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19-1120; Rev 0; 9/96
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC
_______________General Description
The MAX1406 is an RS-232 IC designed to meet the stringent electrostatic discharge (ESD) requirements of the European community. All transmitter outputs and receiver inputs are protected to 15kV using IEC1000-4-2 Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Discharge, and 15kV using the Human Body Model. The MAX1406 has three RS-232 transmitters and three RS-232 receivers, and is optimized for operation in printer, modem, and telecom 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 500A for IDD and ISS, and less than 1mA for ICC. The MAX1406 is pin and functionally compatible with the industry-standard MC145406, so existing designs can instantly become Electromagnetic Compatibility (EMC) compliant. The MAX1406 is available in DIP and SO packages, and in a tiny SSOP that 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 16-Pin SSOP or SO Packages o Guaranteed 230kbps Data Rate o Flow-Through Pinout o Pin Compatible with MC145406
MAX1406
______________Ordering Information
PART MAX1406CPE MAX1406CWE MAX1406CAE MAX1406C/D MAX1406EPE MAX1406EWE MAX1406EAE TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 Plastic DIP 16 Wide SO 16 SSOP Dice* 16 Plastic DIP 16 Wide SO 16 SSOP
________________________Applications
Telecommunications Modems Printers Instruments Equipment Meeting IEC1000-4-2
*Dice are specified at TA = +25C, DC parameters only.
________________Functional Diagram
+5V
0.1F
__________________Pin Configuration
TOP VIEW
VDD 1 R1IN 2 T1OUT 3 R2IN 4 T2OUT 5 R3IN 6 T3OUT 7 VSS 8 16 VCC 15 R1OUT 14 T1IN
+12V 0.1F
VDD
VCC
VSS
-12V 0.1F
MAX1406
T1IN T2IN T3IN R1OUT R2OUT R3OUT T1 T2 T3 R1 R2 R3 GND T1OUT T2OUT T3OUT R1IN R2IN R3IN
MAX1406
13 R2OUT 12 T2IN 11 R3OUT 10 T3IN 9 GND
DIP/SO/SSOP
________________________________________________________________ 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, 3-Tx/3-Rx RS-232 IC MAX1406
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) DIP (derate 10.53mW/C above +70C) .......................842mW Wide SO (derate 20.00mW/C above +70C)...................1.6W SSOP (derate 8.00mW/C above +70C) .....................640mW Operating Temperature Ranges MAX1406C_E .......................................................0C to +70C MAX1406E_E ....................................................-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 0.65 -25 0.75 2.4 +25 V V V V 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 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 4.5 10.8 -13.2 230 185 185 5.5 13.2 -10.8 1000 500 500 A V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC
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 RECEIVER INPUTS (continued) RS-232 Input Resistance Receiver Output Short-Circuit Current ESD CHARACTERISTICS Human Body Model ESD Protection IEC1000-4-2 (Contact Discharge) IEC1000-4-2 (Air-Gap Discharge) 15 8 15 kV 3 5 10 7 k mA SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX1406
TIMING CHARACTERISTICS
(TA = +25C, unless otherwise noted.) PARAMETER Transmitter Output Propagation Delay, Low to High Transmitter Output Propagation Delay, High to Low Transmitter Propagation Delay Skew, |tPLHT - tPHLT| SYMBOL tPLHT tPLHT tSKT CONDITIONS VDD = 12V, VSS = -12V, RL = 3k, CL = 1000pF VDD = 12V, VSS = -12V RL = 3k, CL = 1000pF VDD = 12V, VSS = -12V RL = 3k, CL = 1000pF CL = 150pF to 2500pF CL = 50pF to 1000pF 4 8 12 12 MIN TYP MAX 4 UNITS s s s
4
0.4 30
Transition Output Slew Rate
SR
VDD = 12V, VSS = -12V, RL = 3k to 7k, measured from +3V to -3V or -3V to +3V
V/s 30 4.0 s s s
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 VCC = 5V, CL = 50pF VCC = 5V, CL = 50pF CL = 150pF to 2500pF CL = 50pF to 1000pF 120
4.0
0.4
Guaranteed Data Rate
DR
VCC = 5V, VDD = 12V, VSS = -12V, RL = 3k to 7k
kbps 230
_______________________________________________________________________________________
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15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC MAX1406
__________________________________________Typical Operating Characteristics
(VCC = +5.0V, VDD = +12.0V, VSS = -12.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1406 TOC-1
SUPPLY CURRENT vs. LOAD CAPACITANCE
20 SUPPLY CURRENT (mA) 15 10 5 0 -5 -10 -15 -20 -25 ICC IDD, 240kbps IDD, 120kbps IDD, 20kbps 3k + CL 1 TRANSMITTER AT DATA RATE 2 TRANMITTERS AT DATA RATE/16 ISS, 20kbps ISS, 120kbps ISS, 240kbps 0 1000 2000 3000 4000 5000
MAX1406 TOC-2 MAX1406 TOC-3
20 15 SUPPLY CURRENT (mA) 10 5 0 -5 -10 -15
IDD, 240kbps IDD, 120kbps IDD, 20kbps ICC 1 TRANSMITTER AT DATA RATE 2 TRANMITTERS AT DATA RATE/16 3k + 2500pF LOAD
25
ISS, 20kbps ISS, 120kbps ISS, 240kbps
-20 10.8
11.4
12.0
12.6
13.2
SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
SLEW RATE vs. LOAD CAPACITANCE
MAX1406 TOC-4
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
