MAX3222E_03 [MAXIM]
【15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers; ± 15kV ESD保护，低至10nA的， 3.0V至5.5V ，最高可达1Mbps，真RS- 232收发器
| 型号： | MAX3222E_03 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 【15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers |
| 文件： | 总22页 (文件大小：411K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1298; Rev 7; 2/03
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
General Description
Features
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 ±1ꢀ5V using IEꢁ 1000-4-2 Air-ꢂap
Discharge, ±85V using IEꢁ 1000-4-2 ꢁontact Discharge
(±±5V for MAX3246E), and ±1ꢀ5V using the ꢃuman ꢄodꢅ
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 ±1ꢀ5V using the ꢃuman
ꢄodꢅ Model.
o ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3241E/MAX3246E)
15kV—Human Body Model
8kV—IEC 1000-4-2, Contact Discharge
9kV (MAX3246E Only)—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
A proprietarꢅ low-dropout transmitter output stage delivers
true RS-232 performance from a +3.0V to +ꢀ.ꢀV power
supplꢅ, using an internal dual charge pump. The charge
pump requires onlꢅ four small 0.1µF capacitors for opera-
tion from a +3.3V supplꢅ. Each device guarantees opera-
tion at data rates of 2ꢀ05bps while maintaining RS-232
output levels. The MAX3237E guarantees operation at
2ꢀ05bps in the normal operating mode and 1Mbps in the
Megaꢄaud™ 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 batterꢅ-pow-
ered portable sꢅstems. The MAX3222E receivers remain
active in shutdown mode, allowing monitoring of external
devices while consuming onlꢅ 1µA of supplꢅ current. The
MAX3222E and MAX3232E are pin, pac5age, and func-
tionallꢅ compatible with the industrꢅ-standard MAX242
and MAX232, respectivelꢅ.
o ESD Protection for Transmitter Output Pins
(MAX3237E)
15kV—Human Body Model
o Guaranteed Data Rate
250kbps (MAX3222E/MAX3232E/MAX3241E/
MAX3246E/MAX3237E, Normal Operation)
1Mbps (MAX3237E, MegaBaud Operation)
o Latchup Free
o Low-Power Shutdown with Receivers Active
1µA (MAX3222E/MAX3241E/MAX3246E)
10nA (MAX3237E)
o Flow-Through Pinout (MAX3237E)
o Guaranteed Mouse Drivability (MAX3241E)
o Meets EIA/TIA-232 Specifications Down to +3.0V
The MAX3241E/MAX3246E are complete serial ports
(three drivers/five receivers) designed for noteboo5 and
subnoteboo5 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 onlꢅ 1µA (MAX3241E/MAX3246E) or 10nA
(MAX3237E).
The MAX3222E, MAX3232E, and MAX3241E are avail-
able in space-saving SO, SSOP, and TSSOP pac5ages.
The MAX3237E is offered in an SSOP pac5age. The
MAX3246E is offered in the ultra-small 6 x 6 UꢁSP™
pac5age.
_______________Ordering Information
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
20 TSSOP
MAX3222ECUP
MAX3222ECAP
20 SSOP
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________Applications
ꢄatterꢅ-Powered Equipment Printers
ꢁell Phones
ꢁell-Phone Data ꢁables
Noteboo5, Subnoteboo5,
and Palmtop ꢁomputers
Smart Phones
xDSL Modems
MegaBaud is a trademark of Maxim Integrated Products, Inc.
