MAX3241ECAI-T [MAXIM]
Line Transceiver, 3 Func, 3 Driver, 5 Rcvr, BICMOS, PDSO28, 5.30 MM, MO-150, SSOP-28;
| 型号： | MAX3241ECAI-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 3 Func, 3 Driver, 5 Rcvr, BICMOS, PDSO28, 5.30 MM, MO-150, SSOP-28 信息通信管理 光电二极管 |
| 文件： | 总26页 (文件大小：677K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1298; Rev 9; 9/05
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
General Description
Next-Generation Device Features
♦ For Space-Constrained Applications
MAX3228E/MAX3229E: 15kV ESD-Protected,
+2.5V to +5.5V, RS-232 Transceivers in UCSP
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.
♦ For Low-Voltage or Data Cable Applications
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx, RS-232 Transceivers with 15kV
ESD-Protected I/O and Logic Pins
_______________Ordering Information
PIN-
PACKAGE
PKG
CODE
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.
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).
PART
TEMP RANGE
20 Thin QFN-
MAX3222EꢁTP
0°ꢁ to +70°ꢁ EP** (ꢀmm x
ꢀmm)
T20ꢀꢀ-ꢀ
MAX3222EꢁUP
MAX3222EꢁAP
MAX3222EꢁWN
MAX3222EꢁPN
MAX3222Eꢁ/D
0°ꢁ to +70°ꢁ 20 TSSOP
—
—
—
—
—
0°ꢁ to +70°ꢁ 20 SSOP
0°ꢁ to +70°ꢁ 18 Wide SO
0°ꢁ to +70°ꢁ 18 Plastic DIP
0°ꢁ to +70°ꢁ Dice*
20 Thin QFN-
EP** (ꢀmm x
ꢀmm)
MAX3222EETP
-40°ꢁ to +8ꢀ°ꢁ
T20ꢀꢀ-ꢀ
MAX3222EEUP
MAX3222EEAP
-40°ꢁ to +8ꢀ°ꢁ 20 TSSOP
-40°ꢁ to +8ꢀ°ꢁ 20 SSOP
—
—
—
—
—
—
—
MAX3222EEWN -40°ꢁ to +8ꢀ°ꢁ 18 Wide SO
MAX3222EEPN
MAX3232EꢁAE
MAX3232EꢁWE
MAX3232EꢁPE
-40°ꢁ to +8ꢀ°ꢁ 18 Plastic DIP
0°ꢁ to +70°ꢁ 16 SSOP
0°ꢁ to +70°ꢁ 16 Wide SO
0°ꢁ to +70°ꢁ 16 Plastic DIP
*Dice are tested at T = +25°C, DC parameters only.
A
**EP = Exposed paddle.
The MAX3222E, MAX3232E, and MAX3241E are avail-
able in space-saving SO, SSOP, TQFN and TSSOP pac5-
ages. The MAX3237E is offered in an SSOP pac5age.
The MAX3246E is offered in the ultra-small 6 x 6 UꢁSP™
pac5age.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
Applications
ꢄatterꢅ-Powered Equipment Printers
Typical Operating Circuits appear at end of data sheet.
ꢁell Phones
ꢁell-Phone Data ꢁables
Smart Phones
xDSL Modems
MegaBaud and UCSP are trademarks of Maxim Integrated
Products, Inc.
†
Noteboo5, Subnoteboo5,
and Palmtop ꢁomputers
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 EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ABSOLUTE MAXIMUM RATINGS
ꢁꢁ
V
to ꢂND..............................................................-0.3V to +6V
18-Pin PDIP (derate 11.11mW/°ꢁ above +70°ꢁ)..........88±mW
20-Pin TQFN (derate 21.3mW/°ꢁ above +70°ꢁ) ........1702mW
20-Pin TSSOP (derate 10.±mW/°ꢁ above +70°ꢁ) ........87±mW
20-Pin SSOP (derate 8.00mW/°ꢁ above +70°ꢁ) ..........640mW
28-Pin SSOP (derate ±.ꢀ2mW/°ꢁ above +70°ꢁ) ..........762mW
28-Pin Wide SO (derate 12.ꢀ0mW/°ꢁ above +70°ꢁ).............1W
28-Pin TSSOP (derate 12.8mW/°ꢁ above +70°ꢁ) ......1026mW
32-Lead Thin QFN (derate 33.3mW/°ꢁ above +70°ꢁ)..2666mW
6 x 6 UꢁSP (derate 12.6mW/°ꢁ above +70°ꢁ).............1010mW
Operating Temperature Ranges
V+ to ꢂND (Note 1)..................................................-0.3V to +7V
V- to ꢂND (Note 1) ...................................................+0.3V to -7V
V+ + |V-| (Note 1).................................................................+13V
Input Voltages
T_IN, EN, SHDN, MꢄAUD to ꢂND ........................-0.3V to +6V
