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MAX3209E Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX3209E
Description  ±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX3209E Datasheet(HTML) 6 Page - Maxim Integrated Products

   
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±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
6
_______________________________________________________________________________________
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 IEC 1000-4-2.
Applications Information
R5 and R10 Active in Standby Mode
The MAX3209E is placed in standby mode when VDD is
not present, provided that VSTBY remains at +3V to
+5.5V. In standby mode, receivers R5 and R10 remain
active, consuming 100µA max while unloaded. Standby
mode allows activity to be sensed on the serial ports so
that main power can be restored by the power-man-
agement unit, as shown in Figure 4.
Layout Considerations
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 ground, so
be sure to minimize the ground-lead return path to the
power supply. A separate return path to the power sup-
ply is recommend. Trace widths should be greater than
40 mils. Bypass VDD and VSTBY with 0.1µF capacitors
as close to the part as possible to ensure maximum
ESD protection.
The MAX3209E is not sensitive to power-supply
sequencing, and therefore requires no external protec-
tion diodes.
Interconnection with 3V and 5V Logic
The MAX3209E can directly interface with various 3V
and 5V logic families, including ACT and HCT CMOS.
See Table 1 for more information on possible combina-
tions of interconnections.
Mouse Driveability
The MAX3209E has been specifically designed to
power serial mice while operating from low-voltage
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3209E successfully drove all serial
mice tested and met their respective current and volt-
age requirements.
Figure 4. MAX3209E in Standby Mode
POWER-MANAGEMENT UNIT
VSTBY
VDD
GND
R5
R10
R_
T_
ALL OTHER
RECEIVERS
INACTIVE
ALL TRANSMITTERS
INACTIVE
+12V
SUPER
I/O
MAX3209E
tR = 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform
SYSTEM POWER-
SUPPLY VOLTAGE
(V)
VSTBY
SUPPLY
VOLTAGE
(V)
3.3
3.3
COMPATIBILITY
Compatible with all
CMOS families.
5
5
Compatible with all
TTL and CMOS fami-
lies.
3.3
5
Compatible with ACT
and HCT CMOS, and
with AC, HC, or
CD4000 CMOS.
Table 1. Logic Family Compatibility with
Various Supply Voltages


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