UCSP 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
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-Lead QFN (derate 23.2mW/°C above +70°C) .........1860mW
6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW
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
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
Bump Reflow Temperature (Note 2)
Infrared, 15s..................................................................+200°C
Vapor Phase, 20s..........................................................+215°C
R_OUT, R_OUTB (MAX3241E)................-0.3V to (V
+ 0.3V)
CC
Short-Circuit Duration, T_OUT to GND.......................Continuous
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
18-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW
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 = +3V to +5.5V, C1–C4 = 0.1µF, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Notes 3, 4)
MAX A
CC
A
MIN
PARAMETER
CONDITIONS
= +3.3V or +5V, T = +25°C)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
CC
A
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
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
= +5.0V
2.0
2.4
CC
CC
Input Logic High
T_IN, EN, SHDN, MBAUD
Transmitter Input Hysteresis
0.5
0.01
9
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
T_IN, EN, SHDN
1
Input Leakage Current
µA
T_IN, SHDN, MBAUD
MAX3237E (Note 5)
18
RECEIVER OUTPUTS
R_OUT (MAX3222E/MAX3237E/MAX3241E/
MAX3246E), EN = V , receivers disabled
Output Leakage Current
0.05
10
µA
V
CC
I
= 1.6mA (MAX3222E/MAX3232E/MAX3241E/
OUT
MAX3246E), I
Output Voltage Low
0.4
= 1.0mA (MAX3237E)
OUT
2
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V = +3V to +5.5V, C1–C4 = 0.1µF, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Notes 3, 4)
MAX A
CC
A
MIN
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
0.6
-
V
0.1
-
CC
CC
Output Voltage High
I
= -1.0mA
V
OUT
RECEIVER INPUTS
Input Voltage Range
-25
0.6
0.8
+25
V
V
V
V
V
V
= +3.3V
= +5.0V
= +3.3V
= +5.0V
1.1
1.5
1.5
2.0
0.5
5
CC
CC
CC
CC
Input Threshold Low
Input Threshold High
T
T
= +25°C
A
2.4
2.4
= +25°C
= +25°C
V
A
Input Hysteresis
V
k
Input Resistance
T
3
7
A
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 +3.0V to +5.5V, V
= 12V, transmitters
CC
OUT
Output Leakage Current
disabled (MAX3222E/MAX3232E/MAX3241E/MAX3246E)
MOUSE DRIVABILITY (MAX3241E)
T1IN = T2IN = GND, T3IN = V , T3OUT loaded with
CC
Transmitter Output Voltage
3k to GND, T1OUT and T2OUT loaded with 2.5mA
each
5
V
ESD PROTECTION
Human Body Model
15
15
8
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)
Human Body Model
R_IN, T_OUT
kV
kV
9
15
15
8
T_IN, R_IN, R_OUT, EN, SHDN,
MBAUD
MAX3237E
IEC1000-4-2 Air-Gap Discharge
IEC1000-4-2 Contact Discharge
_______________________________________________________________________________________
3
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E
(V = +3V to +5.5V, C1–C4 = 0.1µF, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Notes 3, 4)
MAX A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= T
MIN
250
250
TYP
MAX
UNITS
T
to T
MAX
A
MIN
R = 3k ,
C = 1000pF,
L
L
(MAX3222E/MAX3232E/
MAX3241E)
Maximum Data Rate
kbps
one transmitter
switching
T = +25°C (MAX3246E)
A
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 6)
ns
ns
ns
ns
|t
|t
- t
|
|
PHL PLH
Receiver Skew
- t
PHL PLH
V
CC
= +3.3V, T = +25°C,
A
C = 150pF
L
to 1000pF
R = 3k to 7k , measured
L
from +3.0V to –3.0V or –3.0V to
Transition-Region Slew Rate
6
30
V/µs
+3.0V, one transmitter switching
TIMING CHARACTERISTICS—MAX3237E
(V
= +3V to +5.5V, C1–C4 = 0.1µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
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
V
- t
|, MBAUD = GND (Note 6)
PHL PLH
Transmitter Skew
Receiver Skew
100
50
ns
ns
- t
|, MBAUD = V (Note 6)
CC
PHL PLH
- t
|
PHL PLH
= +3.3V,
MBAUD = GND
MBAUD = V
6
30
CC
C = 150pF
L
to 1000pF
R = 3k to 7k ,
L
+3.0V to –3.0V or
-3.0V to +3.0V,
24
150
CC
V/µs
Transition-Region Slew Rate
C = 150pF to 2500pF,
L
MBAUD = GND
4
30
T
A
= +25°C
Note 3: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. MAX3246E% C1-C4 = 0.22µF tested at +3.3V 10ꢀ% C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at
5.0V 10ꢀ.
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: Transmitter skew is measured at the transmitter zero crosspoints.
