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19-1186; Rev 1; 10/98
15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
_______________General Description
The MAX3187 complete, dual DTE RS-232 serial port meets 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 MAX3187's six RS-232 transmitters and ten RS-232 receivers require no charge pump. Guaranteed to run at data rates up to 230kbps, the MAX3187 is optimized for desktop PC and motherboard applications, and is compatible with popular software for PC communications. Power-supply current is less than 1mA for I DD and ISS, and less than 3mA for ICC. The MAX3187 is available in a space-saving 36-pin SSOP package.
____________________________Features
o Enhanced ESD Protection: 15kV--Human Body Model 8kV--IEC 1000-4-2, Contact Discharge 15kV--IEC 1000-4-2, Air-Gap Discharge o Latchup Free During an ESD Event o 36-Pin SSOP Package o Guaranteed 230kbps Data Rate o Flow-Through Pinout o Two Complete DTE Serial Ports o 6 RS-232 Drivers and 10 RS-232 Receivers
MAX3187
______________Ordering Information
PART MAX3187CAX MAX3187EAX TEMP. RANGE 0C to +70C -40C to +85C PIN-PACKAGE 36 SSOP 36 SSOP
________________________Applications
Desktop PC Motherboards Instruments Equipment Meeting IEC 1000-4-2
Typical Operating Circuit appears at end of data sheet.
____________________________________________________________Pin Configuration
R1OUT R2OUT R3OUT T1IN T2IN R4OUT T3IN R5OUT VCC 1 2 3 4 5 6 7 8 9 36 R1IN 35 R2IN 34 R3IN 33 T1OUT
TOP VIEW
MAX3187
32 T2OUT 31 R4IN 30 T3OUT 29 R5IN 28 VDD 27 GND 26 R6IN 25 R7IN 24 R8IN 23 T4OUT 22 T5OUT 21 R9IN 20 T6OUT 19 R10IN
VSS 10 R6OUT 11 R7OUT 12 R8OUT 13 T4IN 14 T5IN 15 R90UT 16 T6IN 17 R10OUT 18
SSOP
________________________________________________________________ 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.
15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +7V VDD .........................................................................-0.3V to +14V VSS......................................................................... +0.3V to -14V Input Voltages T_IN ......................................................................-0.3V to +6V R_IN .................................................................................30V Output Voltages T_OUT..............................................................................15V R_OUT ....................................................-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT (one at a time) ............................................Continuous R_OUT (one at a time)............................................Continuous Continuous Power Dissipation (TA = +70C) SSOP (derate 11.76mW/C above +70C) ..................762mW Operating Temperature Ranges MAX3187CAX .....................................................0C to +70C MAX3187EAX ..................................................-40C to +85C Storage Temperature Range ............................-65C to +160C Lead Temperature (soldering, 10sec) ............................+300C
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 = +25C.) PARAMETER DC CHARACTERISTICS VCC Operating Voltage Range VDD VSS ICC Supply Current LOGIC Input Logic Threshold Low Input Logic Threshold High Input Leakage Current Output Voltage Low Output Voltage High TRANSMITTER OUTPUTS Output Voltage Swing Transmitter Output Resistance RS-232 Output Short-Circuit Current RECEIVER INPUTS Receiver Input Voltage Range RS-232 Input Threshold Low RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance Receiver Output Short-Circuit Current 3 0.65 5 10 7 -25 0.75 2.4 25 V V V V k mA VDD = 7.0V, VSS = -7.0V, RL = 3k VDD = 12V, VSS = -12V, RL = 3k VCC = VDD = VSS = 0, VT_OUT = 2V 5.0 9.5 300 35 60 V mA VOLR VOHR R_OUT; ISINK = 3.2mA R_OUT; ISOURCE = 1mA VCC - 0.6 VILT VIHT T_IN T_IN 2.0 0.01 1 0.4 0.8 V V A V V IDD ISS No load No load No load 4.5 10.8 -13.2 750 370 370 5.5 13.2 -10.8 3000 1000 1000 A V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
ELECTRICAL CHARACTERISTICS (continued)
(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 = +25C.) PARAMETER ESD CHARACTERISTICS Human Body Model ESD Protection TIMING CHARACTERISTICS Transmitter Output Propagation Delay, Low to High Transmitter Output Propagation Delay, High to Low Transmitter Propagation Delay Skew, | tPLHT - tPHLT | tPLHT tPHLT tSKT VDD = 12V, VSS = -12V, RL = 3k, CL = 1000pF, TA = +25C VDD = 12V, VSS = -12V, RL = 3k, CL = 1000pF, TA = +25C VDD = 12V, VSS = -12V, RL = 3k, CL = 1000pF, TA = +25C VDD = 12V, VSS = -12V, RL = 3k to 7k, measured from +3V to -3V or -3V to +3V, Figure 1, TA = +25C CL = 150pF to 2500pF CL = 50pF to 1000pF 4 8 4 4 0.4 30 V/s 30 4.0 4.0 0.4 120 kbps CL = 50pF to 1000pF 230 7.5 V s s s s s s IEC 1000-4-2 (Contact Discharge) IEC 1000-4-2 (Air-Gap Discharge) 15 8 15 kV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3187
Transition Output Slew Rate
SR
Receiver Output Propagation Delay, Low to High Receiver Output Propagation Delay, High to Low Receiver Propagation Delay Skew, | tPLHR - tPHLR |
tPLHR tPHLR tSKR