R_IN to ꢂND .....................................................................±2ꢀV
Output Voltages
T_OUT to ꢂND...............................................................±13.2V
R_OUT, R_OUTꢄ (MAX3241E)................-0.3V to (V
+ 0.3V)
ꢁꢁ
Short-ꢁircuit Duration, T_OUT to ꢂND.......................ꢁontinuous
MAX32_ _Eꢁ_ _ ...................................................0°ꢁ to +70°ꢁ
MAX32_ _EE_ _.................................................-40°ꢁ to +8ꢀ°ꢁ
Storage Temperature Range.............................-6ꢀ°ꢁ to +1ꢀ0°ꢁ
Lead Temperature (soldering, 10s) .................................+300°ꢁ
ꢄump Reflow Temperature (Note 2)
Infrared, 1ꢀs..................................................................+200°ꢁ
Vapor Phase, 20s..........................................................+21ꢀ°ꢁ
ꢁontinuous Power Dissipation (T = +70°ꢁ)
A
16-Pin SSOP (derate 7.14mW/°ꢁ above +70°ꢁ) ..........ꢀ71mW
16-Pin TSSOP (derate ±.4mW/°ꢁ above +70°ꢁ) .......7ꢀ4.7mW
16-Pin TQFN (derate 20.8mW/°ꢁ above +70°ꢁ) .....1666.7mW
16-Pin Wide SO (derate ±.ꢀ2mW/°ꢁ above +70°ꢁ) .....762mW
18-Pin Wide SO (derate ±.ꢀ2mW/°ꢁ above +70°ꢁ) .....762mW
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 pac5aging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rewor5. This limit permits onlꢅ the use of the solder profiles recom-
mended in the industrꢅ-standard specification, JEDEꢁ 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. ꢃand 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 +ꢀ.ꢀV, ꢁ1–ꢁ4 = 0.1µF, T = T
to T , unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Notes 3, 4)
MAX A
ꢁꢁ
A
MIN
PARAMETER
CONDITIONS
= +3.3V or +ꢀV, T = +2ꢀ°ꢁ)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
ꢁꢁ
A
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
0.3
1
Supplꢅ ꢁurrent
SHDN = V , no load
mA
ꢁꢁ
MAX3237E
0.ꢀ
1
2.0
10
SHDN = ꢂND
µA
nA
Shutdown Supplꢅ ꢁurrent
SHDN = R_IN = ꢂND, T_IN = ꢂND or V
(MAX3237E)
10
300
ꢁꢁ
LOGIC INPUTS
Input Logic Low
T_IN, EN, SHDN, MꢄAUD
0.8
V
V
V
V
V
= +3.3V
= +ꢀ.0V
2.0
2.4
ꢁꢁ
ꢁꢁ
Input Logic ꢃigh
T_IN, EN, SHDN, MꢄAUD
Transmitter Input ꢃꢅsteresis
0.ꢀ
±0.01
±
MAX3222E, MAX3232E,
MAX3241E, MAX3246E
T_IN, EN, SHDN
±1
18
Input Lea5age ꢁurrent
µA
T_IN, SHDN, MꢄAUD
MAX3237E (Note ꢀ)
RECEIVER OUTPUTS
R_OUT (MAX3222E/MAX3237E/MAX3241E/
MAX3246E), EN = V , receivers disabled
Output Lea5age ꢁurrent
±0.0ꢀ
±10
0.4
µA
V
ꢁꢁ
I
= 1.6mA (MAX3222E/MAX3232E/MAX3241E/
OUT
MAX3246E), I
Output Voltage Low
= 1.0mA (MAX3237E)
OUT
2
_______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V = +3V to +ꢀ.ꢀV, ꢁ1–ꢁ4 = 0.1µF, T = T
to T , unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Notes 3, 4)
MAX A
ꢁꢁ
A
MIN
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
0.6
-
V
0.1
-
ꢁꢁ
ꢁꢁ
Output Voltage ꢃigh
I
= -1.0mA
V
OUT
RECEIVER INPUTS
Input Voltage Range
-2ꢀ
0.6
0.8
+2ꢀ
V
V
V
V
V
V
= +3.3V
= +ꢀ.0V
= +3.3V
= +ꢀ.0V
1.1
1.ꢀ
1.ꢀ
2.0
0.ꢀ
ꢀ
ꢁꢁ
ꢁꢁ
ꢁꢁ
ꢁꢁ
Input Threshold Low
Input Threshold ꢃigh
T
T
= +2ꢀ°ꢁ
A
A
2.4
2.4
= +2ꢀ°ꢁ
= +2ꢀ°ꢁ
V
Input ꢃꢅsteresis
V
Input Resistance
T
3
7
5Ω
A
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
All transmitter outputs loaded with 35Ω to ground
±ꢀ
±ꢀ.4
ꢀ05
V
Ω
V
= 0, transmitter output = ±2V
300
ꢁꢁ
Output Short-ꢁircuit ꢁurrent
±60
±2ꢀ
mA
V
= 0 or +3.0V to +ꢀ.ꢀV, V
= ±12V, transmitters
ꢁꢁ
