_______________General Description
The MAX3186 is a complete DCE RS-232 serial port
designed to meet the stringent ESD requirements of the
European community. All transmitter outputs and receiv-
er 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 MAX3186 has five RS-232 transmitters, three RS-
232 receivers, and no charge pump, optimizing it for
operation in modem 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 300µA for
IDD and ISS, and less than 1mA for ICC.
The MAX3186 is available in an SO package and in the
tiny SSOP that further reduces board space.
________________________Applications
Modems
ISDN Modems
Instruments
Equipment Meeting IEC1000-4-2
____________________________Features
♦Enhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap Discharge
♦Latchup Free During an ESD Event
♦20-Pin SSOP or SO Packages
♦Guaranteed 230kbps Data Rate
♦Flow-Through Pinout
♦Complete DCE Serial Port
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
VCC
T1IN
R1OUT
T2INT2OUT
R1IN
T1OUT
VDD
TOP VIEW
R2OUT
R3OUT
T3IN
T4IN
T4OUT
T3OUT
R3IN
R2IN
12
11
9
10
T5IN
GND
VSS
T5OUT
SO/SSOP
MAX3186
__________________Pin Configuration
MAX3186 MAX3185
RS-232
INTERCONNECTING
CABLE
T1
T2
T3
T4
T5
R1
R1
R2
R3
R4
R5
R3
R2
T1
T2
T3
TTL/CMOS
LOGIC
I/O
TTL/CMOS
LOGIC
I/O
__________Typical Operating Circuit
19-1077; Rev 0; 9/96
PART
MAX3186CWP
MAX3186CAP 0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 SO
20 SSOP
______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX3186EWP -40°C to +85°C 20 SO
MAX3186EAP -40°C to +85°C 20 SSOP
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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= +25°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.
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= +70°C)
Wide SO (derate 10.00mW/°C above +70°C)...............800mW
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Ranges
MAX3186C_P.......................................................0°C to +70°C
MAX3186E_P....................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
VCC = VDD = VSS = 0V, VT_OUT = ±2V
VDD = 12V, VSS = -12V, RL= 3kΩ
TIN
VDD = 7.0V, VSS = -7.0V, RL= 3kΩ
TIN
No load
No load
ROUT; ISOURCE = 1mA
No load
ROUT; ISINK = 3.2mA
CONDITIONS
V2.4RS-232 Input Threshold High V0.75RS-232 Input Threshold Low
V-25 25
Receiver Input Voltage
Operating Range
mA±35 ±60
RS-232 Output Short-Circuit
Current
Ω300Transmitter Output Resistance
V
±9.5
Output Voltage Swing ±5.0
VVCC - 0.6VOHR
Output Voltage High V0.4VOLR
Output Voltage Low
10.8 13.2VDD
4.5 5.5VCC
µA0.01 1Input Leakage Current V2.0VIHT
Input Logic Threshold High V0.8VILT
Input Logic Threshold Low
V
-13.2 -10.8VSS
Operating Voltage Range
230 1000ICC 280 750IDD µA
280 750ISS
Supply Current
UNITSMIN TYP MAXSYMBOLPARAMETER
V0.65RS-232 Input Hysteresis kΩ357RS-232 Input Resistance
mA±10
Receiver Output Short-Circuit
Current
RECEIVER INPUTS
TRANSMITTER OUTPUTS
LOGIC
DC CHARACTERISTICS
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
_______________________________________________________________________________________ 3
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= +25°C.)