4
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
__________________________________________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)
MAX3241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3241E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3241E
SLEW RATE vs. LOAD CAPACITANCE
6
14
60
50
40
30
20
10
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
5
4
V
OUT+
12
10
8
250kbps
3
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
2
120kbps
1
0
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
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
)
CC
6
5
4
3
2
1
7.5
5.0
2.5
0
6
5
1Mbps
V
OUT+
V
+
OUT
4
FOR DATA RATES UP TO 250kbps
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
2Mbps
1.5Mbps
3
2
FOR DATA RATES UP TO 250kbps
1 TRANSMITTER 250kbps
1 TRANSMITTER AT FULL DATA RATE
1
4 TRANSMITTERS AT 1/16 DATA RATE
WITH 3k + C
L
0
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
0
3k + C LOAD, EACH OUTPUT
L
-1
-2
-3
-4
-5
-1
-2
-3
-4
-5
-6
WITH 3k + C
L
-2.5
-5.0
-7.5
1.5Mbps
1Mbps
2Mbps
V
OUT-
V
OUT-
-6
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)
_______________________________________________________________________________________
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
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
(MBAUD = V
)
CC
12
10
70
60
50
40
30
20
50
250kbps
120kbps
-SLEW, 1Mbps
+SLEW, 1Mbps
-SLEW, 2Mbps
+SLEW, 2Mbps
40
30
20
10
0
SR-
SR+
8
20kbps
6
4
1 TRANSMITTER AT 20kbps, 120kbps, 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
1 TRANSMITTER AT FULL DATA RATE
2
0
4 TRANSMITTERS AT 1/16 DATA RATE
10
0
3k + C LOAD EACH OUTPUT
L
WITH 3k + C
L
WITH 3k + C
L
0
500
1000
1500
2000
0
500
1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
0
500
1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E
MAX3237E SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MBAUD = GND)
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = V
)
CC
50
6
5
100
80
60
40
20
0
V
+
OUT
4
40
30
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
|tPLH - t
|
PHL
10
0
1 TRANSMITTER AT 500kbps
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS LOADED
V
OUT-
4.5
WITH 3k + C
L
2.0
2.5
3.0
3.5
4.0
4.5
5.0
2.0
2.5
3.0
3.5
4.0
5.0
0
500
1000
1500
2000
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
MAX3246E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3246E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3246E
SLEW RATE vs. LOAD CAPACITANCE
60
55
50
45
40
35
30
25
20
15
10
5
16
14
7
6
5
4
3
2
1
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
12
250kbps
120kbps
SR-
SR+
10
8
-1
-2
-3
-4
-5
-6
20kbps
6
4
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)
6
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
-in Description
PIN
MAX3222E
MAX3232E
MAX3241E
NAME
FUNCTION
MAX3246E
TSSOP/ SO/DIP/
MAX3237E
SO/DIP
TSSOP
SSOP/SO QFN
SSOP
SSOP
1
1
—
—
13*
28
23
28
22
28
B3
F3
EN
Receiver Enable. Active low.
Positive Terminal of Voltage-
Doubler Charge-Pump
Capacitor
2
3
2
3
1
2
C1+
+5.5V Generated by the
Charge Pump
2
3
3
4
27
25
27
24
27
23
F1
F4
V+
Negative Terminal of Voltage-
Doubler Charge-Pump
Capacitor
4
4
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
E1
D1
C2+
C2-
V-
Negative Terminal of Inverting
Charge-Pump Capacitor
-5.5V Generated by the
Charge Pump
C1
5, 6, 7,
10, 12
9, 10,
11
6, 7,
8
8, 15
9, 14
8, 17
9, 16
7, 14
8, 13
8, 17
9, 16
F6, E6, D6
T_OUT
R_IN
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
A4, A5,
A6, B6, C6
8, 9, 11
4–8
1–5
13, 14,
15, 17,
18
C2, B1,
18, 20,
21
10, 13
11, 12
10, 15
12, 13
9, 12
12, 15
13, 14
15–19
R_OUT
TTL/CMOS Receiver Outputs
TTL/CMOS Transmitter Inputs
A1, A2, A3
17*, 19*,
22*, 23*,
24*
12, 13,
14
10, 11,
12
10, 11
E3, E2, D2
T_IN
GND
16
17
18
18
19
20
15
16
—
18
19
—
2
25
26
22
24
26
21
F5
F2
B2
Ground
V
26
CC
+3.0V to +5.5V Supply Voltage
Shutdown Control. Active low.
14*
SHDN
No Connection. For
MAX3246E, these locations
are not populated with solder
bumps.
C3, D3, B4,
C4, D4, E4,
1, 10, 11,
20
9, 16,
—
11, 14
—
—
—
N.C.
25, 32 B5, C5, D5,
E5
MegaBaud Control Input.
