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AVAILABLE

EVALUATION KIT AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

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 ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact Discharge

(±9kV for MAX3246E), and ±15kV using the Human Body

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 ±15kV using the Human

Body Model.

A proprietary low-dropout transmitter output stage delivers

true RS-232 performance from a +3.0V to +5.5V power

supply, using an internal dual charge pump. The charge

pump requires only four small 0.1µF capacitors for opera-

tion from a +3.3V supply. Each device guarantees opera-

tion at data rates of 250kbps while maintaining RS-232

output levels. The MAX3237E guarantees operation at

250kbps in the normal operating mode and 1Mbps in the

MegaBaud™ 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 battery-pow-

ered portable systems. The MAX3222E receivers remain

active in shutdown mode, allowing monitoring of external

devices while consuming only 1µA of supply current. The

MAX3222E and MAX3232E are pin, package, and func-

tionally compatible with the industry-standard MAX242

and MAX232, respectively.

The MAX3241E/MAX3246E are complete serial ports

(three drivers/five receivers) designed for notebook and

subnotebook 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 only 1µA (MAX3241E/MAX3246E) or 10nA

(MAX3237E).

The MAX3222E, MAX3232E, and MAX3241E are avail-

able in space-saving SO, SSOP, TQFN and TSSOP pack-

ages. The MAX3237E is offered in an SSOP package.

The MAX3246E is offered in the ultra-small 6 x 6 UCSP™

package.

Next-Generation Device Features

♦♦

For Space-Constrained Applications

MAX3228E/MAX3229E: ±15kV ESD-Protected,

+2.5V to +5.5V, RS-232 Transceivers in UCSP

♦♦

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

Applications

Battery-Powered Equipment

Cell Phones Smart Phones

Cell-Phone Data Cables

Notebook, Subnotebook, and Palmtop Computers

Printers

xDSL Modems

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

19-1298; Rev 12; 12/10

Ordering Information

Ordering Information continued at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

Dice are tested at T

= +25°C, DC parameters only.

EP = Exposed pad.

/V denotes an automotive qualified part.

Pin Configurations, Selector Guide, and Typical Operating

Circuits appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX3222ECTP+ 0°C to +70°C

20 TQFN-EP**

(5mm x 5mm)

MAX3222ECUP+ 0°C to +70°C 20 TSSOP

MAX3222ECAP+ 0°C to +70°C 20 SSOP

MAX3222ECWN+ 0°C to +70°C 18 Wide SO

MAX3222ECPN+ 0°C to +70°C 18 Plastic DIP

MAX3222EC/D+ 0°C to +70°C Dice*

MAX3222EETP+ -40°C to +85°C

20 TQFN-EP**

(5mm x 5mm)

MAX3222EEUP/V+ -40°C to +85°C 20 TSSOP

MAX3222EEUP+ -40°C to +85°C 20 TSSOP

MAX3222EEAP+ -40°C to +85°C 20 SSOP

MAX3222EEWN+ -40°C to +85°C 18 Wide SO

MAX3222EEPN+ -40°C to +85°C 18 Plastic DIP

MAX3232ECAE+ 0°C to +70°C 16 SSOP

MAX3232ECWE+ 0°C to +70°C 16 Wide SO

MAX3232ECPE+ 0°C to +70°C 16 Plastic DIP

MegaBaud and UCSP are trademarks of Maxim Integrated

Products, Inc.

MAX3222E/MAX3232E/MAX3237E/

MAX3241E/MAX3246E

Summary of content (22 pages)

