19-1298; Rev 11; 10/07
±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/
MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24
communications interface devices feature low power con-
sumption, high data-rate capabilities, and enhanced
electrostatic-discharge (ESD) protection. The enhanced
ESD structure protects all transmitter outputs and
receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap
Discharge, ±8kV using IEC 1000-4-2 Contact Discharge
(±9kV for MAX3246E), and ±15kV using the Human Body
Model. The logic and receiver I/O pins of the MAX3237E
are protected to the above standards, while the transmit-
ter output pins are protected to ±15kV using the Human
Body Model.
A proprietary low-dropout transmitter output stage delivers
true RS-232 performance from a +3.0V to +5.5V power
supply, using an internal dual charge pump. The charge
pump requires only four small 0.1µF capacitors for opera-
tion from a +3.3V supply. Each device guarantees opera-
tion at data rates of 250kbps while maintaining RS-232
output levels. The MAX3237E guarantees operation at
250kbps in the normal operating mode and 1Mbps in the
MegaBaud™ operating mode, while maintaining RS-232-
compliant output levels.
The MAX3222E/MAX3232E have two receivers and two
transmitters. The MAX3222E features a 1µA shutdown
mode that reduces power consumption in battery-pow-
ered portable systems. The MAX3222E receivers remain
active in shutdown mode, allowing monitoring of external
devices while consuming only 1µA of supply current. The
MAX3222E and MAX3232E are pin, package, and func-
tionally compatible with the industry-standard MAX242
and MAX232, respectively.
The MAX3241E/MAX3246E are complete serial ports
(three drivers/five receivers) designed for notebook and
subnotebook computers. The MAX3237E (five drivers/
three receivers) is ideal for peripheral applications that
require fast data transfer. These devices feature a shut-
down mode in which all receivers remain active, while
consuming only 1µA (MAX3241E/MAX3246E) or 10nA
(MAX3237E).
The MAX3222E, MAX3232E, and MAX3241E are avail-
able in space-saving SO, SSOP, TQFN and TSSOP pack-
ages. The MAX3237E is offered in an SSOP package.
The MAX3246E is offered in the ultra-small 6 x 6 UCSP™
package.
Next-Generation Device Features
♦
For Space-Constrained Applications
MAX3228E/MAX3229E: ±15kV ESD-Protected,
+2.5V to +5.5V, RS-232 Transceivers in UCSP
♦
For Low-Voltage or Data Cable Applications
MAX3380E/MAX3381E: +2.35V to +5.5V, 1μA,
2Tx/2Rx, RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
_______________Ordering Information
PART
PIN-
TEMP RANGE PACKAGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
20 Thin QFN-
EP** (5mm x
5mm)
20 TSSOP
20 SSOP
18 Wide SO
18 Plastic DIP
Dice*
20 Thin QFN-
EP** (5mm x
5mm)
20 TSSOP
20 SSOP
18 Wide SO
18 Plastic DIP
16 SSOP
16 Wide SO
16 Plastic DIP
PKG
CODE
T2055-5
—
—
—
—
—
T2055-5
—
—
—
—
—
—
—
MAX3222ECTP
MAX3222ECUP
MAX3222ECAP
MAX3222ECWN
MAX3222ECPN
MAX3222EC/D
MAX3222EETP
MAX3222EEUP
MAX3222EEAP
MAX3222EEWN
MAX3222EEPN
MAX3232ECAE
MAX3232ECWE
MAX3232ECPE
*Dice
are tested at T
A
= +25°C, DC parameters only.
**EP
= Exposed paddle.
Ordering Information continued at end of data sheet.
Pin Configurations, Selector Guide, and Typical Operating
Circuits appear at end of data sheet.
MegaBaud and UCSP are trademarks of Maxim Integrated
Products, Inc.