Connect to GND for normal
—
—
—
—
—
—
—
—
15*
16
—
—
—
—
MBAUD
R_OUTB
operation% connect to V
for
CC
1Mbps transmission rates.
Noninverting Complementary
Receiver Outputs. Always
active.
20, 21
19, 20
*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
_______________________________________________________________________________________
7
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
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
MAX3246E
MAX3222E
MAX3232E
MAX3237E
MAX3241E
MAX3246E
C2-
C2-
T_ OUT
R_ IN
T_ OUT
R_ IN
T_ IN
T_ IN
R_ OUT
R_ OUT
5k
5k
1000pF
(2500pF, MAX3237E only)
7k
150pF
3k
GND
GND
MINIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
MAXIMUM SLEW-RATE TEST CIRCUIT
into a high-impedance state when the device is in shut-
down mode (SHDN = GND). The MAX3222E/
MAX3232E/MAX3237E/MAX3241E/MAX3246E permit
the outputs to be driven up to 12V in shutdown.
Detailed Description
Dual Chargeꢂ-ump koltage Converter
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246Es’ internal power supply consists of a regu-
lated dual charge pump that provides output voltages
of +5.5V (doubling charge pump) and -5.5V (inverting
The MAX3222E/MAX3232E/MAX3241E/MAX3246E
transmitter inputs do not have pullup resistors. Connect
unused inputs to GND or V . The MAX3237E’s trans-
CC
charge pump) over the +3.0V to +5.5V V
range. The
CC
mitter inputs have a 400k active positive-feedback
resistor, allowing unused inputs to be left unconnected.
charge 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).
MAX3237E MegaBaud Operation
For higher-speed serial communications, the
MAX3237E features MegaBaud operation. In
MegaBaud operating mode (MBAUD = V ), the
CC
MAX3237E transmitters guarantee a 1Mbps data rate
with worst-case loads of 3k in parallel with 250pF for
Rꢁꢂ232 Transmitters
The transmitters are inverting level translators that con-
vert TTL/CMOS-logic levels to 5V EIA/TIA-232-compli-
ant levels.
+3.0V < V
< +4.5V. For +5V 10ꢀ operation, the
CC
MAX3237E transmitters guarantee a 1Mbps data rate
into worst-case loads of 3k in parallel with 1000pF.
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E 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 par-
alleled to drive multiple receivers or mice.
Rꢁꢂ232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3222E/MAX3237E/MAX3241E/
MAX3246E receivers have inverting three-state outputs.
Drive EN high to place the receiver(s) into a high-
impedance state. Receivers can be either active or
inactive in shutdown (Table 1).
The MAX3222E/MAX3237E/MAX3241E/MAX3246E
transmitters are disabled and the outputs are forced
LapLink is a trademark of Traveling Software.
8
______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
V
CC
5V/div
0
SHDN
T2OUT
PREVIOUS
RS-232
V
CC
PROTECTION
2V/div
0
DIODE
Rx
5k
UART
T1OUT
Tx
V
= 3.3V
CC
GND
C1–C4 = 0.1 F
SHDN = GND
40 s/div
Figure 3. Transmitter Outputs Recovering from Shutdown or
Powering Up
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM
A ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
P
MAX3222E/MAX3237E/MAX3241E/
MAX3246E ꢁ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
to V , V- is pulled to ground, and the transmitter out-
CC
puts are disabled (high impedance). The time required
to recover from shutdown is typically 100µs, as shown
LOGIC
TRANSITION
DETECTOR
MAX3237E/MAX3241E
R1OUTB
V
CC
PROTECTION
DIODE
R1IN
Rx
R1OUT
THREE-STATED
in Figure 3. Connect SHDN to V
if shutdown mode is
CC
EN = V
CC
5k
not used. SHDN has no effect on R_OUT or R_OUTB
UART
(MAX3237E/MAX3241E).
T1OUT
T1IN
Tx
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/MAX3246E
have extra protection against static electricity. Maxim’s
engineers have developed state-of-the-art structures to
protect 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.
GND
SHDN = GND
b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS
B (EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN.
B B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH.
Figure 2. Detection of RS-232 Activity when the UART and
Interface are Shut Down; Comparison of MAX3237E/MAX3241E
(b) with Previous Transceivers (a)
The complementary outputs on the MAX3237E/
MAX3241E (R_OUTB) are always active, regardless of the
state of EN or SHDN. This allows the device to be used
for ring indicator applications without forward biasing
other devices connected to the receiver outputs. This is
ideal for systems where V
to accommodate peripherals such as UARTs (Figure 2).