PAGE 1
EVALUATION KIT AVAILABLE LE AVAILAB MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers General Description The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface devices feature low power consumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection.
PAGE 2
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V V+ to GND (Note 1) ..................................................-0.3V to +7V V- to GND (Note 1) ...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................
PAGE 3
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers ELECTRICAL CHARACTERISTICS (continued) (VCC = +3V to +5.5V, C1–C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 3, 4) PARAMETER CONDITIONS MIN TYP MAX UNITS ±0.05 ±10 μA 0.
PAGE 4
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E (VCC = +3V to +5.5V, C1–C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers __________________________________________Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.
PAGE 6
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) 60 8 SR+ 6 4 40 30 20 1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.
PAGE 7
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Pin Description PIN MAX3222E MAX3232E TSSOP/ TQFN SSOP MAX3241E SO/DIP/ NAME MAX3237E SSOP/ MAX3246E SSOP/ 20-PIN SO/ TQFN 16-PIN TSSOP TSSOP TSSOP FUNCTION TQFN SO/ DIP 19 1 1 — — — 13* 23 22 B3 EN Receiver Enable. Active low.
PAGE 8
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Pin Description (continued) PIN MAX3222E TQFN SO/ DIP 16 16 TSSOP/ TQFN SSOP 18 13 MAX3241E SO/DIP/ NAME MAX3237E SSOP/ MAX3246E SSOP/ 20-PIN SO/ TQFN 16-PIN TSSOP TSSOP TSSOP 15 18 2 25 24 F5 Ground +3.0V to +5.
PAGE 9
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers VCC VCC 0.1µF C1+ 0.
PAGE 10
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers VCC 5V/div 0 VCC PREVIOUS RS-232 PROTECTION DIODE Rx SHDN T2OUT 2V/div 0 5kΩ UART GND T1OUT VCC = 3.3V C1–C4 = 0.1µF Tx 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.
PAGE 11
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Table 1.
PAGE 12
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E Table 2. Required Minimum Capacitor Values C2, C3, C4 (µF) MAX3222E/MAX3232E/MAX3241E 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 MAX3237E/MAX3246E 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1.0 Table 3. Logic-Family Compatibility with Various Supply Voltages VCC SUPPLY VOLTAGE (V) 3.3 3.3 Compatible with all CMOS families 5 5 Compatible with all TTL and CMOS families 3.
PAGE 13
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers VCC = +3.0V TO +5.
PAGE 14
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Transmitter Outputs Recovering from Shutdown Figure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3kΩ in parallel with 2500pF.
PAGE 15
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 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. High Data Rates The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E maintain the RS-232 ±5V minimum transmitter output voltage even at high data rates. Figure 7 shows a transmitter loopback test circuit.
PAGE 16
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers __________________________________________________________Pin Configurations TOP VIEW EN 1 + 18 SHDN + + EN 1 N.C. 1 20 N.C.
PAGE 17
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers 12 11 GND 16 10 T2IN VCC 17 9 N.C. SHDN 18 8 R2OUT 7 R2IN 6 T2OUT MAX3222E *EP 10 9 GND 13 8 T2IN VCC 14 7 R2OUT 6 R2IN 5 T2OUT MAX3232E *EP 3 4 5 1 2 3 4 C1- C2+ C2- V- + V- C1+ 16 C2- C1- 11 C2+ 2 C1+ + 1 12 V+ 15 EN 19 V+ 20 T1IN T1IN 13 R1OUT N.C.
PAGE 18
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers __________________________________________________Typical Operating Circuits +3.3V +3.3V 17 CBYPASS C1 0.1µF 2 C1+ 4 5 C2 0.1µF 6 C1- V+ MAX3222E C2+ V- 3 C3* 0.1µF C1 0.1µF C4 0.1µF C2 0.1µF 7 C2- 12 T1IN 10 R2OUT 1 V- R2IN 9 GND 16 SHDN 6 C4 0.
PAGE 19
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers _____________________________________Typical Operating Circuits (continued) +3.3V +3.3V CBYPASS 28 C1+ CBYPASS 26 VCC 27 V+ 0.1µF 25 C11 0.1µF 3 V- 4 23 T2IN 22 T3IN 19 T4IN T1 T2 T3 0.1µF T4 C2 0.1µF T1OUT 5 T2OUT 6 T3OUT 7 28 C1+ 24 1 C2- 24 T1IN LOGIC INPUTS MAX3237E C2+ C3* 0.1µF C1 0.
PAGE 20
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers _____________________________________Typical Operating Circuits (continued) +3.3V CBYPASS C1 0.1µF F3 C1+ F4 E1 C2 0.1µF TTL/CMOS INPUTS D1 C1- F2 VCC F1 V+ MAX3246E C2+ V- C3* 0.1µF C1 C4 0.
PAGE 21
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers Ordering Information (continued) PART TEMP RANGE Selector Guide PIN-PACKAGE PART NO.
PAGE 22
MAX3222E/MAX3232E/MAX3237E/ MAX3241E/MAX3246E ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.