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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 sin-
gle 38-pin TSSOP package.
The MAX3209E features a 50µA low-power standby
mode for compliance with system power-management
requirements. During standby, while the device oper-
ates 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 equip-
ment. 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 LapLink
™
).
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 50µA Standby Current
o
Operates with Either +3V or +5V Logic
o
Guaranteed Mouse Driveability
o
Small 0.1µF 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
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
38 TSSOP
38 TSSOP
R2OUT
R1OUT
T3IN
T2IN
T1IN
MAX3209E
33 T3OUT
32 T2OUT
31 T1OUT
30 V-
29 C1-
28 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.
V
STBY
V
DD
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
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, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
MAX3209E
ABSOLUTE MAXIMUM RATINGS
V
DD
.........................................................................-0.3V to +15V
V
STBY
....................................................................... -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 (V
STBY
+ 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)
TSSOP (derate 11.8mW/°C above +70°C) ..................941mW
Operating Temperature Ranges
MAX3209EC_ _ ...................................................0°C to +70°C
MAX3209EE_ _ ................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°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
DD
= +10.8V to +13.2V, V
STBY
= +3V to +5.5V, C1 = C2 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C, V
DD
= +12V, V
STBY
= +3.3V.)
PARAMETER
DC CHARACTERISTICS
Operating Voltage Range
V
DD
STBY
I
DD
Supply Current
I
STBY
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
T
A
= +25°C
T
A
= +25°C
V
STBY
= 3.3V
T
A
= +25°C
2.4
0.2
3
5
1
7
-25
25
0.4
V
V
V
V
kΩ
All transmitter outputs loaded with 3kΩ to GND
V
T_OUT
= 0
V
DD
= V
STBY
= 0, V
OUT
= ±2V
300
±5.0
±10
±60
V
mA
Ω
V
OLR
V
OHR
R_OUT; I
SINK
= 1.6mA
R_OUT
V
DD
= 0, V
STBY
= 5V
I
SOURCE
= 40µA
I
SOURCE
= 1mA
V
STBY
- 0.3
V
STBY
- 0.6
0.05
±5
0.4
V
V
µA
V
ILT
V
IHT
T_IN
T_IN
Transmitter input at GND
2
25
0.8
V
V
µA
V
DD
= +12V, no load, all transmitter inputs at
V
STBY
, all receiver inputs at V
STBY
or uncon-
nected
V
DD
= 0, V
STBY
= +3.3V, no load, all transmit-
ter inputs at V
STBY
, all receiver inputs at V
STBY
or unconnected
10.8
3
0.5
13.2
5.5
1
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
mA
50
100
µA
_______________________________________________________________________________________
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +10.8V to +13.2V, V
STBY
= +3V to +5.5V, C1 = C2 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C, V
DD
= +12V, V
STBY
= +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
R
L
= 3kΩ to 7kΩ, C
L
= 50pF to 1000pF,
two transmitters switching
T1IN = T2IN = GND, T3IN = V
CC,
T3OUT loaded with 3kΩ to GND, T1OUT and
T2OUT loaded with 2.5mA each
t
PLHT
t
PHLT
C
L
= 1000pF
C
L
= 1000pF
R
L
= 3kΩ to 7kΩ, V
STBY
= 3.3V,
C
L
= 50pF to 1000pF, T
A
= +25°C,
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
µs
µs
SR
6
12
30
V/µs
RECEIVER TIMING CHARACTERISTICS
Receiver Output Propagation
Delay, Low to High
Receiver Output Propagation
Delay, High to Low
t
PLHR
t
PHLR
C
L
= 150pF
C
L
= 150pF
0.4
0.4
1
1
µs
µs
Typical Operating Characteristics
(V
STBY
= +5V, V
DD
= +12V, C1 = C2 = 0.1µF, T
A
= +25°C, 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 = 0.1µF
2 TRANSMITTERS AT DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS AT 3kΩ + 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
3kΩ + C
L
0
1000
2000
3000
4000
5000
5
10.8
13.2
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
3
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
MAX3209E
Typical Operating Characteristics (continued)
(V
STBY
= +5V, V
DD
= +12V, C1 = C2 = 0.1µF, T
A
= +25°C, 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
I
SOURCE
(mA)
20
25
30
I
SINK
(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
V
STBY
V
DD
C1+
R_IN
T_OUT
GND
C1-
V-
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
t
PHL
t
PLH
V
OH
3.3V
3.0V
V
OUT
-3.0V
-3.3V
0V
t
F2
t
F1
t
R2
V
OL
t
R1
SIGNAL
GENERATOR
R
L
C
L
Figure 1. Slew-Rate Test Circuit and Timing Diagram
4
_______________________________________________________________________________________
±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 electro-
static 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 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)
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.
R
C
1M
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
R
D
1500Ω
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.
I
P
100%
90%
AMPERES
36.8%
10%
0
0
t
RL
TIME
t
DL
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 dis-
charged 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
1.5kΩ 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 specifica-
tion. 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 ESD-
protection 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 gen-
erally 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
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
Figure 3a. IEC 1000-4-2 ESD Test Model
_______________________________________________________________________________________
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