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
applications.
drops to zero in shutdown
CC
_______________________________________________________________________________________
9
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
Table 1. MAX3222E/MAX3237E/MAX3241E/
MAX3246E Shutdown and Enable Control
Truth Table
transmitter outputs and receiver inputs for the
MAX3222E/MAX3232E/MAX3241E/MAX3246E are
characterized for protection to the following limits:
•
•
15kV using the Human Body Model
R_OUTB
(MAX3237E/
MAX3241E)
SHDN
EN
T_OUT
R_OUT
8kV using the Contact Discharge method specified
in IEC 1000-4-2
0
0
1
1
0
1
0
1
High-Z
High-Z
Active
Active
Active
High-Z
Active
High-Z
Active
Active
Active
Active
•
•
9kV (MAX3246E only) using the Contact Discharge
method specified in IEC 1000-4-2
15kV using the Air-Gap Discharge method speci-
fied in IEC 1000-4-2
R
R
C
1M
D
1500
DISCHARGE
RESISTANCE
I
P
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
CHARGE-CURRENT
LIMIT RESISTOR
I
r
HIGH-
VOLTAGE
DC
AMPERES
DEVICE
UNDER
TEST
C
STORAGE
CAPACITOR
s
100pF
36.8%
SOURCE
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 4b. Human Body Model Current Waveform
Figure 4a. Human Body ESD Test Model
I
100%
R
R
D
330
C
90%
50M to 100M
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 5a. IEC 1000-4-2 ESD Test Model
Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform
10 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Table 2. Required Minimum Capacitor
Values
6
5
VCC
(V)
C1
(µF)
C2, C3, C4
(µF)
V
OUT+
4
3
V
= 3.0V
CC
2
MAX3222E/MAX3232E/MAX3241E
V
V
1
OUT+
OUT-
3.0 to 3.6
4.5 to 5.5
0.1
0.047
0.1
0.1
0
0.33
0.47
-1
-2
-3
-4
-5
-6
3.0 to 5.5
V
CC
1
MAX3237E/MAX3246E
3.0 to 3.6
V
OUT-
9
0.22
0.1
0.22
0.1
3.15 to 3.6
0
2
3
4
5
6
7
8
10
4.5 to 5.5
0.047
0.22
0.33
1.0
LOAD CURRENT PER TRANSMITTER (mA)
3.0 to 5.5
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current Per Transmitter
Table 3. Logic-Family Compatibility with
Various Supply Voltages
IEC 1000ꢂ4ꢂ2
SYSTEM
V
CC
SUPPLY
VOLTAGE
(V)
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment% it does not specifi-
cally refer to integrated circuits. The MAX3222E/
MAX3232E/MAX3237E/MAX3241E/MAX3246E help you
design equipment that meets level 4 (the highest level)
of IEC 1000-4-2, without the need for additional ESD-
protection components.
POWER-SUPPLY
VOLTAGE
(V)
COMPATIBILITY
Compatible with all
CMOS families
3.3
5
3.3
5
Compatible with all
TTL and CMOS
families
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. The Air-
Gap Discharge test involves approaching the device
with a charged probe. The Contact Discharge method
connects the probe to the device before the probe is
energized.
Compatible with ACT
and HCT CMOS, and
with AC, HC, or
5
3.3
CD4000 CMOS
For the MAX3237E, all logic and RS-232 I/O pins are
characterized for protection to 15kV per the Human
Body Model.
EꢁD 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.
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.
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 interest,
which is then discharged into the test device through a
1.5k resistor.
______________________________________________________________________________________ 11
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
V
= +3.0V TO +5.5V
CC
C
BYPASS
26
27
3
28
V
CC
C1+
V+
V-
C1
C3
C4
24
C1-
COMPUTER SERIAL PORT
1
C2+
MAX3241E
C2
2
C2-
9
T1IN
14
13
T1OUT
T2OUT
T3OUT
+V
+V
T2IN
10
11
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
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-.
Applications Information
Capacitor ꢁelection
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,
-owerꢂꢁupply Decoupling
In most circumstances, a 0.1µF V
bypass capacitor
CC
is adequate. In applications sensitive to power-supply
noise, use a capacitor of the same value as charge-
pump capacitor C1. Connect bypass capacitors as
close to the IC as possible.