IEC1000-4-2 (Contact Discharge)
Human Body Model
IEC1000-4-2 (Air-Gap Discharge)
CONDITIONS
±8
±15 kV
±15
ESD Protection
UNITSMIN TYP MAXSYMBOLPARAMETER
VCC = 5V, CL= 50pF, TA= +25°C 4.0tPLHR µs
Receiver Output
Propagation Delay, Low to High
120
VDD = 12V, VSS = -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C 4tPHLT µs
Transmitter Output
Propagation Delay, High to Low
VDD = 12V, VSS = -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C 0.4tSKT µs
Transmitter Propagation Delay
Skew, |tPLHT - tPHLT |
430
C
L
= 150pF to
2500pF
VDD = 12V, VSS = -12V,
RL= 3kΩto 7kΩ,
measured from +3V to -3V
or -3V to +3V, Figure 3,
TA= +25°C 830
SR V/µsTransition Output Slew Rate CL= 50pF to
1000pF
VCC = 5V, CL= 50pF, TA= +25°C 4.0tPHLR µs
Receiver Output
Propagation Delay, High to Low
VCC = 5V, CL= 50pF, TA= +25°C 0.4tSKR µs
Receiver Propagation Delay
Skew, |tPLHR - tPHLR |
VCC = 5V, VDD = 12V,
VSS = -12V,
RL= 3kΩto 7kΩ,
TA= +25°C 230 kbpsDRGuaranteed Data Rate
CL= 50pF to
2500pF
CL= 50pF to
1000pF
VDD = 12V, VSS = -12V, RL= 3kΩ,
CL= 1000pF, TA= +25°C 4tPLHT µs
Transmitter Output
Propagation Delay, Low to High
ESD CHARACTERISTICS
TIMING CHARACTERISTICS
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(VCC = +5.0V, VDD = +12.0V, VSS = -12.0V, TA= +25°C, unless otherwise noted.)
-25
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3186-TOC01
SUPPLY VOLTAGE (V)
SUPPLY CUREENT (mA)
-20
-15
-10
-5
5
0
10
15
20
25
13.212.612.011.4010.80
IDD, 240kbps
IDD, 120kbps
IDD, 20kbps
ICC
3kΩ + 2500pF LOAD
1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
ISS, 20kbps
ISS, 120kbps
ISS, 240kbps
SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3186-TOC02
LOAD CAPACITANCE (pF)
SUPPLY CUREENT (mA)
25
20
15
10
5
0
-5
-10
-15
-20
-25 4000 50003000200010000
IDD, 240kbps
IDD, 120kbps
IDD, 20kbps
ICC 1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
3kΩ + CL LOAD
ISS, 20kbps
ISS, 120kbps
ISS, 240kbps
SLEW RATE
vs. LOAD CAPACITANCE
MAX3186-TOC03
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
16
14
12
10
8
6
4
2
04000 50003000200010000
1 TRANSMITTER 240kbps
4 TRANSMITTERS 15kbps
3kΩ + CL LOAD
RISE
FALL
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3186-TOC04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
12.5
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5 4000 50003000200010000
240kbps
120kbps
120kbps
240kbps
1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
3kΩ + CL LOAD
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CURRENT PER TRANSMITTER
MAX3186-TOC05
LOAD CURRENT PER TRANSMITTER (pF)
SLEW RATE (V/µs)
15
10
5
0
-5
-10
-15 10 12 14 16 186824
0
VOUT+
VOUT-
T1
VCC
VOUT+
VOUT-
T2
T3
SLEW RATE
vs. TEMPERATURE
MAX3186-TOC06
TEMPERATURE (°C)
SLEW RATE (V/µs)
25
20
15
10
5
085 105 12545 65525-35 -15-55
RISE, 500pF
FALL, 500pF
RISE, 2000pF FALL, 2000pF
_______________Detailed Description
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX3186 driver outputs and receiver
inputs have extra protection against static electricity
found in normal operation. Maxim’s engineers devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV, without damage. After an ESD
event, the MAX3186 continues working without latchup.
ESD protection can be tested in several ways. The
transmitter outputs and the receiver inputs are charac-
terized 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)
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
_______________________________________________________________________________________ 5
______________________________________________________________Pin Description
PIN NAME FUNCTION
1 VDD Supply-Voltage Input, +10.8V to +13.2V
2, 4, 7, 8, 9 T1OUT–T5OUT Transmitter Outputs, swing between VDD and VSS
3, 5, 6 R1IN, R2IN, R3IN Receiver Inputs
10 VSS Supply-Voltage Input, -10.8V to -13.2V
11 GND Ground. Connect to system ground.
12, 13, 14, 17, 19 T5IN–T1IN Transmitter Inputs
15, 16, 18 R3OUT, R2OUT, R1OUT Receiver Outputs, swing between GND and VCC
20 VCC Supply-Voltage Input, +4.5V to +5.5V
CHARGE-CURRENT
LIMIT RESISTOR DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC 50M to 100M RD 330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 1b. IEC1000-4-2 ESD Generator Current Waveform
tr = 0.7ns to 1ns 30ns 60ns
t
100%
90%
10%
IPEAK
I
Figure 1a. IEC1000-4-2 ESD Test Model
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
6 _______________________________________________________________________________________
Human Body Model
Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5kΩresistor.
