MAX3241EEAI [MAXIM]
LINE TRANSCEIVER|CMOS|3 DRIVER|5 RCVR|SSOP|28PIN|PLASTIC ; 线收发器| CMOS | 3驱动器| 5 RCVR | SSOP | 28PIN |塑料\n
| 型号： | MAX3241EEAI |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | LINE TRANSCEIVER|CMOS|3 DRIVER|5 RCVR|SSOP|28PIN|PLASTIC
|
| 文件： | 总19页 (文件大小：371K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1298; Rev 5; 3/02
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
General Description
Features
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 1ꢀ5V using IEꢁ 1ꢂꢂꢂ-4-2 Air-ꢃap
Discharge, 85V using IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact Discharge,
and 1ꢀ5V using the ꢄuman ꢅodꢆ Model. In addition, the
MAX3237E’s logic and receiver I/O pins are protected to
the above ESD standards.
o ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3237E/MAX3241E)
15kV—Human Body Model
8kV—IEC 1000-4-2, Contact Discharge
15kV—IEC 1000-4-2, Air-Gap Discharge
o 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
The transceivers have a proprietarꢆ low-dropout transmit-
ter output stage, delivering true RS-232 performance from
a +3.ꢂV to +ꢀ.ꢀV supplꢆ with a dual charge pump. The
charge pump requires onlꢆ four small ꢂ.1µF capacitors
for operation from a +3.3V supplꢆ. Each device is guaran-
teed to run at data rates of 2ꢀꢂ5bps while maintaining RS-
232 output levels. The MAX3237E is guaranteed to run at
data rates of 2ꢀꢂ5bps in the normal operating mode and
1Mbps in the Megaꢅaud™ operating mode while main-
taining RS-232-compliant output levels.
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
1µA (MAX3222E/MAX3241E)
10nA (MAX3237E)
The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1µA shutdown mode
that reduces power consumption and extends batterꢆ life
in portable sꢆstems. Its receivers can remain active in
shutdown mode, allowing external devices such as
modems to be monitored using onlꢆ 1µA supplꢆ current.
ꢅoth the MAX3222E and MAX3232E are pin, pac5age,
and functionallꢆ compatible with the industrꢆ-standard
MAX242 and MAX232, respectivelꢆ.
The MAX3241E is a complete serial port (three
drivers/five receivers) designed for noteboo5 and sub-
noteboo5 computers. The MAX3237E (five drivers/three
receivers) is ideal for peripheral applications that require
fast data transfer. ꢅoth devices feature a shutdown mode
in which all receivers can remain active while using a
supplꢆ current of onlꢆ 1µA (MAX3241E) or 1ꢂnA
(MAX3237E). The MAX3237E/MAX3241E have additional
receiver outputs that alwaꢆs remain active.
o Flow-Through Pinout (MAX3237E)
o Guaranteed Mouse Driveability (MAX3241E)
o Meets EIA/TIA-232 Specifications Down to 3.0V
_______________Ordering Information
PART
TEMP RANGE
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
PIN-PACKAGE
MAX3222EꢁUP
MAX3222EꢁAP
2ꢂ TSSOP
2ꢂ SSOP
Ordering Information continued at end of data sheet.
___________________________ꢁelector Guide
NO. OF
LOW-
POWER
GUARANTEED
DATA RATE
(kbps)
The MAX3222E, MAX3232E, and MAX3241E are avail-
able in space-saving SO, SSOP, and TSSOP pac5ages.
The MAX3237E is available in an SSOP pac5age.
PART
DRIVERS/
RECEIVERS SHUTDOWN
MAX3222E
MAX3232E
2/2
2/2
✔
250
250
________________________Applications
ꢅatterꢆ-Powered Equipment Printers
—
MAX3237E
(Normal)
5/3
✔
250
ꢁell Phones
Smart Phones
xDSL Modems
ꢁell-Phone Data ꢁables
MAX3237E
(MegaBaud)
5/3
3/5
✔
✔
250
1M
Noteboo5, Subnoteboo5,
and Palmtop ꢁomputers
MAX3241E
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.
†
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’s website at www.maxim-ic.com.
