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19-1471; Rev 1; 9/99
15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
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 50A 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 LapLinkTM).
Features
o Two Complete Serial Ports in a Single 38-Pin TSSOP Package o Requires Only +12V Supply and Logic Supply (+3V to +5.5V) o No Negative Supply Required o One Receiver Active per Port in Standby for System Wake-Up o 460kbps Data Rate; LapLink Compatible o Enhanced ESD Protection 15kV--Human Body Model 8kV--IEC 1000-4-2, Contact Discharge 15kV--IEC 1000-4-2, Air-Gap Discharge o Low 50A Standby Current o Operates with Either +3V or +5V Logic o Guaranteed Mouse Driveability o Small 0.1F Capacitors o Flow-Through Pinout
MAX3209E
Pin Configuration
TOP VIEW
R5OUT R4OUT R3OUT 1 2 3 4 5 6 7 8 9 38 R5IN 37 R4IN 36 R3IN 35 R2IN 34 R1IN
Ordering Information
PART MAX3209ECUU MAX3209EEUU TEMP. RANGE 0C to +70C -40C to +85C PIN-PACKAGE 38 TSSOP 38 TSSOP
R2OUT R1OUT T3IN T2IN T1IN
MAX3209E
33 T3OUT 32 T2OUT 31 T1OUT 30 V29 C128 GND 27 T4OUT 26 T5OUT 25 T6OUT 24 R6IN 23 R7IN 22 R8IN 21 R9IN 20 R10IN
________________________Applications
Desktop PCs Motherboards Instruments Equipment Requiring IEC 1000-4-2 Compliance Telecommunications Network Servers
Typical Operating Circuit appears at end of data sheet.
VSTBY
VDD 10 C1+ 11 T4IN 12 T5IN 13 T6IN 14 R6OUT 15 R7OUT 16 R8OUT 17 R9OUT 18 R10OUT 19
LapLink is a trademark of Traveling Software.
TSSOP
________________________________________________________________ Maxim Integrated Products
1
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
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 = +70C) TSSOP (derate 11.8mW/C above +70C) ..................941mW Operating Temperature Ranges MAX3209EC_ _ ...................................................0C to +70C MAX3209EE_ _ ................................................-40C to +85C Storage Temperature Range ............................-65C to +150C 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
(VDD = +10.8V to +13.2V, VSTBY = +3V to +5.5V, C1 = C2 = 0.1F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, VDD = +12V, VSTBY = +3.3V.) PARAMETER DC CHARACTERISTICS Operating Voltage Range VDD STBY IDD Supply Current ISTBY TRANSMITTER LOGIC INPUTS Input Logic Threshold Low Input Logic Threshold High Input Pull-Up Current RECEIVER LOGIC OUTPUTS Output Voltage Low Output Voltage High Receiver Output Leakage Current RS-232 TRANSMITTER OUTPUTS Output Voltage Swing RS-232 Output Short-Circuit Current Transmitter Output Resistance RS-232 RECEIVER INPUTS Receiver Input Voltage Range RS-232 Input Threshold Low RS-232 Input Threshold High RS-232 Input Hysteresis RS-232 Input Resistance 2 TA = +25C TA = +25C VSTBY = 3.3V TA = +25C 2.4 0.2 3 5 1 7 -25 25 0.4 V V V V k All transmitter outputs loaded with 3k to GND VT_OUT = 0 VDD = VSTBY = 0, VOUT = 2V 300 5.0 10 60 V mA VOLR VOHR R_OUT; ISINK = 1.6mA R_OUT VDD = 0, VSTBY = 5V ISOURCE = 40A ISOURCE = 1mA VSTBY - 0.3 VSTBY - 0.6 0.05 5 0.4 V V A VILT VIHT T_IN T_IN Transmitter input at GND 2 25 0.8 V V A VDD = +12V, no load, all transmitter inputs at VSTBY, all receiver inputs at VSTBY or unconnected VDD = 0, VSTBY = +3.3V, no load, all transmitter inputs at VSTBY, all receiver inputs at VSTBY or unconnected 10.8 3 0.5 13.2 5.5 1 V SYMBOL CONDITIONS MIN TYP MAX UNITS
mA
50
100
A
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +10.8V to +13.2V, VSTBY = +3V to +5.5V, C1 = C2 = 0.1F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, VDD = +12V, VSTBY = +3.3V.) PARAMETER ESD CHARACTERISTICS Human Body Model ESD Protection IEC 1000-4-2 (Contact Discharge) IEC 1000-4-2 (Air-Gap Discharge) TRANSMITTER TIMING CHARACTERISTICS (Figure 1) Guaranteed Data Rate DR RL = 3k to 7k, CL = 50pF to 1000pF, two transmitters switching T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3k to GND, T1OUT and T2OUT loaded with 2.5mA each tPLHT tPHLT CL = 1000pF CL = 1000pF RL = 3k to 7k, VSTBY = 3.3V, CL = 50pF to 1000pF, TA = +25C, measured from +3V to -3V or -3V to +3V +6 460 kbps 15 8 15 kV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3209E
Mouse Driveability Transmitter Output Propagation Delay, Low to High Transmitter Output Propagation Delay, High to Low Transmitter Output Slew Rate
