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________________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 ±15kV using IEC 1000-4-2 Air-
Gap Discharge, ±8kV using IEC 1000-4-2 Contact Dis-
charge, and ±15kV using the Human Body Model. The
MAX3237E’s logic and receiver I/O pins are protected to
the above standards, while the transmitter output pins are
protected to ±15kV using the Human Body Model.
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 0.1µF 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™ operating mode while main-
taining RS-232-compliant output levels.
The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1µA 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 1µA 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 subnotebook com-
puters. 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 cur-
rent of only 1µA (MAX3241E) or 10nA (MAX3237E). The
MAX3237E/MAX3241E have additional receiver outputs
that always remain active.
The MAX3222E and MAX3232E are available in space-
saving SO, SSOP, and TSSOP packages. The MAX3241E
is available in SO and SSOP packages. The MAX3237E is
available in an SSOP package.
________________________Applications
Notebooks, Subnotebooks, Smart Phones
and Palmtop Computers
XDSL Modems
Battery-Powered Equipment Printers
Cell-Phone Data Cables Cell Phones
____________________________Features
♦ ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3241E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ ESD Protection for All Logic and Receiver I/O
Pins (MAX3237E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ ESD Protection for Transmitter Output Pins
(MAX3237E)
±15kV—Human Body Model
♦ Guaranteed Data Rate
250kbps (MAX3222E/MAX3232E/MAX3241E
and MAX3237E, normal operation)
1Mbps (MAX3237E, MegaBaud operation)
♦ Latchup Free
♦ Low-Power Shutdown with Receivers Active
1µA (MAX3222E/MAX3241E)
10nA (MAX3237E)
♦ Flow-Through Pinout (MAX3237E)
♦ Guaranteed Mouse Driveability (MAX3241E)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
________________________________________________________________ Maxim Integrated Products 1
19-1298; Rev 3a; 1/00
_______________Ordering Information
Ordering Information continued at end of data sheet.
___________________________Selector Guide
Typical Operating Circuits appear at end of data sheet.
Pin Configurations appear at end of data sheet.
†
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.
MegaBaud is a trademark of Maxim Integrated Products.
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
PART
MAX3222E
MAX3232E
MAX3237E
(Normal)
MAX3237E
(MegaBaud)
MAX3241E 3/5
5/3
5/3
2/2
2/2
NO. OF
DRIVERS/
RECEIVERS
LOW-
POWER
SHUTDOWN
✔
—
✔
✔
✔
250
1M
250
250
250
GUARANTEED
DATA RATE
(kbps)
MAX3222ECAP
MAX3222ECUP
PART TEMP. RANGE
0°C to +70°C
0°C to +70°C 20 SSOP
20 TSSOP
PIN-PACKAGE
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V 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 2)
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.
V
CC
to GND..............................................................-0.3V to +6V
V+ to GND (Note 1) ..................................................-0.3V to +7V
V- to GND (Note 1) ...................................................+0.3V to -7V
V+ + |V-| (Note 1) .................................................................+13V
Input Voltages
T_IN, EN, SHDN, MBAUD to GND ........................-0.3V to +6V
R_IN to GND .....................................................................±25V
Output Voltages
T_OUT to GND...............................................................±13.2V
R_OUT, R_OUTB (MAX3241E)................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW
20-Pin TSSOP (derate 7.0mW/°C above +70°C) ..........559mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
Operating Temperature Ranges
MAX32_ _EC_ _ ...................................................0°C to +70°C
MAX32_ _EE_ _.................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 3.3V
V
CC
= 5.0V
SHDN = V
CC
, no load
T_IN, EN, SHDN
T
A
= +25°C
I
OUT
= 1.6mA (MAX3222E/MAX3232E/MAX3241E)
R_OUT (MAX3222E/MAX3237E/MAX3241E), EN = V
CC
,
receivers disabled
µA
T_IN, EN, SHDN, MBAUD
T_IN, EN, SHDN, MBAUD
I
OUT
= -1.0mA
CONDITIONS
±0.01 ±1
Input Leakage Current
SHDN = GND
µA110
Shutdown Supply Current
V
0.8 1.5
Input Threshold Low
0.6 1.1
V-25 +25Input Voltage Range
V
V
CC
-V
CC
-
0.6 0.1
Output Voltage High
mA
0.3 1
Supply Current
V
0.4
Output Voltage Low
µA±0.05 ±10Output Leakage Current
V0.5Transmitter Input Hysteresis
V0.8Input Logic Low
2.0
V
2.4
Input Logic High
UNITSMIN TYP MAXPARAMETER
MAX3222E, MAX3232E,
MAX3241E
MAX3237E 0.5 2.0
SHDN = R_IN = GND, T_IN = GND or V
CC
(MAX3237E)
nA10 300
MAX3222E, MAX3232E,
MAX3241E
T_IN, SHDN, MBAUD
918MAX3237E (Note 3)
I
OUT
= 1.0mA (MAX3237E) 0.4
DC CHARACTERISTICS (V
CC
= +3.3V or +5.0V, T
A
= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
_______________________________________________________________________________________ 3
Note 2: MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–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–C4 =
0.33µF tested at 5.0V ±10%.