Operation Down to 2.7k
Transmitter outputs meet EIA/TIA-562 levels of 3.7V
with supply voltages as low as 2.7V.
and C
to maintain the proper ratios (C1 to
the other capacitors).
BYPASS
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
12 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3.0V.
Transmitter Outputs Recovering
from ꢁhutdown
Figure 3 shows two transmitter outputs recovering from
shutdown mode. As they become active, the two trans-
mitter 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 undesir-
able transients as they come out of shutdown. Note that
Mouse Drivability
The MAX3241E is designed to power serial mice while
operating from low-voltage power supplies. It has
been tested with leading mouse brands from manu-
facturers such as Microsoft and Logitech. The
MAX3241E successfully drove all serial mice tested
and met their current and voltage requirements.
V
CC
0.1 F
5V/div
5V/div
5V/div
T1IN
T1OUT
R1OUT
V
CC
C1+
V+
V-
C3
C4
C1
C1-
C2+
MAX3222E
MAX3232E
MAX3237E
MAX3241E
MAX3246E
C2
C2-
V
= 3.3V, C1–C4 = 0.1 F
CC
T_ OUT
T_ IN
2 s/div
R_ IN
5k
R_ OUT
Figure 9. MAX3241E Loopback Test Result at 250kbps
1000pF
GND
+5V
T_IN
0
Figure 7. Loopback Test Circuit
+5V
0
-5V
+5V
0
T_OUT
5k + 250pF
V
= 3.3V
CC
C1–C4 = 0.1 F
R_OUT
5V/div
T1IN
400ns/div
5V/div
5V/div
T1OUT
Figure 10. MAX3237E Loopback Test Result at 1000kbps
(MBAUD = V
)
CC
R1OUT
V
= 3.3V
CC
C1–C4 = 0.1 F
2 s/div
Figure 8. MAX3241E Loopback Test Result at 120kbps
______________________________________________________________________________________ 13
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
Figure 6a shows the transmitter output voltages under
increasing load current at +3.0V. Figure 6b shows a
typical mouse connection using the MAX3241E.
UCꢁ- Reliability
The UCSP represents a unique packaging form factor
that may not perform equally to a packaged product
through traditional mechanical reliability tests. UCSP
reliability is integrally linked to the user’s assembly
methods, circuit board material, and usage environ-
ment. The user should closely review these areas when
considering use of a UCSP package. Performance
through Operating Life Test and Moisture Resistance
remains uncompromised as the wafer-fabrication
process primarily determines it.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E maintain the RS-232 5V minimum transmit-
ter output voltage even at high data rates. Figure 7
shows a transmitter 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 trans-
mitters were driven simultaneously at 120kbps into RS-
232 loads in parallel with 1000pF. For Figure 9, a single
transmitter was driven at 250kbps, and all transmitters
were loaded with an RS-232 receiver in parallel with
1000pF.
Mechanical stress performance is a greater considera-
tion for a UCSP package. UCSPs are attached through
direct solder contact to the user’s PC board, foregoing
the inherent stress relief of a packaged product lead
frame. Solder joint contact integrity must be consid-
ered. Table 4 shows the testing done to characterize
the UCSP reliability performance. In conclusion, the
UCSP is capable of performing reliably through envi-
ronmental stresses as indicated by the results in the
table. Additional usage data and recommendations are
detailed in the UCSP application note, which can be
found on Maxim’s website at www.maxim-ic.com.
The MAX3237E 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.
Interconnection with 3k and ꢀk Logic
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E can directly interface with various 5V logic
families, including ACT and HCT CMOS. See Table 3
for more information on possible combinations of inter-
connections.