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3186 helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD-protection com-
ponents.
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 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 stor-
age 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 man-
ufacturing. Therefore, the Machine Model is less rele-
vant 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 the 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 0.1µF
capacitors as close to the part as possible to ensure
maximum ESD protection.
Tie any transmitter inputs to GND or VCC. No external
protection diodes are needed because the MAX3186 is
not sensitive to power-supply sequencing.
CHARGE-CURRENT
LIMIT RESISTOR DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC 1M RD 1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 2a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRL TIMEtDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
00
AMPERES
Figure 2b. Human Body Model Current Waveform
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
_______________________________________________________________________________________ 7
___________________Chip Topography
TRANSISTOR COUNT: 195
SUBSTRATE CONNECTED TO GND
T1IN
T2IN
T3IN
T4IN
T5IN
R1OUT
R2OUT
R3OUT 0.181"
(4.597mm)
0.094"
(2.388mm)
VSS GND
VDD VCC
T1OUT
R1IN
T2OUT
R2IN
R3IN
T3OUT
T4OUT
T5OUT
tF2
tF1
TPHL TPLH
tR1
tR2
1.5V
3.0V
0V
0V
DRIVER
INPUT
VOUT
VOH
VOL
3.3V
3.0V
-3.0V
-3.3V
RLCL
SIGNAL
GENERATOR
Figure 3. Slew-Rate Test Circuit and Timing Diagram
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
MAX3186
±15kV ESD-Pr otected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
________________________________________________________Package Information
DIM
A
A1
B
C
E
e
H
L
MIN
0.093
0.004
0.014
0.009
0.291
0.394
0.016
MAX
0.104
0.012
0.019
0.013
0.299
0.419
0.050
MIN
2.35
0.10
0.35
0.23
7.40
10.00
0.40
MAX
2.65
0.30
0.49
0.32
7.60
10.65
1.27
INCHES MILLIMETERS
21-0042A
Wide SO
SMALL-OUTLINE
PACKAGE
(0.300 in.)
DIM
D
D
D
D
D
MIN
0.398
0.447
0.496
0.598
0.697
MAX
0.413
0.463
0.512
0.614
0.713
MIN
10.10
11.35
12.60
15.20
17.70
MAX
10.50
11.75
13.00
15.60
18.10
INCHES MILLIMETERS
PINS
16
18
20
24
28
1.27
0.050
L
HE
D
e
A
A1 C
0°- 8°
0.101mm
0.004in.
B
L
DIM
A
A1
B
C
D
E
e
H
L
α
DIM
D
D
D
D
D
MIN
0.068
0.002
0.010
0.004
0.205
0.301
0.025
0˚
MIN
0.239
0.239
0.278
0.317
0.397
MAX
0.078
0.008
0.015
0.008
0.209
0.311
0.037
8˚
MAX
0.249
0.249
0.289
0.328
0.407
MIN
1.73
0.05
0.25
0.09
5.20
7.65
0.63
0˚
MIN
6.07
6.07
7.07
8.07
10.07
MAX
1.99
0.21
0.38
0.20
5.38
7.90
0.95
8˚
PINS
14
16
20
24
28
MAX
6.33
6.33
7.33
8.33
10.33
INCHES
INCHES
MILLIMETERS
MILLIMETERS
α
SSOP
SHRINK
SMALL-OUTLINE
PACKAGE
HE
D
A
A1
C
B
0.65 BSC0.0256 BSC
21-0056A
e
SEE VARIATIONS