Applications
Battery-Powered Equipment
Cell Phones
Cell-Phone Data Cables
Notebook, Subnotebook,
and Palmtop Computers
Printers
Smart Phones
xDSL Modems
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW
V+ to GND (Note 1) ..................................................-0.3V to +7V
20-Pin TQFN (derate 21.3mW/°C above +70°C) ........1702mW
V- to GND (Note 1) ...................................................+0.3V to -7V
20-Pin TSSOP (derate 10.9mW/°C above +70°C) ........879mW
V+ + |V-| (Note 1).................................................................+13V
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
Input Voltages
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
T_IN,
EN, SHDN,
MBAUD to GND ........................-0.3V to +6V
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
R_IN to GND .....................................................................±25V
28-Pin TSSOP (derate 12.8mW/°C above +70°C) ......1026mW
Output Voltages
32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW
T_OUT to GND...............................................................±13.2V
6 x 6 UCSP (derate 12.6mW/°C above +70°C) .............1010mW
R_OUT, R_OUTB (MAX3241E)................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Ranges
Short-Circuit Duration, T_OUT to GND.......................Continuous
MAX32_ _EC_ _ ...................................................0°C to +70°C
Continuous Power Dissipation (T
A
= +70°C)
MAX32_ _EE_ _.................................................-40°C to +85°C
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
Storage Temperature Range .............................-65°C to +150°C
16-Pin TSSOP (derate 9.4mW/°C above +70°C) .......754.7mW
Lead Temperature (soldering, 10s) .................................+300°C
16-Pin TQFN (derate 20.8mW/°C above +70°C) .....1666.7mW
Bump Reflow Temperature (Note 2)
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
Infrared, 15s..................................................................+200°C
18-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
Vapor Phase, 20s..........................................................+215°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Note 2:
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 3, 4)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
(V
CC
= +3.3V or +5V, T
A
= +25°C)
Supply Current
SHDN
= V
CC
, no load
SHDN
= GND
SHDN
= R_IN = GND, T_IN = GND or V
CC
(MAX3237E)
T_IN,
EN, SHDN,
MBAUD
T_IN,
EN, SHDN,
MBAUD
V
CC
= +3.3V
V
CC
= +5.0V
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Output-Voltage Low
R_OUT (MAX3222E/MAX3237E/MAX3241E/
MAX3246E),
EN
= V
CC
, receivers disabled
I
OUT
= 1.6mA (MAX3222E/MAX3232E/MAX3241E/
MAX3246E), I
OUT
= 1.0mA (MAX3237E)
±0.05
±10
0.4
µA
V
T_IN,
EN, SHDN
T_IN,
SHDN,
MBAUD
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
MAX3237E (Note 5)
2.0
V
2.4
0.5
±0.01
9
±1
18
V
µA
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
MAX3237E
Shutdown Supply Current
LOGIC INPUTS
Input Logic Low
Input Logic High
0.8
V
0.3
0.5
1
10
1
2.0
10
300
µA
nA
mA
2
_______________________________________________________________________________________
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 3, 4)
PARAMETER
Output-Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
V
CC
= 0 or +3.0V to +5.5V, V
OUT
= ±12V, transmitters
disabled (MAX3222E/MAX3232E/MAX3241E/MAX3246E)
All transmitter outputs loaded with 3kΩ to ground
(Note 6)
V
CC
= 0, transmitter output = ±2V
±5
300
±5.4
50k
±60
±25
V
Ω
mA
µA
T
A
= +25°C
3
T
A
= +25°C
T
A
= +25°C
V
CC
= +3.3V
V
CC
= +5.0V
V
CC
= +3.3V
V
CC
= +5.0V
-25
0.6
0.8
1.1
1.5
1.5
2.0
0.5
5
7
2.4
2.4
+25
V
V
V
V
kΩ
I
OUT
= -1.0mA
CONDITIONS
MIN
V
CC
-
0.6
TYP
V
CC
-
0.1
MAX
UNITS
V
MOUSE DRIVABILITY
(MAX3241E)
T1IN = T2IN = GND, T3IN = V
CC
, T3OUT loaded with
Transmitter Output Voltage
3kΩ to GND, T1OUT and T2OUT loaded with 2.5mA
each
ESD PROTECTION
Human Body Model
R_IN, T_OUT
IEC 1000-4-2 Air-Gap Discharge (except MAX3237E)
IEC 1000-4-2 Contact Discharge (except MAX3237E)
IEC 1000-4-2 Contact Discharge (MAX3246E only)
T_IN, R_IN, R_OUT,
EN, SHDN,
MBAUD
Human Body Model
MAX3237E
IEC 1000-4-2 Air-Gap Discharge
