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________________________________________________________________Maxim Integrated Products 1

General Description

The MAX202E–MAX213E, MAX232E/MAX241E line drivers/receivers are designed for RS-232 and V.28communications in harsh environments. Each transmitter output and receiver input is protected against ±15kV electrostatic discharge (ESD) shocks, without latchup.The various combinations of features are outlined in the Selector Guide.The drivers and receivers for all ten devices meet all EIA/TIA-232E and CCITT V.28specifications at data rates up to 120kbps, when loaded in accordance with the EIA/TIA-232E specification.

The MAX211E/MAX213E/MAX241E are available in 28-pin SO packages, as well as a 28-pin SSOP that uses 60% less board space. The MAX202E/MAX232E come in 16-pin TSSOP, narrow SO, wide SO, and DIP packages. The MAX203E comes in a 20-pin DIP/SO package, and needs no external charge-pump capacitors. The MAX205E comes in a 24-pin wide DIP package, and also eliminates external charge-pump capacitors. The MAX206E/MAX207E/MAX208E come in 24-pin SO, SSOP, and narrow DIP packages. The MAX232E/MAX241E operate with four 1μF capacitors,while the MAX202E/MAX206E/MAX207E/MAX208E/MAX211E/MAX213E operate with four 0.1μF capacitors,further reducing cost and board space.

________________________Applications

Notebook, Subnotebook, and Palmtop Computers Battery-Powered Equipment Hand-Held Equipment

Next-Generation Device Features

o For Low-Voltage Applications

MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E: ±15kV ESD-Protected Down to

10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232Transceivers (MAX3246E Available in a UCSP?Package)

o For Low-Power Applications

MAX3221/MAX3223/MAX3243: 1μA Supply

Current, True +3V to +5.5V RS-232 Transceivers with Auto-Shutdown?

o For Space-Constrained Applications

MAX3233E/MAX3235E: ±15kV ESD-Protected,1μA, 250kbps, +3.0V/+5.5V, Dual RS-232Transceivers with Internal Capacitors

o 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

MAX202E–MAX213E, MAX232E/MAX241E

±15kV ESD-Protected, +5V RS-232 Transceivers

Selector Guide

19-0175; Rev 6; 3/05

Pin Configurations and Typical Operating Circuits appear at end of data sheet.

Yes

PART

NO. OF RS-232DRIVERS

NO. OF RS-232RECEIVERS

RECEIVERS ACTIVE IN SHUTDOWN

NO. OF EXTERNAL CAPACITORS

(μF)

LOW-POWER SHUTDOWN

TTL TRI-STATE MAX202E 220 4 (0.1)No No MAX203E 220None No No MAX205E 550None Yes Yes MAX206E 430 4 (0.1)Yes Yes MAX207E 530 4 (0.1)No No MAX208E 440 4 (0.1)No No MAX211E 450 4 (0.1)Yes Yes MAX213E 452 4 (0.1)Yes Yes MAX232E 220 4 (1)No No MAX241E

4 (1)

Yes

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at https://www.wendangku.net/doc/6113688576.html,.

AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.

Ordering Information

Ordering Information continued at end of data sheet.

2_______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

ABSOLUTE MAXIMUM RATINGS

V CC ..........................................................................-0.3V to +6V V+................................................................(V CC - 0.3V) to +14V V-............................................................................-14V to +0.3V Input Voltages

T_IN............................................................-0.3V to (V+ + 0.3V)R_IN...................................................................................±30V Output Voltages

T_OUT.................................................(V- - 0.3V) to (V+ + 0.3V)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 9.4mW/°C above +70°C)...........755mW

20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...889mW 20-Pin SO (derate 10.00mW/°C above +70°C).............800mW 24-Pin Narrow Plastic DIP

(derate 13.33mW/°C above +70°C) ...............................1.07W 24-Pin Wide Plastic DIP

(derate 14.29mW/°C above +70°C)................................1.14W 24-Pin SO (derate 11.76mW/°C above +70°C).............941mW 24-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SO (derate 12.50mW/°C above +70°C)....................1W 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW Operating Temperature Ranges

MAX2_ _EC_ _.....................................................0°C to +70°C MAX2_ _EE_ _...................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +165°C Lead Temperature (soldering, 10s).................................+300°C

ELECTRICAL CHARACTERISTICS

(V CC = +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; V CC = +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1μF for MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1μF for MAX232E/241E; T A = T MIN to T MAX ; unless otherwise noted. Typical values are at T A = +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.