OUT
Output Lea5age ꢁurrent
µA
V
disabled (MAX3222E/MAX3232E/MAX3241E/MAX3246E)
MOUSE DRIVABILITY (MAX3241E)
T1IN = T2IN = ꢂND, T3IN = V , T3OUT loaded with
ꢁꢁ
35Ω to ꢂND, T1OUT and T2OUT loaded with 2.ꢀmA
Transmitter Output Voltage
±ꢀ
each
ESD PROTECTION
ꢃuman ꢄodꢅ Model
±1ꢀ
±1ꢀ
±8
IEꢁ 1000-4-2 Air-ꢂap Discharge (except MAX3237E)
IEꢁ 1000-4-2 ꢁontact Discharge (except MAX3237E)
IEꢁ 1000-4-2 ꢁontact Discharge (MAX3246E onlꢅ)
ꢃuman ꢄodꢅ Model
R_IN, T_OUT
5V
5V
±
±1ꢀ
±1ꢀ
±8
T_IN, R_IN, R_OUT, EN, SHDN,
MꢄAUD
MAX3237E
IEꢁ1000-4-2 Air-ꢂap Discharge
IEꢁ1000-4-2 ꢁontact Discharge
_______________________________________________________________________________________
3
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E
(V = +3V to +ꢀ.ꢀV, ꢁ1–ꢁ4 = 0.1µF, T = T
to T , unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Notes 3, 4)
MAX A
ꢁꢁ
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= T
MIN
2ꢀ0
2ꢀ0
TYP
MAX
UNITS
T
A
to T
MAX
MIN
R = 35Ω,
ꢁ = 1000pF,
L
L
(MAX3222E/MAX3232E/
MAX3241E)
Maximum Data Rate
5bps
one transmitter
switching
T = +2ꢀ°ꢁ (MAX3246E)
A
t
t
0.1ꢀ
0.1ꢀ
200
200
100
ꢀ0
PꢃL
Receiver input to receiver output,
ꢁ = 1ꢀ0pF
L
Receiver Propagation Delaꢅ
µs
PLꢃ
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter S5ew
Normal operation (except MAX3232E)
Normal operation (except MAX3232E)
(Note 6)
ns
ns
ns
ns
|t
|t
- t
|
|
PꢃL PLꢃ
Receiver S5ew
- t
PꢃL PLꢃ
V
ꢁꢁ
= +3.3V, T = +2ꢀ°ꢁ,
A
ꢁ = 1ꢀ0pF
L
to 1000pF
R = 35Ω to 75Ω, measured
from +3.0V to –3.0V or –3.0V to
L
Transition-Region Slew Rate
6
30
V/µs
+3.0V, one transmitter switching
TIMING CHARACTERISTICS—MAX3237E
(V
= +3V to +ꢀ.ꢀV, ꢁ1–ꢁ4 = 0.1µF, T = T
A
to T
, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.) (Note 3)
MAX A
ꢁꢁ
MIN
PARAMETER
CONDITIONS
R = 35Ω, ꢁ = 1000pF, one transmitter switching,
MIN
TYP
MAX
UNITS
L
L
2ꢀ0
MꢄAUD = ꢂND
V
= +3.0V to +4.ꢀV, R = 35Ω, ꢁ = 2ꢀ0pF,
ꢁꢁ
L
L
Maximum Data Rate
1000
1000
5bps
one transmitter switching, MꢄAUD = V
ꢁꢁ
V
= +4.ꢀV to +ꢀ.ꢀV, R = 35Ω, ꢁ = 1000pF,
ꢁꢁ
L
L
one transmitter switching, MꢄAUD = V
ꢁꢁ
t
t
0.1ꢀ
0.1ꢀ
2.6
PꢃL
Receiver Propagation Delaꢅ
R_IN to R_OUT, ꢁ = 1ꢀ0pF
L
µs
µs
PLꢃ
Receiver Output Enable Time
Receiver Output Disable Time
Normal operation
Normal operation
2.4
| t
| t
| t
V
- t
|, MꢄAUD = ꢂND (Note 6)
PꢃL PLꢃ
Transmitter S5ew
Receiver S5ew
100
ꢀ0
ns
ns
- t
|, MꢄAUD = V (Note 6)
ꢁꢁ
PꢃL PLꢃ
- t
|
PꢃL PLꢃ
= +3.3V,
MꢄAUD = ꢂND
MꢄAUD = V
6
30
ꢁꢁ
ꢁ = 1ꢀ0pF
L
to 1000pF
R = 35Ω to 75Ω,
L
24
1ꢀ0
ꢁꢁ
+3.0V to –3.0V or
-3.0V to +3.0V,
V/µs
Transition-Region Slew Rate
ꢁ = 1ꢀ0pF to 2ꢀ00pF,
L
MꢄAUD = ꢂND
4
30
T
A
= +2ꢀ°ꢁ
Note 3:MAX3222E/MAX3232E/MAX3241E: ꢁ1–ꢁ4 = 0.1µF tested at +3.3V ±10ꢆ% ꢁ1 = 0.047µF, ꢁ2, ꢁ3, ꢁ4 = 0.33µF tested at +ꢀ.0V
±10ꢆ. MAX3237E: ꢁ1–ꢁ4 = 0.1µF tested at +3.3V ±ꢀꢆ, ꢁ1–ꢁ4 = 0.22µF tested at +3.3V ±10ꢆ% ꢁ1 = 0.047µF, ꢁ2, ꢁ3, ꢁ4 =
0.33µF tested at +ꢀ.0V ±10ꢆ. MAX3246E% ꢁ1-ꢁ4 = 0.22µF tested at +3.3V ±10ꢆ% ꢁ1 = 0.22µF, ꢁ2, ꢁ3, ꢁ4 = 0.ꢀ4µF tested at
ꢀ.0V ±10ꢆ.
Note 4:MAX3246E devices are production tested at +2ꢀ°ꢁ. All limits are guaranteed bꢅ design over the operating temperature range.
Note 5:The MAX3237E logic inputs have an active positive feedbac5 resistor. The input current goes to zero when the inputs are at
the supplꢅ rails.
Note 6: Transmitter s5ew is measured at the transmitter zero crosspoints.
