19-1298; Rev 5; 3/02
卤15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
General Description
The MAX3222E/MAX3232E/MAX3237E/MAX3241E are
3V-powered EIA/TIA-232 and V.28/V.24 communications
interfaces with low power requirements, high data-rate
capabilities, and enhanced electrostatic discharge (ESD)
protection. All transmitter outputs and receiver inputs are
protected to 卤15kV using IEC 1000-4-2 Air-Gap
Discharge, 卤8kV using IEC 1000-4-2 Contact Discharge,
and 卤15kV using the Human Body Model. In addition, the
MAX3237E鈥檚 logic and receiver I/O pins are protected to
the above ESD standards.
The transceivers have a proprietary low-dropout transmit-
ter output stage, delivering true RS-232 performance from
a +3.0V to +5.5V supply with a dual charge pump. The
charge pump requires only four small 0.1碌F capacitors
for operation from a +3.3V supply. Each device is guaran-
teed to run at data rates of 250kbps while maintaining RS-
232 output levels. The MAX3237E is guaranteed to run at
data rates of 250kbps in the normal operating mode and
1Mbps in the MegaBaud鈩?operating mode while main-
taining RS-232-compliant output levels.
The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1碌A shutdown mode
that reduces power consumption and extends battery life
in portable systems. Its receivers can remain active in
shutdown mode, allowing external devices such as
modems to be monitored using only 1碌A supply current.
Both the MAX3222E and MAX3232E are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.
The MAX3241E is a complete serial port (three
drivers/five receivers) designed for notebook and sub-
notebook computers. The MAX3237E (five drivers/three
receivers) is ideal for peripheral applications that require
fast data transfer. Both devices feature a shutdown mode
in which all receivers can remain active while using a
supply current of only 1碌A (MAX3241E) or 10nA
(MAX3237E). The MAX3237E/MAX3241E have additional
receiver outputs that always remain active.
The MAX3222E, MAX3232E, and MAX3241E are avail-
able in space-saving SO, SSOP, and TSSOP packages.
The MAX3237E is available in an SSOP package.
Features
o
ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3237E/MAX3241E)
卤15kV鈥擧uman Body Model
卤8kV鈥擨EC 1000-4-2, Contact Discharge
卤15kV鈥擨EC 1000-4-2, Air-Gap Discharge
o
ESD Protection For All Logic and Receiver I/O
Pins (MAX3237E)
卤15kV鈥擧uman Body Model
卤8kV鈥擨EC 1000-4-2, Contact Discharge
卤15kV鈥擨EC 1000-4-2, Air-Gap Discharge
o
Guaranteed Data Rate
250kbps (MAX3222E/MAX3232E/MAX3241E
and MAX3237E, Normal Operation)
1Mbps (MAX3237E, MegaBaud Operation)
o
Latchup Free
o
Low-Power Shutdown with Receivers Active
1碌A (MAX3222E/MAX3241E)
10nA (MAX3237E)
o
Flow-Through Pinout (MAX3237E)
o
Guaranteed Mouse Driveability (MAX3241E)
o
Meets EIA/TIA-232 Specifications Down to 3.0V
MAX3222E/MAX3232E/MAX3237E/MAX3241E
鈥?/div>
_______________Ordering Information
PART
MAX3222ECUP
MAX3222ECAP
TEMP RANGE
0掳C to +70掳C
0掳C to +70掳C
PIN-PACKAGE
20 TSSOP
20 SSOP
Ordering Information continued at end of data sheet.
___________________________Selector Guide
PART
MAX3222E
MAX3232E
MAX3237E
(Normal)
MAX3237E
(MegaBaud)
MAX3241E
NO. OF
LOW-
DRIVERS/
POWER
RECEIVERS SHUTDOWN
2/2
2/2
5/3
5/3
3/5
鉁?/div>
鈥?/div>
鉁?/div>
鉁?/div>
鉁?/div>
GUARANTEED
DATA RATE
(kbps)
250
250
250
250
1M
________________________Applications
Battery-Powered Equipment
Cell Phones
Cell-Phone Data Cables
Notebook, Subnotebook,
and Palmtop Computers
Printers
Smart Phones
xDSL Modems
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
MegaBaud is a trademark of Maxim Integrated Products, Inc.
鈥?/div>
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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