MAXIM MAX3222, MAX3232, MAX3237, MAX3241 User Manual

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_______________General Description

The MAX3222/MAX3232/MAX3237/MAX3241 trans­ceivers have a proprietary low-dropout transmitter out­put stage enabling true RS-232 performance from a

3.0V to 5.5V supply with a dual charge pump. The
devices require only four small 0.1µF external charge­pump capacitors. The MAX3222, MAX3232, and
MAX3241 are guaranteed to run at data rates of
120kbps while maintaining RS-232 output levels. The
MAX3237 is guaranteed to run at data rates of 250kbps
in the normal operating mode and 1Mbps in the
MegaBaud™ operating mode, while maintaining RS-232
output levels.

The MAX3222/MAX3232 have 2 receivers and 2
drivers. The MAX3222 features a 1µA shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers remain active in
shutdown mode, allowing external devices such as
modems to be monitored using only 1µA supply cur­rent. The MAX3222 and MAX3232 are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.

The MAX3241 is a complete serial port (3 drivers/
5 receivers) designed for notebook and subnotebook
computers. The MAX3237 (5 drivers/3 receivers) is ideal
for fast modem applications. Both these devices feature
a shutdown mode in which all receivers can remain
active while using only 1µA supply current. Receivers R1
(MAX3237/MAX3241) and R2 (MAX3241) have extra out­puts in addition to their standard outputs. These extra
outputs are always active, allowing external devices
such as a modem to be monitored without forward bias­ing the protection diodes in circuitry that may have V

CC

completely removed.
The MAX3222, MAX3237, and MAX3241 are available

in space-saving TSSOP and SSOP packages.

________________________Applications

Notebook, Subnotebook, and Palmtop Computers
High-Speed Modems
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers

____________________________Features

♦ Low Supply Current:

300µA (MAX3222/MAX3232/MAX3241)
500µA (MAX3237)

♦ Guaranteed Data Rate:

120kbps (MAX3222/MAX3232/MAX3241)
250kbps (MAX3237—Normal Operation)
1Mbps (MAX3237—MegaBaud Operation)

♦ 1µA Low-Power Shutdown with Receivers Active

(MAX3222/MAX3237/MAX3241)

♦ Flow-Through Pinout (MAX3237)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed Mouse Driveability (MAX3241)
♦ Pin Compatible with Industry-Standard MAX232

(MAX3232)
Pin Compatible with Industry-Standard MAX242
(MAX3222)

♦ Guaranteed Slew Rate:

6V/µs (MAX3222/MAX3232/MAX3237/MAX3241)
24V/µs (MAX3237—MegaBaud Operation)

MAX3222/MAX3232/MAX3237/MAX3241*

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

________________________________________________________________

Maxim Integrated Products

1

18
17
16
15
14
13
12
11

1
2
3
4
5
6
7
8

SHDN
V

CC

GND
T1OUT

C1-

V+

C1+

EN

TOP VIEW

R1IN
R1OUT
T1IN
T2IN

T2OUT

V-

C2-

C2+

10

9

R2OUTR2IN

DIP/SO

MAX3222

_________________Pin Configurations

______________Ordering Information

19-0273; Rev 5; 3/99

PART TEMP. RANGE PIN-PACKAGE

MegaBaud is a trademark of Maxim Integrated Products.
*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.

Typical Operating Circuits appear at end of data sheet.

Pin Configurations continued at end of data sheet.

Ordering Information continued at end of data sheet.

MAX3222CUP

0°C to +70°C 20 TSSOP
MAX3222CAP 0°C to +70°C 20 SSOP
MAX3222CWN 0°C to +70°C 18 SO
MAX3222CPN 0°C to +70°C 18 Plastic DIP

VCC= 5.0V

MAX3222/MAX3232/MAX3237/MAX3241

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

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.

Note 1: V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.