4
_______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
__________________________________________Typical Operating Characteristics
(V
= +3.3V, 2ꢀ05bps data rate, 0.1µF capacitors, all transmitters loaded with 35Ω and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)
ꢁꢁ
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
4 TRANSMITTERS 15.6kbps
ALL TRANSMITTERS LOADED
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C LOAD, EACH OUTPUT
1
WITH 3kΩ + C
L
0
0
L
-1
-2
-3
-1
-2
-3
-4
-5
-6
WITH 3kΩ + C
L
-2.5
-5.0
-7.5
1.5Mbps
1Mbps
2Mbps
-4
-5
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 EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
Typical Operating Characteristics (continued)
(V
= +3.3V, 2ꢀ05bps data rate, 0.1µF capacitors, all transmitters loaded with 35Ω and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)
L A
ꢁꢁ
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
3kΩ + C LOAD EACH OUTPUT
WITH 3kΩ + C
L
L
WITH 3kΩ + 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 3kΩ +1000pF
1
0
-1
-2
-3
-4
-5
-6
20
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ 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 3kΩ + 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 EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂin Description
PIN
MAX3222E
SO/ TSSOP/
MAX3232E
MAX3241E
SO/DIP/
SSOP/
NAME
FUNCTION
MAX3237E
MAX3246E
20-PIN
SSOP/
QFN
SO
TQFN
TQFN
DIP SSOP
16-PIN TSSOP
TSSOP
Receiver Enable. Active
1±
1
1
2
1
2
—
—
—
13*
28
23
28
22
28
ꢄ3
F3
EN
Positive Terminal of
Voltage-Doubler ꢁharge-
Pump ꢁapacitor
16
1
2
ꢁ1+
+ꢀ.ꢀV ꢂenerated bꢅ the
ꢁharge Pump
20
2
3
4
3
4
1ꢀ
1
2
3
3
4
27
2ꢀ
27
24
27
23
F1
F4
V+
Negative Terminal of
Voltage-Doubler ꢁharge-
Pump ꢁapacitor
ꢁ1-
Positive Terminal of
Inverting ꢁharge-Pump
ꢁapacitor
3
ꢀ
ꢀ
2
4
ꢀ
1
1
2±
E1
ꢁ2+
Negative Terminal of
Inverting ꢁharge-Pump
ꢁapacitor
4
ꢀ
6
7
6
7
3
4
ꢀ
6
6
7
3
4
2
3
30
31
D1
ꢁ1
ꢁ2-
V-
-ꢀ.ꢀV ꢂenerated bꢅ the
ꢁharge Pump
±,
10,
11
6,
7,
8
8,
1ꢀ
ꢀ,
12
ꢀ, 6, 7,
10, 12
F6, E6,
D6
RS-232 Transmitter
Outputs
6, 1ꢀ
8, 17
7, 14
8, 17
T_OUT
A4, Aꢀ,
A6, ꢄ6,
ꢁ6
±,
6,
7, 14
8, 13
±, 16
10, 1ꢀ
12, 13
8, 13
±, 12
±, 16
8, ±, 11
4–8
1–ꢀ
R_IN
R_OUT
T_IN
RS-232 Receiver Inputs
14
11
13,
14,
1ꢀ,
ꢁ2, ꢄ1,
A1, A2,
A3
10,
13
7,
10
12,
1ꢀ
18, 20,
21
TTL/ꢁMOS Receiver
Outputs
1ꢀ–1±
17, 18
17*, 1±*,
22*, 23*,
24*
10,
11,
12
12,
13,
14
11,
12
13,
14
E3, E2,
D2
TTL/ꢁMOS Transmitter
Inputs
10, 11
8, ±
10, 11
*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
_______________________________________________________________________________________
7
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂin Description (continued)
PIN
MAX3222E
SO/ TSSOP/
MAX3232E
MAX3241E
SSOP/
SO/DIP/
SSOP/
16-PIN
TSSOP
NAME
FUNCTION
MAX3237E
MAX3246E
20-PIN
TSSOP
TQFN
TQFN
SO/
QFN
DIP SSOP
TSSOP
16
17
16
17
18
1±
13
14
1ꢀ
18
1±
2
2ꢀ
26
24
26
Fꢀ
F2
ꢂND
ꢂround
+3.0V to +ꢀ.ꢀV Supplꢅ
Voltage
V
16
26
ꢁꢁ
Shutdown ꢁontrol. Active
low.
18
18
—
20
—
—
—
—
—
14*
—
22
—
21
ꢄ2
SHDN
No ꢁonnection. For
MAX3246E, these
locations are not
populated with solder
bumps.
ꢁ3, D3, ꢄ4,
ꢁ4, D4, E4,
ꢄꢀ, ꢁꢀ, Dꢀ,
Eꢀ
±, 16,
2ꢀ,
32
1, 10,
11, 20
±, 12
11, 14
N.ꢁ.
Megaꢄaud ꢁontrol Input.
ꢁonnect to ꢂND for
normal operation% connect
—
—
—
—
—
—
1ꢀ*
—
—
—
MꢄAUD
to V
for 1Mbps
ꢁꢁ
transmission rates.
Noninverting
ꢁomplementarꢅ Receiver
Outputs. Alwaꢅs active.
20,
21
—
—
—
—
—
—
—
—
—
—
16
—
1±, 20
EP
—
—
R_OUTꢄ
ꢂND
Exposed Paddle. Solder
the exposed paddle to
the ground alone or leave
unconnected.
EP
EP
—
8
_______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
V
V
CC
CC
0.1µF
0.1µF
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
5kΩ
5kΩ
1000pF
(2500pF, MAX3237E only)
7kΩ
150pF
3kΩ
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 = ꢂND). The MAX3222E/
MAX3232E/MAX3237E/MAX3241E/MAX3246E permit
the outputs to be driven up to ±12V in shutdown.
Detailed Description
Dual Charge-ꢂump koltage Converter
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246Es’ internal power supplꢅ consists of a regu-
lated dual charge pump that provides output voltages
of +ꢀ.ꢀV (doubling charge pump) and -ꢀ.ꢀV (inverting
The MAX3222E/MAX3232E/MAX3241E/MAX3246E
transmitter inputs do not have pullup resistors. ꢁonnect
unused inputs to ꢂND or V . The MAX3237E’s trans-
ꢁꢁ
charge pump) over the +3.0V to +ꢀ.ꢀV V
range. The
ꢁꢁ
mitter inputs have a 4005Ω active positive-feedbac5
charge pump operates in discontinuous mode% if the
output voltages are less than ꢀ.ꢀV, the charge pump is
enabled, and if the output voltages exceed ꢀ.ꢀV, the
charge pump is disabled. Each charge pump requires
a flꢅing capacitor (ꢁ1, ꢁ2) and a reservoir capacitor
(ꢁ3, ꢁ4) to generate the V+ and V- supplies (Figure 1).
resistor, allowing unused inputs to be left unconnected.
MAX3237E MegaBaud Operation
For higher-speed serial communications, the
MAX3237E features Megaꢄaud operation. In
Megaꢄaud operating mode (MꢄAUD = V ), the
ꢁꢁ
MAX3237E transmitters guarantee a 1Mbps data rate
Rꢁ-232 Transmitters
The transmitters are inverting level translators that con-
vert TTL/ꢁMOS-logic levels to ±ꢀV EIA/TIA-232-compli-
ant levels.
with worst-case loads of 35Ω in parallel with 2ꢀ0pF for
+3.0V < V
< +4.ꢀV. For +ꢀV ±10ꢆ operation, the
ꢁꢁ
MAX3237E transmitters guarantee a 1Mbps data rate
into worst-case loads of 35Ω in parallel with 1000pF.
