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19-1076; Rev 0; 9/96
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs
_______________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 300A 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.
____________________________Features
o Enhanced ESD Protection: 15kV--Human Body Model 8kV--IEC1000-4-2, Contact Discharge 15kV--IEC1000-4-2, Air-Gap Discharge o Latchup Free During an ESD Event o 20-Pin SSOP and SO Packages o Guaranteed 230kbps Data Rate o Flow-Through Pinout o Pin Compatible with SN75C185 o Complete DTE Serial Port
MAX3185
______________Ordering Information
PART TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 20 SO 20 SSOP 20 SO 20 SSOP MAX3185CWP MAX3185CAP MAX3185EWP MAX3185EAP
________________________Applications
Desktop PC Motherboards Instruments Equipment Meeting IEC1000-4-2
__________Typical Operating Circuit
MAX3186
T1 T2 TTL/CMOS LOGIC I/O RS-232 T3 INTERCONNECTING T4 CABLE T5 R1 R2 R3 R5 T1 R4 R3
__________________Pin Configuration
TOP VIEW
VDD 1 R1IN 2 20 VCC 19 R1OUT 18 R2OUT 17 R3OUT 16 T1IN 15 T2IN 14 R4OUT 13 T3IN 12 R5OUT
MAX3185
R1 R2 TTL/CMOS LOGIC I/O
R2IN 3 R3IN 4 T1OUT 5 T2OUT 6 R4IN 7 T3OUT 8 R5IN 9
T2 T3
VSS 10
MAX3185
SO/SSOP
11 GND
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs MAX3185
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 = +70C) Wide SO (derate 10.00mW/C above +70C)..............800mW SSOP (derate 8.00mW/C above +70C) ....................640mW Operating Temperature Ranges MAX3185C_ P .....................................................0C to +70C MAX3185E_ P ..................................................-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 Operating Range RS-232 Input Threshold Low RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance Receiver Output Short-Circuit Current 2 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 = 0V, VT_OUT = 2V 5.0 9.5 300 35 60 V mA VOLR VOHR ROUT; ISINK = 3.2mA ROUT; ISOURCE = 1mA VCC - 0.6 VILT VIHT TIN TIN 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 -13.2 380 185 185 5.5 13.2 -10.8 1500 500 500 A V SYMBOL CONDITIONS MIN TYP MAX UNITS
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs
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 3, 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 IEC1000-4-2 (Contact Discharge) IEC1000-4-2 (Air-Gap Discharge) 15 8 15 kV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3185
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 CL = 50pF to 2500pF
Guaranteed Data Rate
DR
Mouse Driveability
T3OUT = -5mA, T1OUT = T2OUT = +5mA
_______________________________________________________________________________________
3
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs MAX3185
__________________________________________Typical Operating Characteristics
(VCC = +5.0V, VDD = +12.0V, VSS = -12.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3185-TOC01
SUPPLY CURRENT vs. LOAD CAPACITANCE
MAX3185-TOC02
SLEW RATE vs. LOAD CAPACITANCE
14 12 SLEW RATE (V/s) FALL 10 8 6 4 2 0
1 TRANSMITTER 240kbps 2 TRANSMITTERS 15kbps 3k + CL LOAD
MAX3185-TOC03
20 15
IDD, 240kbps IDD, 120kbps
25 20 15 SUPPLY CUREENT (mA) 10 5 0 -5 -10 -15 -20 -25
ICC IDD, 240kbps IDD, 120kbps IDD, 20kbps 1 TRANSMITTER AT DATA RATE
16
SUPPLY CUREENT (mA)
10
IDD, 20kbps 1 TRANSMITTER AT DATA RATE
5
ICC 2 TRANSMITTERS AT DATA RATE / 16 3k + 2500pF LOAD ISS, 120kbps ISS, 240kbps
0 -5 -10 -15 -20 10.8
ISS, 20kbps
ISS, 20kbps 2 TRANSMITTERS AT DATA RATE / 16 ISS, 120kbps ISS, 240kbps 3k + CL LOAD
RISE
11.4
12.0
12.6
13.2
0
SUPPLY VOLTAGE (V)
1000 2000 3000 4000 LOAD CAPACITANCE (pF)
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3185-TOC04
MAX3185 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER
TRANSMITTER OUTPUT VOLTAGE (V)
MAX3185-TOC05
SLEW RATE vs. TEMPERATURE
MAX3185-TOC06
12.5 TRANSMITTER OUTPUT VOLTAGE (V) 10.0 7.5 5.0 2.5 0 -2.5 -5.0 -7.5
120kbps 240kbps 1 TRANSMITTER AT DATA RATE 2 TRANSMITTERS AT DATA RATE / 16 3k + CL LOAD
15 10 VOUT+ 5
T1
25
20 SLEW RATE (V/s) FALL, 500pF RISE, 500pF 10 RISE, 2000pF 5 0 FALL, 2000pF
15
0 -5 -10 -15
VCC
VOUT+
T2
VOUTT3
240kbps 120kbps
VOUT-
-10.0 -12.5 0
1000 2000 3000 4000 LOAD CAPACITANCE (pF)
5000
0
2
4
6
8
10
12
14
16
18
-55 -35 -15
5
25 45
65 85 105 125
LOAD CURRENT PER TRANSMITTER (mA)
TEMPERATURE (C)
4
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs
______________________________________________________________Pin Description
PIN 1 12, 14, 17, 18, 19 16, 15, 13 10 11 2, 3, 4, 7, 9 5, 6, 8 20 NAME VDD R5OUT-R1OUT T3IN, T2IN, T1IN VSS GND R1IN-R5IN T1OUT, T2OUT, T3OUT VCC FUNCTION Supply-Voltage Input, +10.8V to +13.2V Receiver Outputs, swing between GND and VCC Transmitter Inputs Supply-Voltage Input, -10.8V to -13.2V Ground. Connect system to ground. Receiver Inputs Transmitter Outputs, swing between VDD and VSS Supply-Voltage Input, +4.5V to +5.5V
MAX3185
_______________Detailed Description
RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
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 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)
Cs 150pF
STORAGE CAPACITOR
Figure 1a. IEC1000-4-2 ESD Test Model
I 100% 90% IPEAK
ESD Test Conditions
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 30ns 60ns t
Figure 1b. IEC1000-4-2 ESD-Generator Current Waveform
_______________________________________________________________________________________ 5
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs MAX3185
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. 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. 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 0.1F 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.
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
6
Figure 2b. Human Body Model Current Waveform
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs
___________________Chip Information
3.0V DRIVER INPUT 0V 1.5V TPHL TPLH VOH 3.3V 3.0V VOUT -3.0V -3.3V 0V
MAX3185
TRANSISTOR COUNT: 217
tF2 tF1
tR2 VOL tR1
SIGNAL GENERATOR
RL
CL
Figure 3. Slew-Rate Test Circuit and Timing Diagram
_______________________________________________________________________________________
7
15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs MAX3185
________________________________________________________Package Information
DIM 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 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
D 0- 8 A e B
0.101mm 0.004in.
A1
C
L
A A1 B C E e H L
DIM PINS
E
H
Wide SO SMALL-OUTLINE PACKAGE (0.300 in.)
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 10.10 10.50 11.35 11.75 12.60 13.00 15.20 15.60 17.70 18.10
21-0042A
DIM A A1 B C D E e H L
E
H
C
L
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 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
DIM PINS
e
A B D
A1
SSOP SHRINK SMALL-OUTLINE PACKAGE
D D D D D
14 16 20 24 28
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) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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