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND..............................................................-0.3V to +6V
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 10.9mW/°C above +70°C) ........879mW
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
28-Pin TSSOP (derate 12.8mW/°C above +70°C) ......1026mW
32-pin QFN (derate 23.2mW/°C above +70°C).............1860mW
Operating Temperature Ranges
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
Short-Circuit Duration, T_OUT to GND.......................Continuous
+ 0.3V)
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
CC
Continuous Power Dissipation (T = +70°C)
A
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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
= +3.0V to +5.5V, C1–C4 = 0.1µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
CC
A
MIN
PARAMETER
CONDITIONS
= +3.3V or +5.0V, T = +25°C)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
CC
A
MAX3222E, MAX3232E,
MAX3241E
0.3
1
Supply Current
SHDN = V , no load
mA
CC
MAX3237E
0.5
1
2.0
10
SHDN = GND
µA
nA
Shutdown Supply Current
SHDN = R_IN = GND, T_IN = GND or V
(MAX3237E)
10
300
CC
LOGIC INPUTS
Input Logic Low
T_IN, EN, SHDN, MBAUD
0.8
V
V
V
V
V
= 3.3V
2.0
2.4
CC
CC
Input Logic High
T_IN, EN, SHDN, MBAUD
= 5.0V
Transmitter Input Hysteresis
0.5
MAX3222E, MAX3232E,
MAX3241E
T_IN, EN, SHDN
0.01
1
Input Leakage Current
µA
T_IN, SHDN, MBAUD
MAX3237E (Note 3)
9
18
RECEIVER OUTPUTS
R_OUT (MAX3222E/MAX3237E/MAX3241E), EN = V
receivers disabled
,
CC
Output Leakage Current
0.05
10
µA
V
I
I
= 1.6mA (MAX322E/MAX3232E/MAX3241E)
= 1.0mA (MAX3237E)
OUT
OUT
Output Voltage Low
Output Voltage High
0.4
V
0.6
-
V
-
CC
CC
I
= -1.0mA
V
OUT
0.1
RECEIVER INPUTS
Input Voltage Range
-25
+25
V
2
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V
= +3.0V to +5.5V, C1–C4 = 0.1µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
CC
A
MIN
PARAMETER
CONDITIONS
MIN
0.6
TYP
1.1
1.5
1.5
2.0
0.5
5
MAX
UNITS
V
V
V
V
= 3.3V
= 5.0V
= 3.3V
= 5.0V
CC
CC
CC
CC
Input Threshold Low
T
T
= +25°C
V
A
0.8
2.4
2.4
Input Threshold High
= +25°C
= +25°C
V
A
Input Hysteresis
V
k
Input Resistance
T
A
3
7
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
All transmitter outputs loaded with 3k to ground
5
5.4
V
V
= 0, transmitter output = 2V
300
50k
CC
Output Short-Circuit Current
60
25
mA
µA
V
= 0 or 3V to 5.5V, V
= 12V, transmitters
CC
OUT
Output Leakage Current
disabled (MAX3222E/MAX3232E/MAX3241E)
MOUSE DRIVEABILITY (MAX3241E)
T1IN = T2IN = GND, T3IN = V
,
CC
Transmitter Output Voltage
5
V
T3OUT loaded with 3k to GND,
T1OUT and T2OUT loaded with 2.5mA each
ESD PROTECTION
Human Body Model
15
15
8
R_IN, T_OUT
kV
kV
IEC 1000-4-2 Air-Gap Discharge (except MAX3237E)
IEC 1000-4-2 Contact Discharge (except MAX3237E)
Human Body Model
15
15
8
T_IN, R_IN, R_OUT, EN, SHDN,
MBAUD
MAX3237E
IEC1000-4-2 Air-Gap Discharge
IEC1000-4-2 Contact Discharge
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E
(V
= +3.0V to +5.5V, C1–C4 = 0.1µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
R = 3k , C = 1000pF,
MIN
TYP
MAX
UNITS
L
L
Maximum Data Rate
250
kbps
one transmitter switching
t
t
0.15
0.15
200
200
100
50
PHL
PLH
Receiver input to receiver output,
C = 150pF
L
Receiver Propagation Delay
µs
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (except MAX3232E)
Normal operation (except MAX3232E)
(Note 4)
ns
ns
ns
ns
|t
|t
- t
|
|
PHL PLH
Receiver Skew
- t
PHL PLH
V
= 3.3V,
CC
T
= +25°C,
A
C = 150pF
L
to 1000pF
Transition-Region Slew Rate
R = 3k to 7k , measured
L
from +3V to -3V or -3V to +3V,
one transmitter switching
6
30
V/µs
_______________________________________________________________________________________
3
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
TIMING CHARACTERISTICS—MAX3237E
(V
= +3.0V to +5.5V, C1–C4 = 0.1µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
CC
A
MIN
PARAMETER