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E transmitters guarantee a 2ꢀ05bps data rate
with worst-case loads of 35Ω in parallel with 1000pF,
providing compatibilitꢅ with Pꢁ-to-Pꢁ communication
software (such as LapLin5™). Transmitters can be par-
alleled to drive multiple receivers or mice.
Rꢁ-232 Receivers
The receivers convert RS-232 signals to ꢁMOS-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.
_______________________________________________________________________________________
9
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
V
CC
5V/div
0
SHDN
T2OUT
PREVIOUS
RS-232
V
CC
PROTECTION
2V/div
0
DIODE
Rx
5kΩ
UART
T1OUT
Tx
V
CC
= 3.3V
GND
C1–C4 = 0.1µF
SHDN = GND
40µs/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
µP
MAX3222E/MAX3237E/MAX3241E/
MAX3246E ꢁhutdown Mode
Supplꢅ current falls to less than 1µA in shutdown mode
(SHDN = low). The MAX3237E’s supplꢅ current falls
to10nA (tꢅp) 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-
ꢁꢁ
puts are disabled (high impedance). The time required
to recover from shutdown is tꢅpicallꢅ 100µs, as shown
LOGIC
TRANSITION
DETECTOR
MAX3237E/MAX3241E
R1OUTB
V
CC
PROTECTION
DIODE
R1IN
Rx
R1OUT
THREE-STATED
in Figure 3. ꢁonnect SHDN to V
if shutdown mode is
ꢁꢁ
EN = V
CC
5kΩ
not used. SHDN has no effect on R_OUT or R_OUTꢄ
UART
(MAX3237E/MAX3241E).
T1OUT
T1IN
Tx
1ꢀ5k EꢁD ꢂrotection
As with all Maxim devices, ESD-protection structures
are incorporated to protect against electrostatic dis-
charges encountered during handling and assemblꢅ.
The driver outputs and receiver inputs of the
MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E
have extra protection against static electricitꢅ. Maxim’s
engineers have developed state-of-the-art structures to
protect these pins against ESD of ±1ꢀ5V 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 5eep wor5ing 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 complementarꢅ outputs on the MAX3237E/
MAX3241E (R_OUTꢄ) are alwaꢅs 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 sꢅstems where V
to accommodate peripherals such as UARTs (Figure 2).
Furthermore, the MAX3237E logic I/O pins also have
±1ꢀ5V ESD protection. Protecting the logic I/O pins to
±1ꢀ5V ma5es the MAX3237E ideal for data cable
applications.
drops to zero in shutdown
ꢁꢁ
10 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ESD protection can be tested in various waꢅs% 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:
• ±1ꢀ5V using the ꢃuman ꢄodꢅ Model
R_OUTB
(MAX3237E/
MAX3241E)
SHDN
EN
T_OUT
R_OUT
• ±85V using the ꢁontact Discharge method specified
in IEꢁ 1000-4-2
0
0
1
1
0
1
0
1
ꢃigh-Z
ꢃigh-Z
Active
Active
Active
ꢃigh-Z
Active
ꢃigh-Z
Active
Active
Active
Active
• ±±5V (MAX3246E onlꢅ) using the ꢁontact Discharge
method specified in IEꢁ 1000-4-2
• ±1ꢀ5V using the Air-ꢂap Discharge method speci-
fied in IEꢁ 1000-4-2
R
R
C
D
1MΩ
1500Ω
DISCHARGE
RESISTANCE
I
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
CHARGE-CURRENT
LIMIT RESISTOR
I
P
r
HIGH-
VOLTAGE
DC
AMPERES
DEVICE
UNDER
TEST
C
100pF
STORAGE
CAPACITOR
s
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
330Ω
C
90%
50MΩ to 100MΩ
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
______________________________________________________________________________________ 11
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
Table 2. Required Minimum Capacitor
Values
6
5
VCC
(V)
C1
(µF)
C2, C3, C4
(µF)
V
OUT+
4
3
V
CC
= 3.0V
2
MAX3222E/MAX3232E/MAX3241E
V
V
1
OUT+
3.0 to 3.6
4.ꢀ to ꢀ.ꢀ
0.1
0.047
0.1
0.1
0
0.33
0.47
-1
-2
-3
-4
-5
-6
3.0 to ꢀ.ꢀ
V
CC
1
OUT-
MAX3237E/MAX3246E
3.0 to 3.6
V
OUT-
0.22
0.1
0.22
0.1
3.1ꢀ to 3.6
0
2
3
4
5
6
7
8
9
10
4.ꢀ to ꢀ.ꢀ
0.047
0.22
0.33
1.0
LOAD CURRENT PER TRANSMITTER (mA)
3.0 to ꢀ.ꢀ
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current Per Transmitter
Table 3. Logic-Family Compatibility with
Various Supply Voltages
IEC 1000-4-2
SYSTEM
V
CC
SUPPLY
VOLTAGE
(V)
The IEꢁ 1000-4-2 standard covers ESD testing and
performance of finished equipment% it does not specifi-
callꢅ refer to integrated circuits. The MAX3222E/
MAX3232E/MAX3237E/MAX3241E/MAX3246E help ꢅou
design equipment that meets level 4 (the highest level)
of IEꢁ 1000-4-2, without the need for additional ESD-
protection components.
