19-0273; Rev 5; 3/99
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1碌F External Capacitors
MAX3222/MAX3232/MAX3237/MAX3241*
_______________General Description
The MAX3222/MAX3232/MAX3237/MAX3241 trans-
ceivers have a proprietary low-dropout transmitter out-
put stage enabling true RS-232 performance from a
3.0V to 5.5V supply with a dual charge pump. The
devices require only four small 0.1碌F external charge-
pump capacitors. The MAX3222, MAX3232, and
MAX3241 are guaranteed to run at data rates of
120kbps while maintaining RS-232 output levels. The
MAX3237 is guaranteed to run at data rates of 250kbps
in the normal operating mode and 1Mbps in the
MegaBaud鈩?operating mode, while maintaining RS-232
output levels.
The MAX3222/MAX3232 have 2 receivers and 2
drivers. The MAX3222 features a 1碌A shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers remain active in
shutdown mode, allowing external devices such as
modems to be monitored using only 1碌A supply cur-
rent. The MAX3222 and MAX3232 are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.
The MAX3241 is a complete serial port (3 drivers/
5 receivers) designed for notebook and subnotebook
computers. The MAX3237 (5 drivers/3 receivers) is ideal
for fast modem applications. Both these devices feature
a shutdown mode in which all receivers can remain
active while using only 1碌A supply current. Receivers R1
(MAX3237/MAX3241) and R2 (MAX3241) have extra out-
puts in addition to their standard outputs. These extra
outputs are always active, allowing external devices
such as a modem to be monitored without forward bias-
ing the protection diodes in circuitry that may have V
CC
completely removed.
The MAX3222, MAX3237, and MAX3241 are available
in space-saving TSSOP and SSOP packages.
____________________________Features
o
Low Supply Current:
300碌A (MAX3222/MAX3232/MAX3241)
500碌A (MAX3237)
o
Guaranteed Data Rate:
120kbps (MAX3222/MAX3232/MAX3241)
250kbps (MAX3237鈥擭ormal Operation)
1Mbps (MAX3237鈥擬egaBaud Operation)
o
1碌A Low-Power Shutdown with Receivers Active
(MAX3222/MAX3237/MAX3241)
o
Flow-Through Pinout (MAX3237)
o
Meets EIA/TIA-232 Specifications Down to 3.0V
o
Guaranteed Mouse Driveability (MAX3241)
o
Pin Compatible with Industry-Standard MAX232
(MAX3232)
Pin Compatible with Industry-Standard MAX242
(MAX3222)
o
Guaranteed Slew Rate:
6V/碌s (MAX3222/MAX3232/MAX3237/MAX3241)
24V/碌s (MAX3237鈥擬egaBaud Operation)
______________Ordering Information
PART
MAX3222CUP
MAX3222CAP
MAX3222CWN
MAX3222CPN
TEMP. RANGE
0掳C to +70掳C
0掳C to +70掳C
0掳C to +70掳C
0掳C to +70掳C
PIN-PACKAGE
20 TSSOP
20 SSOP
18 SO
18 Plastic DIP
Ordering Information continued at end of data sheet.
_________________Pin Configurations
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2-
V-
T2OUT
R2IN
6
7
8
9
18 SHDN
17 V
CC
16 GND
15 T1OUT
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
High-Speed Modems
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
Typical Operating Circuits appear at end of data sheet.
MAX3222
14 R1IN
13 R1OUT
12 T1IN
11 T2IN
10 R2OUT
DIP/SO
Pin Configurations continued at end of data sheet.
MegaBaud is a trademark of Maxim Integrated Products.
*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 free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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