19-1186; Rev 1; 10/98
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
_______________General Description
The MAX3187 complete, dual DTE RS-232 serial port
meets 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 MAX3187’s six RS-232 transmitters and ten RS-232
receivers require no charge pump. Guaranteed to run
at data rates up to 230kbps, the MAX3187 is optimized
for desktop PC and motherboard applications, and is
compatible with popular software for PC communica-
tions. Power-supply current is less than 1mA for I
DD
and I
SS
, and less than 3mA for I
CC
.
The MAX3187 is available in a space-saving 36-pin
SSOP package.
____________________________Features
o
Enhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
o
Latchup Free During an ESD Event
o
36-Pin SSOP Package
o
Guaranteed 230kbps Data Rate
o
Flow-Through Pinout
o
Two Complete DTE Serial Ports
o
6 RS-232 Drivers and 10 RS-232 Receivers
MAX3187
______________Ordering Information
PART
MAX3187CAX
MAX3187EAX
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
36 SSOP
36 SSOP
________________________Applications
Desktop PC
Motherboards
Instruments
Equipment Meeting IEC 1000-4-2
Typical Operating Circuit appears at end of data sheet.
____________________________________________________________Pin Configuration
R1OUT
R2OUT
R3OUT
T1IN
T2IN
R4OUT
T3IN
R5OUT
V
CC
1
2
3
4
5
6
7
8
9
36 R1IN
35 R2IN
34 R3IN
33 T1OUT
TOP VIEW
MAX3187
32 T2OUT
31 R4IN
30 T3OUT
29 R5IN
28 V
DD
27 GND
26 R6IN
25 R7IN
24 R8IN
23 T4OUT
22 T5OUT
21 R9IN
20 T6OUT
19 R10IN
V
SS
10
R6OUT 11
R7OUT 12
R8OUT 13
T4IN 14
T5IN 15
R90UT 16
T6IN 17
R10OUT 18
SSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 1-800-835-8769.
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
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)
SSOP (derate 11.76mW/°C above +70°C) ..................762mW
Operating Temperature Ranges
MAX3187CAX .....................................................0°C to +70°C
MAX3187EAX ..................................................-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 Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
RS-232 Input Resistance
Receiver Output Short-Circuit
Current
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
= 0, 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
750
370
370
5.5
13.2
-10.8
3000
1000
1000
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
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 1, 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
±7.5
V
µs
µs
µs
µs
µs
µs
IEC 1000-4-2 (Contact Discharge)
IEC 1000-4-2 (Air-Gap Discharge)
±15
±8
±15
kV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3187
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, any two
transmitters switching
C
L
= 50pF to
2500pF
Guaranteed Data Rate
DR
Mouse Driveability
T3OUT = -5mA, T1OUT = T2OUT = 5mA
_______________________________________________________________________________________
3
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
MAX3187
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V
DD
= +12V, V
SS
= -12V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3187/TOC-02
SUPPLY CURRENT
vs. LOAD CAPACITANCE
30
SUPPLY CURRENT (mA)
20
10
I
CC
I
DD
, 240kbps
I
DD
, 120kbps
I
DD
, 20kbps
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT DATA RATE/16
3kΩ + C
LOAD
I
SS
, 120kbps
I
SS
, 240kbps
MAX3187/TOC-01
SLEW RATE
vs. LOAD CAPACITANCE
14
12
SLEW RATE (V/µs)
10
8
6
4
2
0
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT DATA RATE/16
3kΩ + C
LOAD
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
FALL
RISE
MAX3187/TOC-03
40
I
DD
, 240kbps
40
16
30
I
DD
, 120kbps
SUPPLY CURRENT (mA)
20
I
DD
, 20kbps
10
I
CC
0
I
SS,
20kbps
V
CC
= 5V
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT DATA RATE/16
3kΩ + C
LOAD
0
-10
-20
-30
-40
I
SS
, 20kbps
-10
-20
-30
-40
10.8
11.4
I
SS,
120kbps
I
SS,
240kbps
12.0
12.6
13.2
0
1000
2000
3000
4000
5000
SUPPLY VOLTAGE (±V)
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
120kbps
240kbps
2 TRANSMITTER, 240kbps
4 TRANSMITTERS, 15kbps
3kΩ
+
C
LOAD
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
0
1000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
120kbps
240kbps
MAX3187/TOC-04
TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CURRENT PER TRANSMITTER
MAX3187/TOC-05
SLEW RATE
vs. TEMPERATURE
MAX3187/TOC-06
12.5
TRANSMITTER OUTPUT VOLTAGE (V)
15
TRANSMITTER OUTPUT VOLTAGE (V)
10
V
OUT+
5
T1
25
20
SLEW RATE (V/ms)
FALL, 500pF
RISE, 500pF
10
RISE, 2000pF
15
0
-5
-10
-15
0
2
V
CC
V
OUT+
T2
V
OUT-
T3
V
OUT-
5
0
4
6
8
10
12
14
16
18
-55 -35 -15
5
FALL, 2000pF
25
45
65
85 105 125
LOAD CURRENT PER TRANSMITTER (mA)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
______________________________________________________________Pin Description
PIN
1, 2, 3, 6, 8, 11,
12, 13, 16, 18
4, 5, 7, 14, 15, 17
9
10
27
28
19, 21, 24, 25, 26,
29, 31, 34, 35, 36
20, 22, 23, 30, 32, 33
NAME
R1OUT–R10OUT
T1IN–T6IN
V
CC
V
SS
GND
V
DD
R10IN–R1IN
T6OUT–T1OUT
FUNCTION
Receiver Outputs, swing between GND and V
CC
Transmitter Inputs
Supply-Voltage Input, 4.5V to 5.5V
Supply-Voltage Input, -10.8V to -13.2V
Ground. Connect system to ground.
Supply-Voltage Input, 10.8V to 13.2V
Receiver Inputs
Transmitter Outputs, swing between V
DD
and V
SS
MAX3187
_______________Detailed Description
3.0V
DRIVER
INPUT
0V
1.5V
t
PHL
t
PLH
V
OH
3.3V
3.0V
V
OUT
-3.0V
-3.3V
0V
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges (ESD) encountered during handling
and assembly. The MAX3187 driver outputs and receiv-
er 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 ±15kV ESD, without damage. After an ESD
event, the MAX3187 continues working without latchup.
ESD protection can be tested in several ways. The
transmitter outputs and receiver inputs are character-
ized 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)
t
F2
t
F1
t
R2
V
OL
t
R1
SIGNAL
GENERATOR
R
L
C
L
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Figure 1. Slew-Rate Test Circuit and Timing Diagram
_______________________________________________________________________________________
5
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