POWER-SUPPLY
VOLTAGE
(V)
COMPATIBILITY
ꢁompatible with all
ꢁMOS families
3.3
ꢀ
3.3
ꢀ
ꢁompatible with all
TTL and ꢁMOS
families
The major difference between tests done using the
ꢃuman ꢄodꢅ Model and IEꢁ 1000-4-2 is higher pea5
current in IEꢁ 1000-4-2, because series resistance is
lower in the IEꢁ 1000-4-2 model. ꢃence, the ESD with-
stand voltage measured to IEꢁ 1000-4-2 is generallꢅ
lower than that measured using the ꢃuman ꢄodꢅ
Model. Figure ꢀa shows the IEꢁ 1000-4-2 model, and
Figure ꢀb shows the current waveform for the ±85V IEꢁ
1000-4-2 level 4 ESD ꢁontact Discharge test. The Air-
ꢂap Discharge test involves approaching the device
with a charged probe. The ꢁontact Discharge method
connects the probe to the device before the probe is
energized.
ꢁompatible with AꢁT
and ꢃꢁT ꢁMOS, and
with Aꢁ, ꢃꢁ, or
ꢀ
3.3
ꢁD4000 ꢁMOS
For the MAX3237E, all logic and RS-232 I/O pins are
characterized for protection to ±1ꢀ5V per the ꢃuman
ꢄodꢅ Model.
EꢁD Test Conditions
ESD performance depends on a varietꢅ of conditions.
ꢁontact Maxim for a reliabilitꢅ report that documents
test setup, test methodologꢅ, 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 bꢅ
contact that occurs with handling and assemblꢅ during
manufacturing. All pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
Therefore, after Pꢁ board assemblꢅ, the Machine
Model is less relevant to I/O ports.
Human Body Model
Figure 4a shows the ꢃuman ꢄodꢅ 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.ꢀ5Ω resistor.
12 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
V
CC
= +3.0V TO +5.5V
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
5kΩ
18
17
16
R2OUT
R3OUT
5kΩ
5kΩ
5kΩ
5kΩ
7
R4OUT
R5OUT
EN
MOUSE
15
23
R5IN
8
22
SHDN
V
CC
GND
25
Figure 6b. Mouse Driver Test Circuit
excessivelꢅ with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usuallꢅ rises at low
temperatures, influences the amount of ripple on V+
and V-.
Applications Information
Capacitor ꢁelection
The capacitor tꢅpe used for ꢁ1–ꢁ4 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 supplꢅ 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., bꢅ a factor of 2) reduces ripple
on the transmitter outputs and slightlꢅ reduces power
consumption. ꢁ2, ꢁ3, and ꢁ4 can be increased without
changing ꢁ1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
ꢂower-ꢁupply Decoupling
In most circumstances, a 0.1µF V
bꢅpass capacitor
ꢁꢁ
is adequate. In applications sensitive to power-supplꢅ
noise, use a capacitor of the same value as charge-
pump capacitor ꢁ1. ꢁonnect bꢅpass capacitors as
close to the Iꢁ as possible.
Operation Down to 2.7k
Transmitter outputs meet EIA/TIA-ꢀ62 levels of ±3.7V
with supplꢅ 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,
ma5e sure the capacitor value does not degrade
______________________________________________________________________________________ 13
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
the transmitters are enabled onlꢅ when the magnitude
of V- exceeds approximatelꢅ -3.0V.
Transmitter Outputs Recovering
from ꢁhutdown
Figure 3 shows two transmitter outputs recovering from
shutdown mode. As theꢅ 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 35Ω in parallel with 2ꢀ00pF.
The transmitter outputs displaꢅ no ringing or undesir-
able transients as theꢅ 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 successfullꢅ drove all serial mice tested
and met their current and voltage requirements.
V
CC
0.1µF
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
CC
= 3.3V, C1–C4 = 0.1µF
T_ OUT
T_ IN
2µs/div
R_ IN
R_ OUT
Figure 9. MAX3241E Loopback Test Result at 250kbps
5kΩ
1000pF
GND
+5V
T_IN
0
Figure 7. Loopback Test Circuit
+5V
0
-5V
+5V
0
T_OUT
5kΩ + 250pF
V
= 3.3V
CC
C1–C4 = 0.1µF
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
CC
= 3.3V
C1–C4 = 0.1µF
2µs/div
Figure 8. MAX3241E Loopback Test Result at 120kbps
14 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
Figure 6a shows the transmitter output voltages under
increasing load current at +3.0V. Figure 6b shows a
tꢅpical mouse connection using the MAX3241E.
UCꢁꢂ Reliability
The UꢁSP represents a unique pac5aging form factor
that maꢅ not perform equallꢅ to a pac5aged product
through traditional mechanical reliabilitꢅ tests. UꢁSP
reliabilitꢅ is integrallꢅ lin5ed to the user’s assemblꢅ
methods, circuit board material, and usage environ-
ment. The user should closelꢅ review these areas when
considering use of a UꢁSP pac5age. Performance
through Operating Life Test and Moisture Resistance
remains uncompromised as the wafer-fabrication
process primarilꢅ determines it.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E maintain the RS-232 ±ꢀV minimum transmit-
ter output voltage even at high data rates. Figure 7
shows a transmitter loopbac5 test circuit. Figure 8
shows a loopbac5 test result at 1205bps, and Figure ±
shows the same test at 2ꢀ05bps. For Figure 8, all trans-
mitters were driven simultaneouslꢅ at 1205bps into RS-
232 loads in parallel with 1000pF. For Figure ±, a single
transmitter was driven at 2ꢀ05bps, and all transmitters
were loaded with an RS-232 receiver in parallel with
1000pF.
Mechanical stress performance is a greater considera-
tion for a UꢁSP pac5age. UꢁSPs are attached through
direct solder contact to the user’s Pꢁ board, foregoing
the inherent stress relief of a pac5aged product lead
frame. Solder joint contact integritꢅ must be consid-
ered. Table 4 shows the testing done to characterize
the UꢁSP reliabilitꢅ performance. In conclusion, the
UꢁSP is capable of performing reliablꢅ through envi-
ronmental stresses as indicated bꢅ the results in the
table. Additional usage data and recommendations are
detailed in the UꢁSP application note, which can be
found on Maxim’s website at www.maxim-ic.com.