CONDITIONS
R = 3k , C = 1000pF, one transmitter switching,
MIN
TYP
MAX
UNITS
L
L
250
MBAUD = GND
V
= 3.0V to 4.5V, R = 3k , C = 250pF,
CC
L
L
Maximum Data Rate
1000
1000
kbps
one transmitter switching, MBAUD = V
CC
V
= 4.5V to 5.5V, R = 3k , C = 1000pF,
CC
L
L
one transmitter switching, MBAUD = V
CC
t
t
0.15
0.15
2.6
PHL
PLH
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
µs
µs
Receiver Output Enable Time
Receiver Output Disable Time
Normal operation
Normal operation
2.4
| t
| t
| t
- t
|, MBAUD = GND
PHL PLH
Transmitter Skew
Receiver Skew
100
50
ns
ns
- t
|, MBAUD = V
|
PHL PLH
CC
- t
PHL PLH
MBAUD =
GND
6
24
4
30
150
30
C = 150pF
L
to 1000pF
V
= 3.3V, R = 3k to
L
CC
7k ,
+3V to -3V or -3V to +3V,
= +25°C
MBAUD =
V/µs
V
Transition-Region Slew Rate
CC
T
A
C = 150pF to 2500pF,
L
MBAUD = GND
Note 2: MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at 3.3V 10ꢀ% C1 = 0.047µF, C2, C3, C4 = 0.33µF tested at 5.0V
10ꢀ. MAX3237E: C1–C4 = 0.1µF tested at 3.3V 5ꢀ, C1–C4 = 0.22µF tested at 3.3V 10ꢀ% C1 = 0.047µF, C2, C3, C4 =
0.33µF tested at 5.0V 10ꢀ.
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.
__________________________________________Typical Operating Characteristics
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k and C , T = +25°C, unless otherwise noted.)
CC
L
A
MAX3222E/MAX3232E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3222E/MAX3232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222E/MAX3232E
SLEW RATE vs. LOAD CAPACITANCE
16
14
12
10
8
45
40
35
30
25
20
6
5
4
3
2
1
0
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
V
OUT+
-SLEW
+SLEW
250kbps
120kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
-1
-2
-3
-4
-5
-6
6
20kbps
15
10
5
4
V
2
OUT-
FOR DATA RATES UP TO 250kbps
0
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k and C , T = +25°C, unless otherwise noted.)
CC
L
A
MAX3241E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3241E
SLEW RATE vs. LOAD CAPACITANCE
6
5
4
3
2
1
0
14
12
10
8
60
50
40
30
20
10
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT+
250kbps
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
120kbps
6
-1
-2
-3
-4
-5
-6
20kbps
4
2
V
OUT-
0
0
1000
2000
3000
4000
5000
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
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
)
CC
12
10
7.5
6
5
4
3
2
1
0
1Mbps
V
+
OUT
5.0
2.5
0
2Mbps
SR-
SR+
1.5Mbps
8
FOR DATA RATES UP TO 250kbps
1 TRANSMITTER 250kbps
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
6
4
3k + C LOAD, EACH OUTPUT
L
-1
-2
-3
-4
-5
-6
WITH 3k + C
L
-2.5
-5.0
-7.5
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
1.5Mbps
1Mbps
2Mbps
2
0
V
OUT-
WITH 3k + C
L
0
500
1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = V
(MBAUD = V
)
CC
)
CC
70
60
50
40
30
20
50
100
80
60
40
20
0
250kbps
120kbps
-SLEW, 1Mbps
+SLEW, 1Mbps
-SLEW, 2Mbps
+SLEW, 2Mbps
40
30
20
10
0
20kbps
1 TRANSMITTER AT 20kbps, 120kbps, 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
|tPLH - t
|
PHL
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3k + C LOAD EACH OUTPUT
1 TRANSMITTER AT 500kbps
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS LOADED
10
0
L
WITH 3k + C
L
WITH 3k + C
L
0
500
1000
1500
2000
0
500
1000 1500 2000 2500 3000
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k and C , T = +25°C, unless otherwise noted.)
L A
CC
MAX3237E
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E
SUPPLY CURRENT vs.
SUPPLY VOLTAGE (MBAUD = GND)
6
5
50
40
30
V
+
OUT
4
3
2
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3k +1000pF
1
0
-1
-2
-3
-4
-5
-6
20
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3k AND 1000pF
10
0
V
OUT-
4.5
2.0
2.5
3.0
3.5
4.0
5.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
-in Description
PIN
MAX3222E
MAX3232E
MAX3241E
NAME
FUNCTION
MAX3237E
TSSOP/
SSOP
TSSOP/
SSOP
SO/DIP
SO/DIP
SSOP/SO
QFN
1
1
—
—
13*
28
23
22
EN
Receiver Enable. Active low.