Note 3: 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 4: Transmitter skew is measured at the transmitter zero crosspoints.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V 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 2)
T
A
= +25°C
IEC 1000-4-2 Contact Discharge (except MAX3237E)
IEC 1000-4-2 Air-Gap Discharge (except MAX3237E)
Human Body Model
T
A
= +25°C
V
CC
= 0 or 3V to 5.5V, V
OUT
= ±12V, transmitters disabled
(MAX3222E/MAX3232E/MAX3241E)
T1IN = T2IN = GND, T3IN = V
CC
, T3OUT loaded with 3kΩ
to GND, T1OUT and T2OUT loaded with 2.5mA each
CONDITIONS
V0.5Input Hysteresis
V
1.5 2.4
Input Threshold High
±8
R_IN, T_OUT
±15
kV
±15
kΩ357Input Resistance
µA±25Output Leakage Current
V±5Transmitter Output Voltage
UNITSMIN TYP MAXPARAMETER
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E
(V
CC
= +3.0V 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 2)
V
CC
= 0, transmitter output = ±2V Ω300 50kOutput Resistance
TRANSMITTER OUTPUTS
mA±60Output Short-Circuit Current
2.0 2.4
All transmitter outputs loaded with 3kΩ to ground V±5 ±5.4Output Voltage Swing
V
CC
= 3.3V
V
CC
= 5.0V
MAX3237E
±8
T_IN, R_IN, R_OUT, EN, SHDN,
MBAUD
±15
kV
±15
RECEIVER INPUTS
MOUSE DRIVEABILITY (MAX3241E)
ESD PROTECTION
Human Body Model
IEC 1000-4-2 Air-Gap Discharge
IEC 1000-4-2 Contact Discharge
Transition-Region Slew Rate
430
V/µs
C
L
= 150pF to
2500pF
C
L
= 150pF to
1000pF
PARAMETER SYMBOL MIN TYP MAX UNITS
Receiver Skew
t
PHL
- t
PLH
50 ns
Transmitter Skew
t
PHL
- t
PLH
100 ns
Receiver Output Disable Time 200 ns
Receiver Output Enable Time 200 ns
630
Maximum Data Rate 250 kbps
t
PHL
0.15
Receiver Propagation Delay
t
PLH
0.15
µs
CONDITIONS
(Note 4)
Normal operation (except MAX3232E)
Normal operation (except MAX3232E)
V
CC
= 3.3V,
T
A
= +25°C,
R
L
= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
Receiver input to receiver output,
C
L
= 150pF
__________________________________________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.)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0 1000 2000 3000 4000 5000
MAX3222E/MAX3232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3237E toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
V
OUT+
V
OUT-
0
6
2
4
10
8
14
12
16
0 1000 2000 3000 4000 5000
MAX3222E/MAX3232E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
+SLEW
FOR DATA RATES UP TO 250kbps
-SLEW
0
25
20
15
5
10
35
30
40
45
0 20001000 3000 4000 5000
MAX3222E/MAX3232E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3237E toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS—MAX3237E
(V
CC
= +3.0V 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 2)
24 150
MBAUD =
V
CC
Transition-Region Slew Rate
V
CC
= 3.3V, R
L
= 3kΩ to
7kΩ, +3V to -3V or -3V to
+3V, T
A
= +25°C
MBAUD =
GND
C
L
= 150pF
to 1000pF
t
PLH
t
PHL
V/µs
630
Receiver Skew 50 ns
|
t
PHL
- t
PLH
|
Transmitter Skew
100 ns
| t
PHL
- t
PLH
|, MBAUD = V
CC
R_IN to R_OUT, C
L
= 150pF
Maximum Data Rate
1000
kbps
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
1000
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
PARAMETER MIN TYP MAX UNITS
Receiver Output Enable Time 2.6 µs
Receiver Propagation Delay
0.15
µs
250
0.15
100 ns
| t
PHL
- t
PLH
|, MBAUD = GND
Receiver Output Disable Time 2.4 µsNormal operation
CONDITIONS
Normal operation
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
430
C
L
= 150pF to 2500pF,
MBAUD = GND
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