Table 4. Reliability Test Data
FAILURES PER
DURATION
TEST
CONDITIONS
SAMPLE SIZE
T
T
= -35°C to +85°C,
= -40°C to +100°C
150 cycles,
900 cycles
0/10,
0/200
A
A
Temperature Cycle
Operating Life
T
T
T
T
= +70°C
240 hours
240 hours
240 hours
24 hours
—
0/10
0/10
0/10
0/10
0/15
0/5
A
A
A
A
Moisture Resistance
Low-Temperature Storage
Low-Temperature Operational
Solderability
= +20°C to +60°C, 90ꢀ RH
= -20°C
= -10°C
8-hour steam age
ESD
15kV, Human Body Model
—
High-Temperature Operating
Life
T = +150°C
J
168 hours
0/45
14 ______________________________________________________________________________________
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
______________________________________________________________________________________ 15
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
-in Configurations (continued)
TOP VIEW
(BUMPS ON BOTTOM)
B2: SHDN
C2: R1OUT
R4OUT R5OUT
R1IN
A4
R2IN
A5
D2: T3IN
E2: T2IN
B3: EN
E3: T1IN
BUMPS B4, B5, C3, C4,
C5, D3, D4, D5, E4, AND
E5 NOT POPULATED
A1
A2
B2
C2
D2
E2
F2
A3
A6 R3IN
B6 R4IN
R3OUT
R2OUT B1
B3
C6
C1
V-
R5IN
MAX3246E
C2-
C2+
V+
D6 T3OUT
D1
E1
F1
E3
E6
T2OUT
F3
F4
F5
F6 T1OUT
V
C1+
C1-
GND
CC
UCSP
16 ______________________________________________________________________________________
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.
______________________________________________________________________________________ 17
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
0.1 F
0.1 F
C4
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
RS-232
T3OUT
R1IN
LOGIC
INPUTS
T3
T4
T5
OUTPUTS
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
5k
OUTPUTS
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
18 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
_____________________________________Typical Operating Circuits (continued)
+3.3V
C
BYPASS
F2
V
CC
F1
F3
C1+
V+
V-
C1
0.1 F
C3*
F4
E1
D1
C1-
C2+
0.1 F
MAX3246E
C1
C2
0.1 F
C4
0.1 F
C2-
T1IN
T1OUT F6
T2OUT E6
E3
E2 T2IN
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T3IN
D2
C2
D6
A4
T3OUT
R1OUT
R1IN
5k
R2OUT
R3OUT
R4OUT
R2IN A5
B1
A1
A2
5k
5k
TTL/CMOS
OUTPUTS
A6
B6
R3IN
R4IN
RS-232
INPUTS
5k
5k
R5OUT
EN
A3
B3
R5IN C6
B2
SHDN
GND
F5
*C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
______________________________________________________________________________________ 19
1ꢀ5k EꢁDꢂ-rotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁꢂ232 Transceivers
ꢁelector Guide
Ordering Information (continued)
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
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
-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
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
18 Wide SO
18 Plastic DIP
Dice*
LOW-POWER
SHUTDOWN
PART
MAX3222ECWN
MAX3222ECPN
MAX3222EC/D
MAX3222EEUP
MAX3222EEAP
MAX3222EEWN
MAX3222EEPN
MAX3232ECAE
MAX3232ECWE
MAX3232ECPE
MAX3232ECUP
MAX3232EEAE
MAX3232EEWE
MAX3232EEPE
MAX3232EEUP
MAX3237ECAI
MAX3237EEAI
MAX3241ECAI
MAX3241ECWI
MAX3241ECUI
MAX3241ECGJ
MAX3241EEAI
MAX3241EEWI
MAX3241EEUI
MAX3246ECBX-T
MAX3246EEBX-T
MAX3222E
MAX3232E
2/2
2/2
✔
250k
250k
—
20 TSSOP
20 SSOP
MAX3237E
(Normal)
5/3
5/3
✔
✔
250k
1M
18 Wide SO
18 Plastic DIP
16 SSOP
MAX3237E
(MegaBaud)
MAX3241E
MAX3246E
3/5
3/5
✔
✔
250k
250k
16 Wide SO
16 Plastic DIP
20 TSSOP
16 SSOP
___________________Chip Information
TRANSISTOR COUNT:
16 Wide SO
16 Plastic DIP
20 TSSOP
28 SSOP
MAX3222E/MAX3232E: 1129
MAX3237E: 2110
MAX3241E: 1335
28 SSOP
MAX3246E: 842
28 SSOP
28 Wide SO
28 TSSOP
32 QFN
28 SSOP
28 Wide SO
28 TSSOP
6 x 6 UCSP*
6 x 6 UCSP*
*Requires solder temperature profile described in the Absolute
Maximum Ratings section. UCSP Reliability is integrally linked
to the user’s assembly methods, circuit board material, and
environment. Refer to the UCSP Reliability Notice in the UCSP
Reliability section of this datasheet for more information.
20 ______________________________________________________________________________________
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.)
______________________________________________________________________________________ 21
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.
22 ____________________Maxim Integrated -roducts, 120 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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