The MAX3237E maintains the RS-232 ±ꢀ.0V minimum
transmitter output voltage at data rates up to 1Mbps.
Figure 10 shows a loopbac5 test result at 1Mbps with
MꢄAUD = V . For Figure 10, all transmitters were
ꢁꢁ
loaded with an RS-232 receiver in parallel with 2ꢀ0pF.
Interconnection with 3k and ꢀk Logic
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E can directlꢅ interface with various ꢀV logic
families, including AꢁT and ꢃꢁT ꢁMOS. 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
A
T
A
= -3ꢀ°ꢁ to +8ꢀ°ꢁ,
= -40°ꢁ to +100°ꢁ
1ꢀ0 cꢅcles,
±00 cꢅcles
0/10,
0/200
Temperature ꢁꢅcle
Operating Life
T
T
T
T
= +70°ꢁ
240 hours
240 hours
240 hours
24 hours
—
0/10
0/10
0/10
0/10
0/1ꢀ
0/ꢀ
A
A
A
A
Moisture Resistance
Low-Temperature Storage
Low-Temperature Operational
Solderabilitꢅ
= +20°ꢁ to +60°ꢁ, ±0ꢆ Rꢃ
= -20°ꢁ
= -10°ꢁ
8-hour steam age
ESD
1ꢀ5V, ꢃuman ꢄodꢅ Model
—
ꢃigh-Temperature Operating
Life
T = +1ꢀ0°ꢁ
J
168 hours
0/4ꢀ
______________________________________________________________________________________ 15
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
__________________________________________________________ꢂin 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
CC
V
CC
GND
V
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
SO/DIP/SSOP/TSSOP
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
16 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂin Configurations (continued)
TOP VIEW
TOP VIEW
15
14
13
12
11
12
11
10
9
T2IN
N.C.
10
9
GND 16
17
SHDN 18
T2IN
8
7
6
5
GND 13
V
CC
V
14
15
16
R2OUT
R2IN
CC
8
R2OUT
R2IN
MAX3222E
MAX3232E
V+
EN
7
19
20
EXPOSED
PADDLE
EXPOSED
PADDLE
T2OUT
C1+
6
T2OUT
V+
1
2
3
4
5
1
2
3
4
TQFN
TQFN
TOP VIEW
(BUMPS ON BOTTOM)
B2: SHDN
C2: R1OUT
D2: T3IN
E2: T2IN
B3: EN
R4OUT R5OUT
R1IN
A4
R2IN
A5
A1
A2
B2
C2
D2
E2
F2
A3
A6 R3IN
R3OUT
E3: T1IN
BUMPS B4, B5, C3, C4,
C5, D3, D4, D5, E4, AND
E5 NOT POPULATED
R2OUT B1
B3
B6 R4IN
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
______________________________________________________________________________________ 17
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 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
0.1µF
C1
0.1µF
C3*
C3*
0.1µF
0.1µF
C1-
C2+
C1-
C2+
MAX3222E
MAX3232E
V-
V-
C2
0.1µF
C2
0.1µF
C4
0.1µF
C4
0.1µF
C2-
C2-
12
T1OUT
T1IN
15
8
11
T1OUT
T1IN
14
7
TTL/CMOS
INPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
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
5kΩ
RS-232
INPUTS
5kΩ
R2IN
9
R2OUT
R2IN
5kΩ
5kΩ
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.
MAX3222E PINOUT REFERS TO SO/DIP PACKAGES.
MAX3232E PINOUT REFERS TO TSSOP/SSOP/SO/DIP/ PACKAGES
SEE TABLE 2 FOR CAPACITOR SELECTION.
18 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
_____________________________________Typical Operating Circuits (continued)
+3.3V
+3.3V
C
C
BYPASS
BYPASS
26
26
V
V
CC
CC
27
4
27
3
28
28
C1+
C1+
V+
V-
V+
C1
0.1µF
C3*
0.1µF
C3*
25
1
24
1
0.1µF
C1-
C2+
C1-
C2+
0.1µF
MAX3237E
MAX3241E
V-
C2
0.1µF
0.1µF
0.1µF
C4
0.1µF
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
OUTPUTS
T3OUT
R1IN
LOGIC
INPUTS
T3
T4
T5
R1OUTB
T4IN
T5IN
T4OUT 10
19
17
R2OUTB
R1OUT
20
19
12
T5OUT
R1IN
4
5
R1OUTB
R1OUT
16
21
5kΩ
R2OUT
R3OUT
R4OUT
R2IN
18
17
16
8
9
R1
R2
R3
5kΩ
TTL/CMOS
OUTPUTS
5kΩ
R2IN
6
7
8
R3IN
RS-232
INPUTS
RS-232
INPUTS
R2OUT
R3OUT
20
18
LOGIC
5kΩ
OUTPUTS
5kΩ
R3IN
R4IN
11
5kΩ
5kΩ
R5OUT
EN
15
23
R5IN
15
14
5kΩ
MBAUD
SHDN
EN
13
22
SHDN
GND
2
GND
25
*C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
______________________________________________________________________________________ 19
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
_____________________________________Typical Operating Circuits (continued)
+3.3V
C
BYPASS
F2
V
CC
F1
F3
C1+
V+
V-
C1
0.1µF
C3*
F4
E1
D1
C1-
C2+
0.1µF
MAX3246E
C1
C2
0.1µF
C4
0.1µF
C2-
T1IN
T1OUT F6
T2OUT E6
E3
E2 T2IN
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T3IN
D2
C2
D6
A4
T3OUT
R1OUT
R1IN
5kΩ
R2OUT
R3OUT
R4OUT
R2IN A5
B1
A1
A2
5kΩ
R3IN
TTL/CMOS
OUTPUTS
A6
B6
RS-232
INPUTS
5kΩ
R4IN
5kΩ
R5IN C6
5kΩ
SHDN
R5OUT
EN
A3
B3
B2
GND
F5
*C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
20 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢁelector Guide
