19-1077; Rev 0; 9/96
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
_______________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
I
DD
and I
SS
, and less than 1mA for I
CC
.
The MAX3186 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 or SO Packages
o
Guaranteed 230kbps Data Rate
o
Flow-Through Pinout
o
Complete DCE Serial Port
MAX3186
________________________Applications
Modems
ISDN Modems
Instruments
Equipment Meeting IEC1000-4-2
______________Ordering Information
PART
MAX3186CWP
MAX3186CAP
MAX3186EWP
MAX3186EAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 SO
20 SSOP
20 SO
20 SSOP
__________Typical Operating Circuit
__________________Pin Configuration
MAX3186
T1
T2
TTL/CMOS
LOGIC
I/O
RS-232
T3
INTERCONNECTING
T4
CABLE
T5
R1
R2
R3
MAX3185
R1
R2
R3
R4
R5
T1
T2
T3
TTL/CMOS
LOGIC
I/O
TOP VIEW
V
DD
1
T1OUT 2
R1IN 3
T2OUT 4
R2IN 5
R3IN 6
T3OUT 7
T4OUT 8
T5OUT 9
V
SS
10
20 V
CC
19 T1IN
18 R1OUT
17 T2IN
16 R2OUT
15 R3OUT
14 T3IN
13 T4IN
12 T5IN
MAX3186
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 Modems
MAX3186
ABSOLUTE MAXIMUM RATINGS
V
CC
...........................................................................-0.3V to +7V
V
DD
.........................................................................-0.3V to +14V
V
SS
..........................................................................+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 (V
CC
+ 0.3V)
Short-Circuit Duration
T
OUT
(one at a time)................................................Continuous
R
OUT
(one at a time) ...............................................Continuous
Continuous Power Dissipation (T
A
= +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
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
(V
CC
= +4.5V to +5.5V, V
DD
= +10.8V to +13.2V, V
SS
= -10.8V to -13.2V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
DC CHARACTERISTICS
V
CC
Operating Voltage Range
V
DD
V
SS
I
CC
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
kΩ
mA
V
DD
= 7.0V, V
SS
= -7.0V, R
L
= 3kΩ
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ
V
CC
= V
DD
= V
SS
= 0V, V
T_OUT
= ±2V
±5.0
±9.5
300
±35
±60
V
Ω
mA
V
OLR
V
OHR
R
OUT
; I
SINK
= 3.2mA
R
OUT
; I
SOURCE
= 1mA
V
CC
- 0.6
V
ILT
V
IHT
T
IN
T
IN
2.0
0.01
1
0.4
0.8
V
V
µA
V
V
I
DD
I
SS
No load
No load
No load
4.5
10.8
-13.2
230
280
280
5.5
13.2
-10.8
1000
750
750
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.5V to +5.5V, V
DD
= +10.8V to +13.2V, V
SS
= -10.8V to -13.2V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25°C.)
