +5V +12V VSTBY VDD 0.1µF 0.1µF MAX3209E +5V +12V VCC VDD TRANSISTOR COUNT: 774 0.1µF MAX3186 T1 R1 R2 T2 RS-232 TTL/CMOS LOGIC I/O ___________________Chip Information T3 TTL/CMOS LOGIC I/O R3 INTERCONNECTING R1 T1 CABLE R2 T2 R3 T3 R4 T4 R5 T5 V+ T4 V+ T5 GND VSS -12V 0.1µF V- T6 TX R6 MOUSE R7 R8 R9 C1 0.1µF C1+ R10 C1GND V0.1µF C2 _______________________________________________________________________________________ 7 MAX3209E __________Typical Operating Circuit ________________________________________________________Package Information TSSOP, 4.40mm.EPS MAX3209E ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops 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 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.