ELECTRICAL CHARACTERISTICS (continued)

MAX202E–MAX213E, MAX232E/MAX241E (V CC= +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; V CC= +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1μF for

MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1μF for MAX232E/241E; T A= T MIN to T MAX; unless otherwise noted. Typical values

are at T A= +25°C.)

Note 1:MAX211EE_ _ tested with V CC= +5V ±5%.

_______________________________________________________________________________________3

4______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

__________________________________________Typical Operating Characteristics

(Typical Operating Circuits, V CC = +5V, T A = +25°C, unless otherwise noted.)

5.0

0MAX211E/MAX213E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

LOAD CAPACITANCE (pF)V O H , -V O L (V )

5.5

6.06.5

7.07.5

8.0

1000

2000

3000

4000

5000

0MAX211E/MAX213E/MAX241E TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE

LOAD CAPACITANCE (pF)

S L E W R A T E ( V /μs )

15202530

10002000300040005000

_______________________________________________________________________________________5

MAX202E–MAX213E, MAX232E/MAX241E

____________________________Typical Operating Characteristics (continued)

(Typical Operating Circuits, V CC = +5V, T A = +25°C, unless otherwise noted.)

MAX202E/MAX203E/MAX232E TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE

LOAD CAPACITANCE (pF)

S L E W R A T E ( V /μs )

468

101214

1000

2000

3000

4000

5000

5.07.5

-7.5

3000

MAX205E–MAX208E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

-5.02.5

LOAD CAPACITANCE (pF)O U T P U T V O L T A G E (V )

1000

2000

4000

5000

0-2.5

4550

3000

MAX205E

–MAX208E SUPPLY CURRENT vs. LOAD CAPACITANCE

2540LOAD CAPACITANCE (pF)

S U P P L Y C U R R E N T (m A )

1000

2000

40005000

3530

2.55.0-10.0

180MAX205E –MAX208E

OUTPUT VOLTAGE vs. DATA RATE

-7.50DATA RATE (kbps)O U T P U T V O L T A G E (V )

12024015030

90210-2.5-5.010.0

7.5

6_______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

MAX203E

MAX205E

_____________________________________________________________Pin Descriptions

MAX202E/MAX232E

_______________________________________________________________________________________7

MAX202E–MAX213E, MAX232E/MAX241E

MAX208E

________________________________________________Pin Descriptions (continued)

MAX206E

MAX207E

_______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

MAX211E/MAX213E/MAX241E)

(MAX205E/MAX206E/MAX211E/MAX213E/MAX241E)

________________________________________________Pin Descriptions (continued)

MAX211E/MAX213E/MAX241E

Figure 3. Transition Slew-Rate Circuit

_______________Detailed Description The MAX202E–MAX213E, MAX232E/MAX241E consist of three sections: charge-pump voltage converters, drivers (transmitters), and receivers. These E versions provide extra protection against ESD. They survive ±15kV discharges to the RS-232 inputs and outputs, tested using the Human Body Model. When tested according to IEC1000-4-2, they survive ±8kV contact-discharges and ±15kV air-gap discharges. The rugged E versions are intended for use in harsh environments or applications where the RS-232 connection is frequently changed (such as notebook computers). The standard (non-“E”) MAX202, MAX203, MAX205–MAX208, MAX211, MAX213, MAX232, and MAX241 are recommended for applications where cost is critical.

+5V to ±10V Dual Charge-Pump

Voltage Converter The +5V to ±10V conversion is performed by dual charge-pump voltage converters (Figure 4). The first charge-pump converter uses capacitor C1 to double the +5V into +10V, storing the +10V on the output filter capacitor, C3. The second uses C2 to invert the +10V into -10V, storing the -10V on the V- output filter capacitor, C4.