12.5 TRANSMITTER OUTPUT VOLTAGE (V) 10.0 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 120kbps 1 TRANSMITTER AT DATA RATE 2 TRANMITTERS AT DATA RATE/16 3k + CL LOAD 240kbps 120kbps 240kbps
16 14 12 SLEW RATE (V/s) 10 8 6 4 2 0 0 1000 2000 3000 4000 1 TRANSMITTER AT DATA RATE 2 TRANMITTERS AT DATA RATE/16 3k + CL LOAD RISE FALL
-10.0 -12.5 0 1000 2000 3000
5000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC
______________________________________________________________Pin Description
PIN 1 3, 5, 7 2, 4, 6 8 9 10, 12, 14 11, 13, 15 16 NAME VDD T1OUT, T2OUT,T3OUT R1IN, R2IN, R3IN VSS GND T3IN, T2IN, T1IN R3OUT, R2OUT, R1OUT VCC FUNCTION Supply-Voltage Input, +10.8V to +13.2V Transmitter Outputs, swing between VDD and VSS Receiver Inputs Supply-Voltage Input, -10.8V to -13.2V Ground. Connect to system ground. Transmitter Inputs. Tie unused inputs to GND or VCC. Receiver Outputs, swing between GND and VCC Supply-Voltage Input, +4.5V to +5.5V
MAX1406
3.0V DRIVER INPUT 0V 1.5V tPHL tPLH VOH 3.3V 3.0V VOUT -3.0V -3.3V 0V
When the power is off, the MAX1406 outputs are permitted to be driven up to 15V. The transmitter inputs do not have internal pull-up resistors. Connect unused inputs to GND or VCC.
RS-232 Receivers
The receiver inputs invert and convert the RS-232 signals to CMOS-logic output levels. The MAX1406 has hysteresis of 650mV. The receiver output swings between GND and VCC.
15kV ESD Protection
As with all Maxim devices, electrostatic discharge (ESD) protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX1406 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 MAX1406 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 Discharge method specified in IEC1000-4-2 (formerly IEC801-2)
tF2 tF1
tR2 VOL tR1
SIGNAL GENERATOR
RL
CL
Figure 1. Slew-Rate Test Circuit and Timing Diagram
_______________Detailed Description
RS-232 Transmitters
The transmitters are inverting level translators that convert CMOS-logic input levels to an EIA/TIA-232 voltage between 5V and 13.2V, into a load between 3k and 7k. The MAX1406 guarantees a 230kbps data rate with a worst-case load of 3k and 1000pF, providing compatibility with PC-to-PC communication software.
ESD Test Conditions
ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results.
_______________________________________________________________________________________
5
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC MAX1406
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 MAX1406 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 (Figure 3). Because series resistance is lower in the IEC1000-4-2 ESD test model, 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 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.
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE
RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Cs 150pF
STORAGE CAPACITOR
a)
a)
I 100% 90% IPEAK 10% 0 0 tRL TIME tDL CURRENT WAVEFORM
IP 100% 90% AMPERES 36.8%
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
10% tr = 0.7ns to 1ns 30ns 60ns t
b)
Figure 2. Human Body ESD Test Model and ESD-Generator Current Waveform
b)
Figure 3. IEC1000-4-2 Test Model and ESD-Generator Current Waveform
6
_______________________________________________________________________________________
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx RS-232 IC
__________Applications Information
Because the MAX1406 is not sensitive to power-supply sequencing, no external protection diodes are required. Any of the three supplies can power up first. However, use proper layout techniques to ensure other devices on your board are not damaged in case of an ESD event. * Minimize the ground-lead return path to the power supply, because currents as high as 60A can pass into the ground. * Use a separate return path to the power supply. * Make trace widths greater than 40 mils. * Bypass VCC, VDD, and VSS with 0.1F capacitors as close to the MAX1406 as possible to ensure maximum ESD protection. * Tie any unused transmitter inputs to GND or VCC to minimize power consumption.
___________________Chip Topography
0.094" (2.38mm) VDD VCC
R1IN R1OUT
MAX1406
T1OUT
R2IN
T1IN
R2OUT T2IN
0.153" T2OUT (3.89mm)
R3OUT R3IN T3OUT T3IN
VSS
GND
TRANSISTOR COUNT: 161 SUBSTRATE CONNECTED TO GND
_______________________________________________________________________________________
7
15kV ESD-Protected, EMC-Compliant, 230kbps, 3-Tx/3-Rx, RS-232 IC MAX1406
________________________________________________________Package Information
E D A3 A A2 E1
DIM A A1 A2 A3 B B1 C D1 E E1 e eA eB L 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 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
L A1 e B D1
0 - 15 C B1 eA eB
Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.)
PKG. DIM PINS P P P P P N D D D D D D 8 14 16 18 20 24
DIM
D 0- 8 A e B
0.101mm 0.004in.
A1
C
L
A A1 B C E e H L
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
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
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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