19-1471; Rev 5; 9/02
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
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
o
o
o
o
o
o
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
±4kV Fast Transient Burst Immunity per
IEC 1000-4-4
Low 50µA Standby Current
Operates with Either +3V or +5V Logic
Guaranteed Mouse Driveability
Small 0.1µF Capacitors
Flow-Through Pinout
Ordering Information
PART
TEMP RANGE
MAX3209ECUU
0°C to +70°C
38 TSSOP
MAX3209EEUU
-40°C to +85°C
38 TSSOP
MAX3209EEGL
-40°C to +85°C
6 ✕ 6 40 QFN
R5OUT
R3OUT
R2OUT
R1IN
R2IN
R3IN
40 39 38 37 36 35 34 33 32 31
R4IN
Instruments
R5IN
Motherboards
R1OUT
TOP VIEW
R4OUT
Pin Configurations
________________________Applications
Desktop PCs
PIN-PACKAGE
Equipment Requiring IEC 1000-4-2 Compliance
1
30 T3OUT
T2IN
2
29 T2OUT
T1IN
3
28 T1OUT
4
27 V-
VDD
5
C+
6
T4IN
7
24 T4OUT
T5IN
8
23 T5OUT
T6IN
9
22 T6OUT
N.C.
Network Servers
T3IN
VSTBY
Telecommunications
10
21 N.C.
26 C-
MAX3209E
25 GND
Typical Operating Circuit appears at end of data sheet.
LapLink is a trademark of Traveling Software.
R6IN
R7IN
R8IN
R9IN
R10IN
R10OUT
R9OUT
R8OUT
R6OUT
11 12 13 14 15 16 17 18 19 20
R7OUT
Pin Configurations continued at end of data sheet.
6 X 6 QFN
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX3209E
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 single 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 operates 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 equipment. In addition, the MAX3209E withstands ±4kV per
IEC 1000-4-4 Electrical Fast Transient/Burst Stressing.
As a result of its robust charge-pump structure, the
MAX3209E guarantees mouse driveability and true RS232 operation at data rates up to 460kbps, ensuring
compatibility with PC-to-PC communication software
(such as LapLink™).