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,
|
t
PLHT
- t
PHLT
|
t
PLHT
t
PHLT
t
SKT
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ,
C
L
= 1000pF, T
A
= +25°C
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ,
C
L
= 1000pF, T
A
= +25°C
V
DD
= 12V, V
SS
= -12V, R
L
= 3kΩ,
C
L
= 1000pF, T
A
= +25°C
V
DD
= 12V, V
SS
= -12V,
R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V, Figure 3,
T
A
= +25°C
C
L
= 150pF to
2500pF
C
L
= 50pF to
1000pF
4
8
4
4
0.4
30
V/µs
30
4.0
4.0
0.4
120
kbps
C
L
= 50pF to
1000pF
230
µs
µs
µs
µs
µs
µs
IEC1000-4-2 (Contact Discharge)
IEC1000-4-2 (Air-Gap Discharge)
±15
±8
±15
kV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3186
Transition Output Slew Rate
SR
Receiver Output
Propagation Delay, Low to High
Receiver Output
Propagation Delay, High to Low
Receiver Propagation Delay
Skew,
|
t
PLHR
- t
PHLR
|
t
PLHR
t
PHLR
t
SKR
V
CC
= 5V, C
L
= 50pF, T
A
= +25°C
V
CC
= 5V, C
L
= 50pF, T
A
= +25°C
V
CC
= 5V, C
L
= 50pF, T
A
= +25°C
V
CC
= 5V, V
DD
= 12V,
V
SS
= -12V,
R
L
= 3kΩ to 7kΩ,
T
A
= +25°C
C
L
= 50pF to
2500pF
Guaranteed Data Rate
DR
_______________________________________________________________________________________
3
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
MAX3186
__________________________________________Typical Operating Characteristics
(V
CC
= +5.0V, V
DD
= +12.0V, V
SS
= -12.0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3186-TOC01
SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3186-TOC02
SLEW RATE
vs. LOAD CAPACITANCE
14
12
SLEW RATE (V/µs)
10
8
6
4
2
0
5000
0
1 TRANSMITTER 240kbps
4 TRANSMITTERS 15kbps
3kΩ + C
L
LOAD
FALL
MAX3186-TOC03
25
20
SUPPLY CUREENT (mA)
15
10
5
0
-5
-10
-15
-20
I
DD
, 240kbps
I
DD
, 120kbps
I
DD
, 20kbps
I
CC
1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
3kΩ + 2500pF LOAD
25
20
15
SUPPLY CUREENT (mA)
10
5
0
-5
-10
-15
-20
-25
I
CC
I
DD
, 240kbps
I
DD
, 120kbps
I
DD
, 20kbps
1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
3kΩ + C
L
LOAD
16
RISE
I
SS
, 20kbps
I
SS
, 120kbps
I
SS
, 240kbps
I
SS
, 20kbps
I
SS
, 120kbps
I
SS
, 240kbps
-25
10.80
11.40
12.0
12.6
13.2
0
SUPPLY VOLTAGE (V)
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3186-TOC04
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CURRENT PER TRANSMITTER
MAX3186-TOC05
SLEW RATE
vs. TEMPERATURE
MAX3186-TOC06
12.5
TRANSMITTER OUTPUT VOLTAGE (V)
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
0
120kbps
240kbps
1 TRANSMITTER AT DATA RATE
4 TRANSMITTERS AT DATA RATE / 16
3kΩ + C
L
LOAD
15
10
VOUT+
SLEW RATE (V/µs)
5
T1
25
20
SLEW RATE (V/µs)
FALL, 500pF
RISE, 500pF
10
RISE, 2000pF
15
0
-5
-10
-15
V
CC
V
OUT+
T2
VOUT-
T3
240kbps
120kbps
V
OUT-
5
0
0
2
4
6
8
10
12
14
16
18
-55 -35 -15
5
FALL, 2000pF
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
25 45
65 85 105 125
LOAD CURRENT PER TRANSMITTER (pF)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
______________________________________________________________Pin Description
PIN
1
2, 4, 7, 8, 9
3, 5, 6
10
11
12, 13, 14, 17, 19
15, 16, 18
20
NAME
V
DD
T1OUT–T5OUT
R1IN, R2IN, R3IN
V
SS
GND
T5IN–T1IN
R3OUT, R2OUT, R1OUT
V
CC
FUNCTION
Supply-Voltage Input, +10.8V to +13.2V
Transmitter Outputs, swing between V
DD
and V
SS
Receiver Inputs
Supply-Voltage Input, -10.8V to -13.2V
Ground. Connect to system ground.
Transmitter Inputs
Receiver Outputs, swing between GND and V
CC
Supply-Voltage Input, +4.5V to +5.5V
MAX3186
_______________Detailed Description
±15kV ESD Protection
R
C
50M to 100M
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
R
D
330Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
Cs
150pF
STORAGE
CAPACITOR
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)
Figure 1a. IEC1000-4-2 ESD Test Model
I
100%
90%
I
PEAK
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%
t
r
= 0.7ns to 1ns
30ns
60ns
t
Figure 1b. IEC1000-4-2 ESD Generator Current Waveform
_______________________________________________________________________________________
5
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