Positive Terminal of Voltage-
Doubler Charge-Pump Capacitor
2
3
4
2
1
2
3
2
28
27
24
28
27
23
C1+
+5.5V Generated by the Charge
Pump
3
4
3
4
27
25
V+
Negative Terminal of Voltage-
Doubler Charge-Pump Capacitor
C1-
Positive Terminal of Inverting
Charge-Pump Capacitor
5
6
7
5
6
7
4
5
6
5
6
7
1
3
4
1
2
3
29
30
31
C2+
C2-
V-
Negative Terminal of Inverting
Charge-Pump Capacitor
-5.5V Generated by the Charge
Pump
5, 6, 7, 10,
12
9, 10,
11
8, 15
9, 14
8, 17
9, 16
7, 14
8, 13
9, 12
8, 17
9, 16
6, 7, 8
T_OUT
R_IN
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
8, 9, 11
4–8
1–5
13, 14, 15,
17, 18
10, 13
10, 15
12, 15
18, 20, 21
15–19
R_OUT
TTL/CMOS Receiver Outputs
12, 13,
14
17*, 19*,
22*, 23*, 24*
10, 11,
12
11, 12
12, 13
10, 11
13, 14
T_IN
TTL/CMOS Transmitter Inputs
6
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
-in Description (continued)
PIN
MAX3222E
MAX3232E
MAX3241E
NAME
FUNCTION
MAX3237E
TSSOP/
SSOP
TSSOP/
SSOP
SO/DIP
SO/DIP
SSOP/SO
QFN
16
17
18
18
19
20
15
16
—
18
19
—
2
25
26
22
24
26
21
GND
Ground
V
26
14*
+3.0V to +5.5V Supply Voltage
Shutdown Control. Active low.
CC
SHDN
1, 10,
11, 20
9, 16,
25, 32
No Connection
—
—
—
11, 14
—
—
—
—
15*
16
—
N.C.
MegaBaud Control Input.
Connect to GND for normal
operation% connect to V
—
—
—
—
MBAUD
for
CC
1Mbps transmission rates.
Noninverting Complementary
Receiver Outputs. Always active.
—
—
20, 21
19, 20
R_OUTB
*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
V
V
CC
CC
0.1 F
0.1 F
V
V
CC
CC
C1+
C1+
V+
V-
V+
V-
C1
C2
C1
C2
C3
C4
C3
C4
C1-
C2+
C1-
C2+
MAX3222E
MAX3232E
MAX3237E
MAX3241E
MAX3222E
MAX3232E
MAX3237E
MAX3241E
C2-
C2-
T_ OUT
R_ IN
T_ OUT
R_ IN
T_ IN
T_ IN
R_ OUT
R_ OUT
5k
5k
2500pF
150pF
3k
7k
GND
GND
MINIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
MAXIMUM SLEW-RATE TEST CIRCUIT
_______________________________________________________________________________________
7
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
state. Receivers can be either active or inactive in shut-
_______________Detailed Description
down (Table 1).
Dual Chargeꢂ-ump koltage Converter
The complementary outputs on the MAX3237E/MAX3241E
The MAX3222E/MAX3232E/MAX3237E/MAX3241E’s
(R_OUTB) are always active, regardless of the state of EN
internal power supply consists of a regulated dual
or SHDN. This allows the device to be used for ring indica-
charge pump that provides output voltages of +5.5V
tor applications without forward biasing other devices con-
(doubling charge pump) and -5.5V (inverting charge
nected to the receiver outputs. This is ideal for systems
pump), over the 3.0V to 5.5V V
range. The charge
CC
where V
drops to 0 in shutdown to accommodate
CC
pump operates in discontinuous mode% if the output
voltages are less than 5.5V, the charge pump is
enabled, and if the output voltages exceed 5.5V, the
charge pump is disabled. Each charge pump requires
a flying capacitor (C1, C2) and a reservoir capacitor
(C3, C4) to generate the V+ and V- supplies (Figure 1).
peripherals such as UARTs (Figure 2).