IEC 1000-4-2 Contact Discharge
±5
V
±15
±15
±8
±9
±15
±15
±8
kV
kV
_______________________________________________________________________________________
3
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 3, 4)
PARAMETER
SYMBOL
CONDITIONS
R
L
= 3kΩ,
C
L
= 1000pF,
one transmitter
switching
t
PHL
t
PLH
T
A
= T
MIN
to T
MAX
(MAX3222E/MAX3232E/
MAX3241E) (Note 6)
T
A
= +25°C (MAX3246E)
MIN
250
250
0.15
0.15
200
200
100
50
V
CC
= +3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ, measured
from +3.0V to -3.0V or -3.0V to
+3.0V, one transmitter switching
C
L
= 150pF
to 1000pF
µs
ns
ns
ns
ns
TYP
MAX
UNITS
Maximum Data Rate
kbps
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
Receiver input to receiver output,
C
L
= 150pF
Normal operation (except MAX3232E)
Normal operation (except MAX3232E)
|t
PHL
- t
PLH
|
|t
PHL
- t
PLH
|
(Note 7)
Transition-Region Slew Rate
6
30
V/µs
TIMING CHARACTERISTICS—MAX3237E
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
Maximum Data Rate
V
CC
= +3.0V to +4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
V
CC
= +4.5V to +5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew (Note 7)
Receiver Skew
R_IN to R_OUT, C
L
= 150pF
Normal operation
Normal operation
| t
PHL
- t
PLH
|, MBAUD = GND
| t
PHL
- t
PLH
|, MBAUD = V
CC
| t
PHL
- t
PLH
|
V
CC
= +3.3V,
R
L
= 3kΩ to 7kΩ,
+3.0V to -3.0V or
-3.0V to +3.0V,
T
A
= +25°C
C
L
= 150pF
to 1000pF
MBAUD = GND
MBAUD = V
CC
6
24
t
PHL
t
PLH
MIN
250
1000
1000
0.15
0.15
2.6
2.4
100
50
30
150
V/µs
µs
µs
µs
ns
ns
kbps
TYP
MAX
UNITS
Transition-Region Slew Rate
C
L
= 150pF to 2500pF,
4
30
MBAUD = GND
Note 3:
MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 = 0.33µF tested at +5.0V
±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =
0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at
5.0V ±10%.
Note 4:
MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.
Note 5:
The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at
the supply rails.
Note 6:
MAX3241EEUI is specified at T
A
= +25°C.
Note 7:
Transmitter skew is measured at the transmitter zero crosspoints.
4 _______________________________________________________________________________________
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3222E/MAX3232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3237E toc01
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
MAX3222E/MAX3232E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc02
MAX3222E/MAX3232E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
40
SUPPLY CURRENT (mA)
35
250kbps
30
25
20
15
10
20kbps
120kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
MAX3237E toc03
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
16
14
12
SLEW RATE (V/μs)
10
8
6
4
+SLEW
-SLEW
45
V
OUT+
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
V
OUT-
2
FOR DATA RATES UP TO 250kbps
0
5
0
4000
5000
0
1000
2000
3000
4000
5000
1000
2000
3000
4000
5000
0
1000
2000
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
MAX3237E to04
MAX3241E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc05
MAX3241E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
250kbps
40
30
20kbps
20
10
0
120kbps
MAX3237E toc06
14
12
SLEW RATE (V/μs)
10
8
6
4
60
50
SUPPLY CURRENT (mA)
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT-
4000
5000
2
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
TRANSMITTER OUTPUT VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
500
1000
1500
2000
2500
3000
LOAD CAPACITANCE (pF)
V
OUT+
FOR DATA RATES UP TO 250kbps
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C
L
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
MAX3237E toc07
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3246E toc07A
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
CC
)
1Mbps
TRANSMITTER OUTPUT VOLTAGE (V)
5.0
2.5
0
-2.5
-5.0
-7.5
2Mbps
1.5Mbps
1Mbps
3000
0
500
1000
1500
2000
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD, EACH OUTPUT
2Mbps
1.5Mbps
MAX3237E toc08
7.5
V
OUT
+
FOR DATA RATES UP TO 250kbps
1 TRANSMITTER 250kbps
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C
L
V
OUT-
V
OUT-
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
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