MAX3222/MAX3232/
MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
________________General Description
__Next Generation Device Features
The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output 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 0.1µF external chargepump 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™ operating mode, while maintaining RS-232
output levels.
The MAX3222/MAX3232 have 2 receivers and 2
drivers. The MAX3222 features a 1µA 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 1µA supply current. 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 1µA supply current. Receivers R1
(MAX3237/MAX3241) and R2 (MAX3241) have extra outFunctional Diagrams
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 biasing the protection diodes in circuitry that may have VCC
completely removed.
The MAX3222, MAX3237, and MAX3241 are available
in space-saving TSSOP and SSOP packages.
♦ For Smaller Packaging:
MAX3228E/MAX3229E: +2.5V to +5.5V RS-232
Transceivers in UCSP™
♦ For Integrated ESD Protection:
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: ±15kV ESD-Protected, Down to 10nA,
3.0V to 5.5V, Up to 1Mbps, True RS-232
Transceivers
♦ For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2 Tx/2 Rx RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
_______________Ordering Information
PIN-PACKAGE
PKG
CODE
0°C to +70°C
20 TSSOP
U20+2
MAX3222CAP+
0°C to +70°C
20 SSOP
A20+1
MAX3222CWN+
0°C to +70°C
18 SO
W18+1
MAX3222CPN+
0°C to +70°C
18 Plastic Dip
P18+5
PART
TEMP RANGE
MAX3222CUP+
+Denotes lead-free package.
Ordering Information continued at end of data sheet.
_________________Pin Configurations
TOP VIEW
+
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
High-Speed Modems
Battery-Powered Equipment
18 SHDN
17 VCC
C1+ 2
V+ 3
16 GND
C1- 4
MAX3222
15 T1OUT
C2+ 5
MAX3222
14 R1IN
C2-
Hand-Held Equipment
Peripherals
Printers
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.
*
6
13 R1OUT
V-
7
12 T1IN
T2OUT
8
11 T2IN
R2IN
9
10 R2OUT
DIP/SO
Pin Configurations continued at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0273; Rev 7; 1/07
*
EN 1
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN
Input Hysteresis
Input Resistance
TYP
MAX
UNITS
0.3
TA = +25°C
3
5
V
7
kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to ground
±5.0
±5.4
Output Resistance
VCC = V+ = V- = 0V, TOUT = ±2V
300
10M
Output Short-Circuit Current
Output Leakage Current
±35
V
Ω
mA
±25
VOUT = ±12V, VCC = 0V or 3V to 5.5V, transmitters
disabled
±60
µA
MOUSE DRIVEABILITY (MAX3241)
Transmitter Output Voltage
T1IN = T2IN = GND, T3IN = VCC,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with 2.5mA each
±5.0
V
TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241
(VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Maximum Data Rate
CONDITIONS
MIN
RL = 3kΩ, CL = 1000pF, one transmitter switching
TYP
120
235
tPHL
UNITS
kbps
0.3
tPLH
MAX
0.3
Receiver Propagation Delay
R_IN to R_OUT, CL = 150pF
Receiver Output Enable Time
Normal operation
200
ns
Receiver Output Disable Time Normal operation
200
ns
300
ns
300
ns
Transmitter Skew
Receiver Skew
Transition-Region Slew Rate
Maxim Integrated
| tPHL - tPLH |
| tPHL - tPLH |
VCC = 3.3V, RL = 3kΩ to 7kΩ,
+3V to -3V or -3V to +3V,
TA = +25°C, one transmitter
switching
µs
CL = 150pF to
1000pF
6
30
CL = 150pF to
2500pF
4
30
V/µs
3