MAX3222E/MAX3237E/MAX3241E
ꢁhutdown Mode
Supply current falls to less than 1µA in shutdown mode
(SHDN = low). The MAX3237E’s supply current falls
to10nA (typ) when all receiver inputs are in the invalid
range (-0.3V < R_IN < +0.3). When shut down, the
device’s charge pumps are shut off, V+ is pulled down
Rꢁꢂ232 Transmitters
The transmitters are inverting level translators that con-
vert TTL/CMOS-logic levels to 5.0V EIA/TIA-232 com-
pliant levels.
to V , V- is pulled to ground, and the transmitter
CC
outputs are disabled (high impedance). The time
required to recover from shutdown is typically 100µs,
The MAX3222E/MAX3232E/MAX3237E/MAX3241E
transmitters guarantee a 250kbps data rate with worst-
case loads of 3k in parallel with 1000pF, providing
compatibility with PC-to-PC communication software
(such as LapLink™). Transmitters can be paralleled to
drive multiple receivers or mice.
as shown in Figure 3. Connect SHDN to V
if the shut-
CC
down mode is not used. SHDN has no effect on R_OUT
or R_OUTB (MAX3237E/MAX3241E).
1ꢀ5k EꢁD -rotection
As with all Maxim devices, ESD-protection structures
are incorporated to protect against electrostatic dis-
charges encountered during handling and assembly.
The driver outputs and receiver inputs of the
MAX3222E/MAX3232E/MAX3237E/MAX3241E have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect these pins against ESD of 15kV without damage.
The ESD structures withstand high ESD in all states:
normal operation, shutdown, and powered down. After
an ESD event, Maxim’s E versions keep working without
latchup, whereas competing RS-232 products can latch
and must be powered down to remove latchup.
The MAX3222E/MAX3237E/MAX3241E’s transmitters are
disabled and the outputs are forced into a high-imped-
ance state when the device is in shutdown mode (SHDN =
GND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E
permit the outputs to be driven up to 12V in shutdown.
The MAX3222E/MAX3232E/MAX3241E transmitter
inputs do not have pullup resistors. Connect unused
inputs to GND or V . The MAX3237E’s transmitter
CC
inputs have a 400k active positive feedback resistor,
allowing unused inputs to be left unconnected.
MAX3237E MegaBaud Operation
For higher-speed serial communications, the MAX3237E
features MegaBaud operation. In MegaBaud operating
Furthermore, the MAX3237E logic I/O pins also have
15kV ESD protection. Protecting the logic I/O pins to
15kV makes the MAX3237E ideal for data cable appli-
cations.
mode (MBAUD = V ), the MAX3237E transmitters
CC
guarantee a 1Mbps data rate with worst-case loads of
3k in parallel with 250pF for 3.0V < V
< 4.5V. For 5V
CC
10ꢀ operation, the MAX3237E transmitters guarantee a
1Mbps data rate into worst-case loads of 3k in parallel
with 1000pF.
Table 1. MAX3222E/MAX3237E/MAX3241E
Shutdown and Enable Control Truth Table
R_OUTB
Rꢁꢂ232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3222E/MAX3237E/MAX3241E
receivers have inverting three-state outputs. Drive EN
high to place the receiver(s) into a high-impedance
T_OUT
R_OUT
(MAX3237E/
MAX3241E)
SHDN
EN
0
0
1
1
0
1
0
1
High-Z
High-Z
Active
Active
Active
High-Z
Active
High-Z
Active
Active
Active
Active
LapLink is a trademark of Traveling Software.
8
______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
ESD protection can be tested in various ways% the
transmitter outputs and receiver inputs for the
MAX3222E/MAX3232E/MAX3237E/MAX3241E are
characterized for protection to the following limits:
•
15kV using IEC 1000-4-2’s Air-Gap Discharge
method
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
•
•
15kV using the Human Body Model
8kV using the Contact Discharge method specified
in IEC 1000-4-2
Human Body Model
Figure 4a shows the Human Body Model, and Figure
4b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5k resistor.
V
CC
PREVIOUS
RS-232
V
CC
PROTECTION
DIODE
Rx
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment% it does not specifically
refer to integrated circuits. The MAX3222E/MAX3232E/
MAX3237E/MAX3241E help you design equipment that
meets Level 4 (the highest level) of IEC 1000-4-2, without
the need for additional ESD-protection components.
5k
UART
Tx
GND
SHDN = GND
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2 because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 5a shows the IEC 1000-4-2 model, and
Figure 5b shows the current waveform for the 8kV IEC
1000-4-2 Level 4 ESD Contact Discharge test.
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM
ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
P
LOGIC
TRANSITION
DETECTOR
The Air-Gap Discharge test involves approaching the
device with a charged probe. The Contact Discharge
MAX3237E/MAX3241E
R1OUTB
V
CC
PROTECTION
DIODE
5V/div
0
SHDN
R1IN
Rx
R1OUT
THREE-STATED
T2OUT
EN = V
CC
5k
UART
T1OUT
2V/div
0
T1IN
Tx
GND
SHDN = GND
T1OUT
b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS
(EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN.
B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH.