V

CC

...........................................................................-0.3V to +6V

V+ (Note 1)...............................................................-0.3V to +7V

V- (Note 1)................................................................+0.3V to -7V

V+ + V- (Note 1)...................................................................+13V

Input Voltages

T_IN,

SHDN, EN ...................................................-0.3V to +6V

MBAUD...................................................-0.3V to (V

CC

+ 0.3V)

R_IN.................................................................................±25V

Output Voltages

T_OUT...........................................................................±13.2V

R_OUT....................................................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration

T_OUT....................................................................Continuous

Continuous Power Dissipation (T

A

= +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW

16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW

16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW

16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW

18-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ..889mW

18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW

20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW

20-Pin TSSOP (derate 7.0mW/°C above +70°C).............559mW

28-Pin SO (derate 12.50mW/°C above +70°C).....................1W

28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW

28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW

Operating Temperature Ranges

MAX32_ _C_ _.....................................................0°C to +70°C

MAX32_ _E_ _ .................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10sec).............................+300°C

I

OUT

= -1.0mA

I

OUT

= 1.6mA

Receivers disabled

T_IN, EN, SHDN, MBAUD

T_IN, EN, SHDN, MBAUD

CONDITIONS

V

0.8 1.5

Input Threshold Low

0.6 1.2

V-25 25Input Voltage Range

0.5 2.0

VCCPower-Supply Current

VVCC- 0.6 VCC- 0.1Output Voltage High

V0.4Output Voltage Low

µA±0.05 ±10Output Leakage Current

µA±0.01 ±1.0Input Leakage Current

V0.8

Input Logic Threshold Low
(Note 3)

UNITS

MIN TYP MAX

PARAMETER

TA= +25°C

TA= +25°C

V

1.8 2.4

Input Threshold High

1.5 2.4

VCC= 3.3V
VCC= 5.0V

2.0
V

2.4

Input Logic Threshold High
(Note 3)

No load, VCC= 3.3V or 5.0V,
TA= +25°C

mA

0.3 1.0

MAX3222/MAX3232/
MAX3241

MAX3237

SHDN = GND, TA= +25°C µA1.0 10Shutdown Supply Current

VCC= 3.3V
VCC= 5.0V
VCC= 3.3V
VCC= 5.0V

DC CHARACTERISTICS

LOGIC INPUTS AND RECEIVER OUTPUTS

RECEIVER INPUTS

MAX3222/MAX3232/MAX3237/MAX3241

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

_______________________________________________________________________________________ 3

TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

T1IN = T2IN = GND, T3IN = VCC,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with 2.5mA each

CONDITIONS

V±5.0Transmitter Output Voltage

V0.3Input Hysteresis

UNITS

MIN TYP MAX

PARAMETER

All transmitter outputs loaded with 3kΩ to ground V±5.0 ±5.4Output Voltage Swing

mA±35 ±60Output Short-Circuit Current

VCC= V+ = V- = 0V, T

OUT

= ±2V Ω300 10MOutput Resistance

V

OUT

= ±12V, VCC= 0V or 3V to 5.5V, transmitters

disabled

µA±25Output Leakage Current

t

PHL

RL= 3kΩ, CL= 1000pF, one transmitter switching

t

PLH

| t

PHL

- t

PLH

|

| t

PHL

- t

PLH

|

Normal operation

Normal operation

CONDITIONS

0.3
µs

0.3

Receiver Propagation Delay

kbps120 235Maximum Data Rate

ns300Receiver Skew

ns300Transmitter Skew

ns200Receiver Output Disable Time

ns200Receiver Output Enable Time

UNITS

MIN TYP MAX

PARAMETER

630

VCC= 3.3V, RL= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
TA= +25°C

V/µs

430

Transition-Region Slew Rate

R_IN to R_OUT, CL= 150pF

CL= 150pF to
1000pF

CL= 150pF to
2500pF

TA= +25°C kΩ357Input Resistance

MOUSE DRIVEABILITY (MAX3241)

TRANSMITTER OUTPUTS

MAX3222/MAX3232/MAX3237/MAX3241

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(VCC= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

0

MAX3222/MAX3232

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3222-01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