VCC = 5V, CL = 50pF, TA = +25C VCC = 5V, CL = 50pF, TA = +25C VCC = 5V, CL = 50pF, TA = +25C VCC = 5V, VDD = 12V, VSS = -12V, RL = 3k to 7k, TA = +25C, any two transmitters switching CL = 50pF to 2500pF
Guaranteed Data Rate
DR
Mouse Driveability
T3OUT = -5mA, T1OUT = T2OUT = 5mA
_______________________________________________________________________________________
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15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
__________________________________________Typical Operating Characteristics
(VCC = +5V, VDD = +12V, VSS = -12V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3187/TOC-02
SUPPLY CURRENT vs. LOAD CAPACITANCE
30 SUPPLY CURRENT (mA) 20 10
ICC IDD, 240kbps IDD, 120kbps IDD, 20kbps 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT DATA RATE/16 3k + CLOAD ISS, 120kbps ISS, 240kbps
MAX3187/TOC-01
SLEW RATE vs. LOAD CAPACITANCE
14 12 SLEW RATE (V/s) 10 8 6 4 2 0 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT DATA RATE/16 3k + CLOAD 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) FALL RISE
MAX3187/TOC-03
40
IDD, 240kbps
40
16
30
IDD, 120kbps
SUPPLY CURRENT (mA)
20
IDD, 20kbps
10
ICC
0
ISS, 20kbps
VCC = 5V 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT DATA RATE/16 3k + CLOAD
0 -10 -20 -30 -40
ISS, 20kbps
-10 -20 -30 -40 10.8 11.4
ISS, 120kbps ISS, 240kbps
12.0
12.6
13.2
0
1000
2000
3000
4000
5000
SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
120kbps 240kbps 2 TRANSMITTER, 240kbps 4 TRANSMITTERS, 15kbps 3k + CLOAD 10.0 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 -10.0 -12.5 0 1000 2000 3000 4000 LOAD CAPACITANCE (pF) 5000 120kbps 240kbps
MAX3187/TOC-04
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER
MAX3187/TOC-05
SLEW RATE vs. TEMPERATURE
MAX3187/TOC-06
12.5 TRANSMITTER OUTPUT VOLTAGE (V)
15 TRANSMITTER OUTPUT VOLTAGE (V) 10 VOUT+ 5
T1
25
20 SLEW RATE (V/ms) FALL, 500pF RISE, 500pF 10 RISE, 2000pF
15
0 -5 -10 -15 0 2
VCC
VOUT+
T2
VOUTT3
VOUT-
5 0 4 6 8 10 12 14 16 18 -55 -35 -15 5
FALL, 2000pF
25
45
65
85 105 125
LOAD CURRENT PER TRANSMITTER (mA)
TEMPERATURE (C)
4
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
______________________________________________________________Pin Description
PIN 1, 2, 3, 6, 8, 11, 12, 13, 16, 18 4, 5, 7, 14, 15, 17 9 10 27 28 19, 21, 24, 25, 26, 29, 31, 34, 35, 36 20, 22, 23, 30, 32, 33 NAME R1OUT-R10OUT T1IN-T6IN VCC VSS GND VDD R10IN-R1IN T6OUT-T1OUT FUNCTION Receiver Outputs, swing between GND and VCC Transmitter Inputs Supply-Voltage Input, 4.5V to 5.5V Supply-Voltage Input, -10.8V to -13.2V Ground. Connect system to ground. Supply-Voltage Input, 10.8V to 13.2V Receiver Inputs Transmitter Outputs, swing between VDD and VSS
MAX3187
_______________Detailed Description
3.0V DRIVER INPUT 0V 1.5V tPHL tPLH VOH 3.3V 3.0V VOUT -3.0V -3.3V 0V
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 MAX3187 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 MAX3187 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)
tF2 tF1
tR2 VOL tR1
SIGNAL GENERATOR
RL
CL
ESD Test Conditions
ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results.
Figure 1. Slew-Rate Test Circuit and Timing Diagram
_______________________________________________________________________________________
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15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM
Figure 2a. Human Body ESD Test Model
Figure 2b. Human Body Model Current Waveform
RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
I 100% 90% IPEAK
Cs 150pF
STORAGE CAPACITOR
10% tr = 0.7ns to 1ns 30ns 60ns t
Figure 3a. IEC 1000-4-2 ESD Test Model
Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform
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 1.5k 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 MAX3187
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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. 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.
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
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.
__________Typical Operating Circuit
MAX3187
+5V
+12V
+5V
+12V
0.1F
VCC
VDD
0.1F 0.1F
VCC
VDD
0.1F
MAX3187
T1 T2 TTL/CMOS LOGIC I/O RS-232 T3 INTERCONNECTING R1 CABLE R2 R3 R4 R5 T4 T5 T6 V+ V+ VTX
MAX3186
R1 R2 R3 T1 T2 T3 T4 T5 GND VSS TTL/CMOS LOGIC I/O
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 0.1F capacitors as close to the part as possible to ensure maximum ESD protection. Connect any unused transmitter inputs to GND or VCC. The MAX3187 is not sensitive to power-supply sequencing, and therefore requires no external protection diodes.
-12V
0.1F
___________________Chip Information
TRANSISTOR COUNT: 419
R6 R7 R8 R9 R10 GND VSS
MOUSE
-12V
0.1F
_______________________________________________________________________________________
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15kV ESD-Protected, EMC-Compliant, 230kbps, Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
________________________________________________________Package Information
SSOP.EPS
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 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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