-5
V
1 1
s s
SR
6
12
30
V/s
RECEIVER TIMING CHARACTERISTICS Receiver Output Propagation Delay, Low to High Receiver Output Propagation Delay, High to Low tPLHR tPHLR CL = 150pF CL = 150pF 0.4 0.4 1 1 s s
Typical Operating Characteristics
(VSTBY = +5V, VDD = +12V, C1 = C2 = 0.1F, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. LOAD CAPACITANCE
460kbps 240kbps
MAX3209E-02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3209E-01
35 30 SUPPLY CURRENT (mA) 25 20 15 10 C1 = C2 = 0.1F 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE ALL TRANSMITTERS AT 3k + 1000pF 11.4 12.0 12.6 SUPPLY VOLTAGE (V) 460kbps 240kbps 120kbps
30 25 SUPPLY CURRENT (mA) 20
120kbps 15 10 5 0 2 TRANSMITTERS AT DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3k + CL 0 1000 2000 3000 4000 5000
5 10.8
13.2
LOAD CAPACITANCE (pF)
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
Typical Operating Characteristics (continued)
(VSTBY = +5V, VDD = +12V, C1 = C2 = 0.1F, TA = +25C, unless otherwise noted.)
RECEIVER OUTPUT LOW VOLTAGE vs. SINK CURRENT
MAX3209E-03
RECEIVER OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT
RECEIVER OUTPUT HIGH VOLTAGE (V) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
MAX3209E-04
0.6 RECEIVER OUTPUT LOW VOLTAGE (V) 0.5 0.4 0.3 0.2 0.1 0
5.0
0
1
2
3
4
5
6
7
8
9
0
0
5
10
15 ISOURCE (mA)
20
25
30
ISINK (mA)
Pin Description
3.0V
PIN 1-5, 15-19 6, 7, 8, 12, 13, 14 9 10 11 20-24, 34-38 25, 26, 27, 31, 32, 33 28 29 30
NAME R_OUT T_IN VSTBY VDD C1+ R_IN T_OUT GND C1V-
FUNCTION TTL/CMOS Receiver Outputs TTL/CMOS Transmitter Inputs Standby Power Supply for R5 and R10 +12V Single-Supply Voltage Positive Terminal of the Inverting Charge-Pump Capacitor RS-232 Receiver Inputs RS-232 Transmitter Outputs Ground Negative Terminal of the Inverting Charge-Pump Capacitor -12V generated by the inverting charge pump
DRIVER INPUT 0
1.5V tPHL tPLH VOH 3.3V 3.0V
VOUT -3.0V -3.3V
0V
tF2 tF1
tR2 VOL tR1
SIGNAL GENERATOR
RL
CL
Figure 1. Slew-Rate Test Circuit and Timing Diagram
4
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
Detailed Description
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 RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
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.
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
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 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.
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
Cs 150pF
STORAGE CAPACITOR
Figure 3a. IEC 1000-4-2 ESD Test Model
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
I 100% 90% IPEAK
+12V
POWER-MANAGEMENT UNIT
VSTBY SUPER I/O
VDD
MAX3209E
R5
10% tR = 0.7ns to 1ns 30ns 60ns t
R10 ALL OTHER RECEIVERS INACTIVE ALL TRANSMITTERS INACTIVE GND
Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform
R_ T_
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.
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.
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 100A 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.
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.
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 0.1F 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.
Table 1. Logic Family Compatibility with Various Supply Voltages
SYSTEM POWERSUPPLY VOLTAGE (V) 3.3 VSTBY SUPPLY VOLTAGE (V) 3.3 COMPATIBILITY
Compatible with all CMOS families. Compatible with all TTL and CMOS families. Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS.
5
5
5
3.3
6
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
__________Typical Operating Circuit
+5V +12V +5V +12V
___________________Chip Information
TRANSISTOR COUNT: 774
0.1F
VSTBY
VDD
0.1F 0.1F
VCC
VDD
0.1F
MAX3209E
T1 T2 TTL/CMOS LOGIC I/O RS-232 T3 INTERCONNECTING R1 CABLE R2 R3 R4 R5 T4 T5 T6 R6 R7 R8 R9 C1 0.1F C1+ R10 C1GND V0.1F C2 V+ V+ VTX
MAX3186
R1 R2 R3 T1 T2 T3 T4 T5 GND VSS TTL/CMOS LOGIC I/O
-12V
0.1F
MOUSE
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15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
MAX3209E
________________________________________________________Package Information
TSSOP, 4.40mm.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) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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