2000 30001000 4000 5000

V

OUT

+

V

OUT

-

0

2

4

6

8

10

12

14

16

18

20

22

150

MAX3222/MAX3232

SLEW RATE

vs. LOAD CAPACITANCE

MAX3222-02

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

2000 30001000 4000 5000

FOR DATA RATES UP TO 235kbps

+SLEW

-SLEW

0

5

10

15

20

25

30

35

40

0

MAX3222/MAX3232

SUPPLY CURRENT vs. LOAD CAPACITANCE

WHEN TRANSMITTING DATA

MAX3222-03

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

2000 30001000 4000 5000

235kbps

120kbps

20kbps

RL= 3kΩ, CL= 1000pF, one transmitter switching,
MBAUD = GND

Normal operation

CONDITIONS

Normal operation ns200Receiver Output Disable Time

| t

PHL

- t

PLH

|, MBAUD = GND

ns100

0.15

250

µs

0.15

Receiver Propagation Delay

ns200Receiver Output Enable Time

UNITS

MIN TYP MAX

PARAMETER

TIMING CHARACTERISTICS—MAX3237

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

VCC= 3.0V to 4.5V, RL= 3kΩ, CL= 250pF,
one transmitter switching, MBAUD = V

CC

1000

VCC= 4.5V to 5.5V, RL= 3kΩ, CL= 1000pF,
one transmitter switching, MBAUD = V

CC

kbps

1000

Maximum Data Rate

R_IN to R_OUT, CL= 150pF

| t

PHL

- t

PLH

|, MBAUD = V

CC

ns25

Transmitter Skew

| t

PHL

- t

PLH

|

ns50Receiver Skew

630

V/µs

430

t

PHL

t

PLH

CL= 150pF to 2500pF,
MBAUD = GND

CL= 150pF
to 1000pF

MBAUD =

GND
VCC= 3.3V, RL= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
TA= +25°C

Transition-Region Slew Rate

MBAUD =

V

CC

24 150

Note 2: MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.

MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested
at 5.0V ±10%.

Note 3: Transmitter input hysteresis is typically 250mV.

MAX3222/MAX3232/MAX3237/MAX3241

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

_______________________________________________________________________________________

5

-7.5

-5.0

-2.5

0

2.5

5.0

7.5

0

MAX3241

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3222-04

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

2000 30001000 4000 5000

V

OUT

+

1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps

V

OUT

-

ALL OUTPUTS LOADED WITH 3kΩ +CL

0.1µF CHARGE-PUMP CAPACITORS
FOR ALL DATA RATES UP TO 235kbps

4

6

8

10

12

14

16

18

20

22

24

0

MAX3241

SLEW RATE

vs. LOAD CAPACITANCE

MAX3222-05

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

2000 30001000 4000 5000

+SLEW

-SLEW

0

5

10

15

20

25

30

35

45
40

0

MAX3241

SUPPLY CURRENT vs. LOAD

CAPACITANCE WHEN TRANSMITTING DATA

MAX3222-06

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

2000 30001000 4000 5000

235kbps

120kbps

20kbps

-7.5

-5.0

-2.5

0

2.5

5.0

7.5

0

MAX3237

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE (MBAUD = GND)

MAX3222-07

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

2000 30001000 4000 5000

1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C

L

LOADS

V

CC

= 3.3V

0

10

20

30

50

40

60

70

0

MAX3237

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = V

CC

)

MAX3222-10

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

500 1000 1500 2000

-SLEW, 1Mbps
+SLEW, 1Mbps

1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C

L

LOAD EACH OUTPUT

V

CC

= 3.3V

-SLEW, 2Mbps
+SLEW, 2Mbps

-7.5

-5.0

-2.5

0

2.5

5.0

7.5

0

MAX3237

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE (MBAUD = V

CC

)

MAX3222-08

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

500 1000 1500 2000

1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C

L

LOAD, EACH OUTPUT

V

CC

= 3.3V

2Mbps

1.5Mbps

1Mbps

2Mbps

1Mbps

1.5Mbps

0

10

20

30

40

50

60

0

MAX3237

SUPPLY CURRENT vs.

LOAD CAPACITANCE (MBAUD = GND)

MAX3222-11

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

2000 30001000 4000 5000

240kbps

120kbps

20kbps

1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C

L

LOADS

V

CC

= 3.3V

0

2

4

6

8

10

12

0

MAX3237

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = GND)

MAX3222-09

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

2000 30001000 4000 5000

+SLEW

-SLEW

1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C

L

LOADS

V

CC

= 3.3V

0

10

30

20

40

50

60

70

0

MAX3237

SKEW vs. LOAD CAPACITANCE

(t

PLH

- t

PHL

)

MAX3222-12

LOAD CAPACITANCE (pF)

1000 1500500 2000 2500

MAX

MIN

AVERAGE; 10 PARTS

SKEW (ns)

1 TRANSMITTER AT 512kbps
4 TRANSMITTERS AT 32kbps
3kΩ + C

L

LOADS

V

CC

= 3.3V

MBAUD = V

CC

_____________________________Typical Operating Characteristics (continued)

(VCC= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)