Ordering Information (continued)
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
PIN-
PKG
CODE
LOW-POWER
SHUTDOWN
PART
TEMP RANGE
PACKAGE
PART
16 Thin QFN-
MAX3232EꢁTE
0°ꢁ to +70°ꢁ EP** (ꢀmm x
ꢀmm)
T16ꢀꢀ-2
MAX3222E
MAX3232E
2/2
2/2
✔
2ꢀ05
2ꢀ05
—
MAX3232EꢁUE
MAX3232EꢁUP
MAX3232EEAE
MAX3232EEWE
MAX3232EEPE
0°ꢁ to +70°ꢁ 16 TSSOP
0°ꢁ to +70°ꢁ 20 TSSOP
-40°ꢁ to +8ꢀ°ꢁ 16 SSOP
-40°ꢁ to +8ꢀ°ꢁ 16 Wide SO
-40°ꢁ to +8ꢀ°ꢁ 16 Plastic DIP
16 Thin QFN-
—
—
—
—
—
MAX3237E
(Normal)
ꢀ/3
ꢀ/3
✔
✔
2ꢀ05
1M
MAX3237E
(Megaꢄaud)
MAX3241E
MAX3246E
3/ꢀ
3/ꢀ
✔
✔
2ꢀ05
2ꢀ05
EP** (ꢀmm x
ꢀmm)
MAX3232EETE
-40°ꢁ to +8ꢀ°ꢁ
T16ꢀꢀ-2
MAX3232EEUE
MAX3232EEUP
MAX3237EꢁAI
MAX3237EEAI
MAX3241EꢁAI
MAX3241EꢁWI
MAX3241EꢁUI
MAX3241EꢁTJ
MAX3241EEAI
MAX3241EEWI
MAX3241EEUI
-40°ꢁ to +8ꢀ°ꢁ 16 TSSOP
-40°ꢁ to +8ꢀ°ꢁ 20 TSSOP
0°ꢁ to +70°ꢁ 28 SSOP
-40°ꢁ to +8ꢀ°ꢁ 28 SSOP
0°ꢁ to +70°ꢁ 28 SSOP
0°ꢁ to +70°ꢁ 28 Wide SO
0°ꢁ to +70°ꢁ 28 TSSOP
0°ꢁ to +70°ꢁ 32 Thin QFN
-40°ꢁ to +8ꢀ°ꢁ 28 SSOP
-40°ꢁ to +8ꢀ°ꢁ 28 Wide SO
-40°ꢁ to +8ꢀ°ꢁ 28 TSSOP
—
—
—
—
—
—
—
—
—
—
—
—
—
___________________Chip Information
TRANSISTOR ꢁOUNT:
MAX3222E/MAX3232E: 112±
MAX3237E: 2110
MAX3241E: 133ꢀ
MAX3246E: 842
PROꢁESS: ꢄIꢁMOS
MAX3246EꢁꢄX-T 0°ꢁ to +70°ꢁ 6 x 6 UꢁSP*
MAX3246EEꢄX-T -40°ꢁ to +8ꢀ°ꢁ 6 x 6 UꢁSP*
*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.
______________________________________________________________________________________ 21
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂac5age Information
(The pac5age drawing(s) in this data sheet maꢅ not reflect the most current specifications. For the latest pac5age outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE,
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
1
E
21-0139
2
PACKAGE OUTLINE,
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
2
E
21-0139
2
22 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂac5age Information
(The pac5age drawing(s) in this data sheet maꢅ not reflect the most current specifications. For the latest pac5age outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, TSSOP 4.40mm BODY
1
21-0066
G
1
______________________________________________________________________________________ 23
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂac5age Information (continued)
(The pac5age drawing(s) in this data sheet maꢅ not reflect the most current specifications. For the latest pac5age outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 6x6 UCSP
1
21-0082
J
1
24 ______________________________________________________________________________________
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂac5age Information (continued)
(The pac5age drawing(s) in this data sheet maꢅ not reflect the most current specifications. For the latest pac5age outline information,
go to www.maxim-ic.com/packages.)
INCHES
MILLIMETERS
N
MAX
MAX
2.65
0.30
0.49
0.32
DIM
A
MIN
MIN
2.35
0.10
0.35
0.23
0.093
0.004
0.014
0.009
0.104
0.012
0.019
0.013
A1
B
C
e
0.050
1.27
H
E
E
0.291
0.394
0.016
0.299
0.419
0.050
7.40
10.00
0.40
7.60
10.65
1.27
H
L
VARIATIONS:
INCHES
1
MILLIMETERS
TOP VIEW
DIM
D
MIN
MAX
0.413
0.463
0.512
0.614
0.713
MIN
10.10
11.35
12.60
15.20
17.70
MAX
N MS013
0.398
0.447
0.496
0.598
0.697
10.50 16 AA
11.75 18 AB
13.00 20 AC
15.60 24 AD
18.10 28 AE
D
D
D
D
D
C
A
B
e
0∞-8∞
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .300" SOIC
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0042
B
1
______________________________________________________________________________________ 25
1ꢀ5k EꢁD-ꢂrotected, Down to 10nA, 3.0k to ꢀ.ꢀk,
Up to 1Mbps, True Rꢁ-232 Transceivers
ꢂac5age Information (continued)
(The pac5age drawing(s) in this data sheet maꢅ not reflect the most current specifications. For the latest pac5age outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, TSSOP 4.40mm BODY
1
21-0066
G
1
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.
26 ____________________Maxim Integrated ꢂroducts, 120 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408-737-7600
© 200ꢀ Maxim Integrated Products
Printed USA
is a registered trademar5 of Maxim Integrated Products, Inc.
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