V
= 3.3V
CC
C1–C4 = 0.1 F
40 s/div
Figure 2. Detection of RS-232 Activity when the UART and
Interface are Shut Down; Comparison of MAX3237E/MAX3241E
(b) with Previous Transceivers (a)
Figure 3. Transmitter Outputs Recovering from Shutdown or
Powering Up
_______________________________________________________________________________________
9
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
method connects the probe to the device before the
probe is energized.
Applications Information
Capacitor ꢁelection
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. All pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
Therefore, after PC board assembly, the Machine
Model is less relevant to I/O ports.
The capacitor type used for C1–C4 is not critical for
proper operation% polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 2 for required capacitor values. Do not use val-
ues smaller than those listed in Table 2. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
and C
to maintain the proper ratios (C1 to
BYPASS
the other capacitors).
R
R
C
1M
D
1500
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
AMPERES
36.8%
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
100pF
STORAGE
CAPACITOR
SOURCE
10%
0
0
TIME
t
RL
t
DL
CURRENT WAVEFORM
Figure 4a. Human Body ESD Test Model
Figure 4b. Human Body Model Current Waveform
I
100%
R
R
D
330
C
50M to 100M
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
10%
t
t = 0.7ns to 1ns
r
30ns
60ns
Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform
Figure 5a. IEC 1000-4-2 ESD Test Model
10 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
6
Table 2. Required Minimum Capacitor
Values
5
V
4
3
OUT+
V
= 3.0V
CC
V
(V)
C1
(µF)
C2, C3, C4
(µF)
CC
2
V
V
1
OUT+
OUT-
MAX3222E/MAX3232E/MAX3241E
0
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
MAX3237E
3.0 to 3.6
3.15 to 3.6
4.5 to 5.5
3.0 to 5.5
0.1
0.047
0.1
0.1
-1
-2
-3
-4
-5
-6
0.33
0.47
V
CC
1
V
OUT-
9
0.22
0.1
0.22
0.1
0
2
3
4
5
6
7
8
10
LOAD CURRENT PER TRANSMITTER (mA)
0.047
0.22
0.33
1.0
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current per Transmitter
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3241E successfully drove all serial
mice tested and met their respective current and volt-
age requirements. Figure 6a shows the transmitter out-
put voltages under increasing load current at 3.0V.
Figure 6b shows a typical mouse connection using the
MAX3241E.
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
-owerꢂꢁupply Decoupling
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E
maintain the RS-232 5.0V minimum transmitter output
voltage even at high data rates. Figure 7 shows a trans-
mitter loopback test circuit. Figure 8 shows a loopback
test result at 120kbps, and Figure 9 shows the same test
at 250kbps. For Figure 8, all transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 9, a single transmitter was driv-
en at 250kbps, and all transmitters were loaded with an
RS-232 receiver in parallel with 1000pF.
In most circumstances, a 0.1µF V
bypass capacitor
CC
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
Operation Down to 2.7k
Transmitter outputs will meet EIA/TIA-562 levels of
3.7V with supply voltages as low as 2.7V.
Transmitter Outputs when
Recovering from ꢁhutdown
The MAX3237 maintains the RS-232 5.0V minimum
transmitter output voltage at data rates up to 1Mbps.
Figure 10 shows a loopback test result at 1Mbps with
MBAUD = V . For Figure 10, all transmitters were
CC
loaded with an RS-232 receiver in parallel with 250pF.
Figure 3 shows two transmitter outputs when recover-
ing from shutdown mode. As they become active, the
two transmitter outputs are shown going to opposite
RS-232 levels (one transmitter input is high, the other is
low). Each transmitter is loaded with 3k in parallel with
2500pF. The transmitter outputs display no ringing or
undesirable transients as they come out of shutdown.
Note that the transmitters are enabled only when the
magnitude of V- exceeds approximately -3V.
Interconnection with 3k and ꢀk Logic
The MAX3222E/MAX3232E/MAX3237E/MAX3241E can
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 3 for more infor-
mation on possible combinations of interconnections.