In shutdown mode, V+ is internally connected to V CC by a 1k?pull-down resistor, and V- is internally connected to ground by a 1k?pull up resistor.

RS-232 Drivers With V CC= 5V, the typical driver output voltage swing is ±8V when loaded with a nominal 5k?RS-232 receiver. The output swing is guaranteed to meet EIA/TIA-232E and V.28 specifications that call for ±5V minimum output levels under worst-case conditions. These include a 3k?load, minimum V CC, and maximum operating temperature. The open-circuit output voltage swings from (V+ - 0.6V) to V-.

Input thresholds are CMOS/TTL compatible. The unused drivers’ inputs on the MAX205E–MAX208E, MAX211E, MAX213E, and MAX241E can be left unconnected because 400k?pull up resistors to V CC are included on-chip. Since all drivers invert, the pull up resistors force the unused drivers’ outputs low. The MAX202E, MAX203E, and MAX232E do not have pull up resistors on the transmitter inputs.

_______________________________________________________________________________________9

MAX202E–MAX213E, MAX232E/MAX241E

10______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

±15kV ESD-Protected, +5V RS-232 Transceivers When in low-power shutdown mode, the MAX205E/MAX206E/MAX211E/MAX213E/MAX241E driver outputs are turned off and draw only leakage currents—even if they are back-driven with voltages between 0V and 12V. Below -0.5V in shutdown, the transmitter output is diode-clamped to ground with a 1k ?series impedance.

RS-232 Receivers

The receivers convert the RS-232 signals to CMOS-logic output levels. The guaranteed 0.8V and 2.4V receiver input thresholds are significantly tighter than the ±3V thresholds required by the EIA/TIA-232E specification.This allows the receiver inputs to respond to TTL/CMOS-logic levels, as well as RS-232 levels.

The guaranteed 0.8V input low threshold ensures that receivers shorted to ground have a logic 1 output. The 5k ?input resistance to ground ensures that a receiver with its input left open will also have a logic 1 output. Receiver inputs have approximately 0.5V hysteresis.This provides clean output transitions, even with slow rise/fall-time signals with moderate amounts of noise and ringing.

In shutdown, the MAX213E’s R4 and R5 receivers have no hysteresis.

Shutdown and Enable Control (MAX205E/MAX206E/MAX211E/

MAX213E/MAX241E)

In shutdown mode, the charge pumps are turned off,V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are disabled. This reduces supply current typically to 1μA (15μA for the MAX213E).The time required to exit shutdown is under 1ms, as shown in Figure 5.

Receivers

All MAX213E receivers, except R4 and R5, are put into a high-impedance state in shutdown mode (see Tables 1a and 1b). The MAX213E’s R4 and R5 receivers still function in shutdown mode. These two awake-in-shutdown receivers can monitor external activity while maintaining minimal power consumption.

The enable control is used to put the receiver outputs into a high-impedance state, to allow wire-OR connection of two EIA/TIA-232E ports (or ports of different types) at the UART. It has no effect on the RS-232 drivers or the charge pumps.

N ote: The enabl e control pin is active l ow for the MAX211E/MAX241E (EN ), but is active high for the MAX213E (EN). The shutdown control pin is active high for the MAX205E/MAX206E/MAX211E/MAX241E (SHDN), but is active low for the MAX213E (SHDN ).

Figure 4. Charge-Pump Diagram

______________________________________________________________________________________11

MAX202E–MAX213E, MAX232E/MAX241E

V+V-200μs/div

3V 0V 10V 5V 0V -5V -10V

SHDN

MAX211E

Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1μF capacitors)

X = Don't care.

*Active = active with reduced performance

SHDN E N OPERATION STATUS Tx Rx 00Normal Operation All Active All Active 01Normal Operation All Active All High-Z 1

Shutdown

All High-Z

Table 1a. MAX205E/MAX206E/MAX211E/MAX241E Control Pin Configurations

Table 1b. MAX213E Control Pin Configurations

The MAX213E’s receiver propagation delay is typically 0.5μs in normal operation. In shutdown mode,propagation delay increases to 4μs for both rising and falling transitions. The MAX213E’s receiver inputs have approximately 0.5V hysteresis, except in shutdown,when receivers R4 and R5 have no hysteresis.