Mouse Driveability
The MAX3241E has been specifically designed to
power serial mice while operating from low-voltage
______________________________________________________________________________________ 11
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
V
= 3V
CC
to 5.5V
C
BYPASS
26
27
3
28
V
CC
C1+
C1-
V+
V-
C1
C2
C3
C4
24
COMPUTER SERIAL PORT
1
2
C2+
MAX3241E
C2-
9
T1IN
14
T1OUT
T2OUT
T3OUT
+V
+V
T2IN
10
11
13
T3IN
12
21
V
CC
-V
R1OUTB
GND
Tx
20
19
R2OUTB
R1OUT
R1IN
R2IN
R3IN
R4IN
4
5
6
5k
5k
18
17
16
R2OUT
R3OUT
5k
5k
5k
7
R4OUT
R5OUT
EN
MOUSE
15
23
R5IN
8
22
SHDN
V
CC
GND
25
Figure 6b. Mouse Driver Test Circuit
12 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Table 3. Logic-Family Compatibility with
Various Supply Voltages
5V/div
5V/div
5V/div
T1IN
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
V
CC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
T1OUT
R1OUT
Compatible with all
CMOS families
3.3
5
3.3
5
Compatible with all
TTL and CMOS fami-
lies
V
= 3.3V
CC
C1–C4 = 0.1 F
2 s/div
Compatible with ACT
and HCT CMOS, and
with AC, HC, or
5
3.3
Figure 8. MAX3241E Loopback Test Result at 120kbps
CD4000 CMOS
5V/div
T1IN
T1OUT
R1OUT
V
CC
0.1 F
V
5V/div
5V/div
CC
C1+
V+
C3
C1
C1-
C2+
MAX3222E
MAX3232E
MAX3237E
MAX3241E
V-
V
= 3.3V, C1–C4 = 0.1 F
CC
C4
C2
C2-
2 s/div
T_ OUT
T_ IN
Figure 9. MAX3241E Loopback Test Result at 250kbps
R_ IN
5k
R_ OUT
1000pF
+5V
T_IN
0
+5V
GND
0
-5V
+5V
0
T_OUT
5k + 250pF
V
= 3.3V
CC
C1–C4 = 0.1 F
Figure 7. Loopback Test Circuit
R_OUT
400ns/div
Figure 10. MAX3237E Loopback Test Result at 1000kbps
(MBAUD = V
)
CC
______________________________________________________________________________________ 13
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
__________________________________________________________-in Configurations
TOP VIEW
N.C.
C1+
V+
1
2
N.C.
EN
C1+
V+
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
SHDN
1
2
3
4
5
6
7
8
C1+
V+
V
CC
18
17
16
15
14
13
12
11
EN
C1+
V+
1
2
SHDN
20
19
18
17
16
15
14
13
12
11
16
15
14
V
V
GND
CC
V
CC
CC
GND
3
GND
C1-
T1OUT
GND
3
T1OUT
R1IN
C1-
4
T1OUT
R1IN
C1-
T1OUT
R1IN
R1OUT
N.C.
MAX3232E
C1-
4
C2+
C2-
13 R1IN
12 R1OUT
11 T1IN
MAX3232E
MAX3222E
MAX3222E
C2+
C2-
5
C2+
C2-
C2+
C2-
5
R1OUT
T1IN
6
R1OUT
T1IN
6
V-
V-
7
V-
V-
10
9
7
T2OUT
R2IN
T2IN
T2OUT
T2IN
8
T2IN
T2OUT
R2IN
T2OUT
T1IN
R2OUT
8
R2OUT
N.C.
R2IN
N.C.
9
10 R2OUT
T2IN
R2IN
9
SSOP/SO/DIP
R2OUT
10
N.C.
10
SO/DIP
TSSOP
TSSOP/SSOP
TOP VIEW
28
28
27
26
25
24
23
22
1
2
1
2
3
4
5
6
7
8
9
C2+
C2-
C2+
GND
C1+
V+
C1+
27
26
V+
V
C2-
V-
3
CC
V
CC
R1IN
R2IN
1
2
3
4
5
6
7
8
24 GND
V-
25 C1-
4
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
GND
C1-
23 C1-
T1IN
T1OUT
T2OUT
T3OUT
5
24
23
MAX3237E
MAX3241E
R3IN
22 EN
6
T2IN
EN
R4IN
21 SHDN
20 R1OUTB
19 R2OUTB
18 R1OUT
17 R2OUT
7
22 T3IN
21
SHDN
MAX3241E
R5IN
21 R1OUTB
R1IN
R2IN
8
R1OUT
T1OUT
T2OUT
T3OUT
20
19
20
19
R2OUTB
R1OUT
9
R2OUT
T4IN
10
11
12
13
14
T2OUT 10
T4OUT
R3IN
18 R3OUT T3OUT
18 R2OUT
17 R3OUT
16 R4OUT
11
12
13
14
T5IN
17
T5OUT
EN
T3IN
T2IN
T1IN
16 R1OUTB
15
15
MBAUD
R5OUT
SHDN
SSOP
SSOP/SO/TSSOP
QFN
14 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
__________________________________________________Typical Operating Circuits
+3.3V
+3.3V
17
16
C
C
BYPASS
BYPASS
V
V
CC
CC
3
7
2
4
5
6
2
6
1
3
4
5
C1+
C1+
V+
V+
C1
0.1 F
C1
0.1 F
C3*
C3*
0.1 F
0.1 F
C1-
C2+
C1-
C2+
MAX3222E
MAX3232E
V-
V-
C2
0.1 F
C2
0.1 F
C4
0.1 F
C4
0.1 F
C2-
C2-
12
T1OUT
T1IN
15
8
11
T1OUT
T1IN
14
7
TTL/CMOS
INPUTS
RS-232
TTL/CMOS
INPUTS
RS-232
OUTPUTS
OUTPUTS
T2IN
T2OUT
R1IN
11
T2IN
T2OUT
R1IN
10
14
9
13 R1OUT
10 R2OUT
13
8
12 R1OUT
TTL/CMOS
OUTPUTS
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5k
RS-232
INPUTS
5k
R2IN
9
R2OUT
R2IN
5k
5k
EN
1
18
SHDN
GND
16
GND
15
*C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
NOTE: PIN NUMBERS REFER TO SO/DIP PACKAGES.
SEE TABLE 2 FOR CAPACITOR SELECTION.
______________________________________________________________________________________ 15
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
_____________________________________Typical Operating Circuits (continued)
+3.3V
+3.3V
C
C
BYPASS
28
BYPASS
26
26
V
V
CC
CC
27
4
27
3
28
C1+
C1+
V+
V-
V+
C1
C3*
0.1 F
0.1 F
C3*
0.1 F
25
1
24
1
C1-
C2+
C1-
C2+
0.1 F
MAX3237E
MAX3241E
V-
C2
0.1 F
C4
0.1 F
0.1 F
0.1 F
3
2
C2-
C2-
T1IN
T1IN
T1OUT
T2OUT
T3OUT
5
6
7
T1OUT
9
24
14
13
T1
T2
T2IN
T3IN
T2IN
T2OUT 10
23
22
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T3IN
12
21
11
T3OUT
R1IN
RS-232
OUTPUTS
LOGIC
T3
T4
T5
INPUTS
R1OUTB
T4IN
T5IN
T4OUT 10
19
17
R2OUTB
R1OUT
20
19
12
T5OUT
R1IN
4
5
R1OUTB
R1OUT
16
21
5k
R2OUT
R3OUT
R4OUT
R2IN
18
17
16
8
9
R1
R2
R3
5k
TTL/CMOS
OUTPUTS
5k
6
7
8
R3IN
RS-232
INPUTS
RS-232
INPUTS
R2OUT
R3OUT
R2IN
R3IN
20
18
LOGIC
OUTPUTS
5k
5k
5k
R4IN
11
5k
R5OUT
EN
15
23
R5IN
15
14
5k
MBAUD
SHDN
EN
13
22
SHDN
GND
2
GND
25
*C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
16 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Ordering Information (continued)
___________________Chip Information
TRANSISTOR COUNT:
PART
TEMP RANGE
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
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
PIN-PACKAGE
18 Wide SO
18 Plastic DIP
Dice*
MAX3222E/MAX3232E: 1129
MAX3237E: 2110
MAX3222ECWN
MAX3222ECPN
MAX3222EC/D
MAX3222EEUP
MAX3222EEAP
MAX3222EEWN
MAX3222EEPN
MAX3232ECAE
MAX3232ECWE
MAX3232ECPE
MAX3232ECUP
MAX3232EEAE
MAX3232EEWE
MAX3241E: 1335
20 TSSOP
20 SSOP
18 Wide SO
18 Plastic DIP
16 SSOP
16 Wide SO
16 Plastic DIP
20 TSSOP
16 SSOP
16 Wide SO
MAX3232EEPE
MAX3232EEUP
MAX3237ECAI
MAX3237EEAI
MAX3241ECAI
MAX3241ECWI
MAX3241ECUI
MAX3241ECGJ
MAX3241EEAI
-40°C to +85°C
-40°C to +85°C
-0°C to +70°C
-40°C to +85°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
16 Plastic DIP
20 TSSOP
28 SSOP
28 SSOP
28 SSOP
28 Wide SO
28 TSSOP
32 QFN
28 SSOP
MAX3241EEWI
-40°C to +85°C
28 Wide SO
28 TSSOP
MAX3241EEUI
-40°C to +85°C
______________________________________________________________________________________ 17
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
-ac5age Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
18 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
-ac5age Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
19 ____________________Maxim Integrated -roducts, 120 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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