When entering shutdown with receivers active, R4 and R5 are not valid until 80μs after SHDN is driven low.When coming out of shutdown, all receiver outputs are invalid until the charge pumps reach nominal voltage levels (less than 2ms when using 0.1μF capacitors).

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. Maxim’s engineers 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-232products can latch and must be powered down to remove latchup.

ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits:

1)±15kV using the Human Body Model

2)±8kV using the contact-discharge method specified

in IEC1000-4-2

3)±15kV using IEC1000-4-2’s air-gap method.ESD Test Conditions

ESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test set-up, test methodology, and test results.

Human Body Model

Figure 6a shows the Human Body Model, and Figure 6b shows the current waveform it generates when discharged 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.

S H D N EN

OPERATION STATUS Tx 1–400Shutdown All High-Z 01Shutdown All High-Z 10Normal Operation 1

Normal Operation

All Active

All Active Active

1–34, 5High-Z Active

High-Z High-Z High-Z Active*High-Z Rx

______________________________________________________________________________________

M A X 202E –M A X 213E , M A X 232E /M A X 241E

IEC1000-4-2

The IEC1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX202E/MAX203E–MAX213E, MAX232E/MAX241E help you design equipment that meets level 4 (the highest level) of IEC1000-4-2, without the need for additional ESD-protection components.

The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2, because series resistance is lower in the IEC1000-4-2 model. Hence, the ESD withstand voltage measured to IEC1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7b shows the current waveform for the 8kV IEC1000-4-2 level-four ESD contact-discharge test.

The air-gap test involves approaching the device with a charged probe. The contact-discharge method connects the probe to the device before the probe is energized.

Machine Model

The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, 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.

Figure 7a. IEC1000-4-2 ESD Test Model

Figure 7b. IEC1000-4-2 ESD Generator Current Waveform

Figure 6a. Human Body ESD Test Model

Figure 6b. Human Body Model Current Waveform

__________Applications Information

Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation. The MAX202E, MAX206–MAX208E, MAX211E, and MAX213E require 0.1μF capacitors, and the MAX232E and MAX241E require 1μF capacitors, although in all cases capacitors up to 10μF can be used without harm. Ceramic, aluminum-electrolytic, or tantalum capacitors are suggested for the 1μF capacitors, and ceramic dielectrics are suggested for the 0.1μF capacitors. When using the minimum recommended capacitor values, make sure the capacitance value does not degrade excessively as the operating temperature varies. If in doubt, use capacitors with a larger (e.g., 2x) nominal value. The capacitors’ effective series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-.

Use larger capacitors (up to 10μF) to reduce the output impedance at V+ and V-. This can be useful when “stealing” power from V+ or from V-. The MAX203E and MAX205E have internal charge-pump capacitors. Bypass V CC to ground with at least 0.1μF. In applications sensitive to power-supply noise generated by the charge pumps, decouple V CC to ground with a capacitor the same size as (or larger than) the charge-pump capacitors (C1–C4).

V+ and V- as Power Supplies A small amount of power can be drawn from V+ and V-, although this will reduce both driver output swing and noise margins. Increasing the value of the charge-pump capacitors (up to 10μF) helps maintain performance when power is drawn from V+ or V-.

Driving Multiple Receivers Each transmitter is designed to drive a single receiver. Transmitters can be paralleled to drive multiple receivers.

Driver Outputs when Exiting Shutdown The driver outputs display no ringing or undesirable transients as they come out of shutdown.

High Data Rates These transceivers maintain the RS-232 ±5.0V minimum driver output voltages at data rates of over 120kbps. For data rates above 120kbps, refer to the Transmitter Output Voltage vs. Load Capacitance graphs in the Typical Operating Characteristics. Communication at these high rates is easier if the capacitive loads on the transmitters are small; i.e., short cables are best.

Table 2. Summary of EIA/TIA-232E, V.28 Specifications

MAX202E–MAX213E, MAX232E/MAX241E

M A X 202E –M A X 213E , M A X 232E /M A X 241E

____________Pin Configurations and Typical Operating Circuits (continued)

Table 3. DB9 Cable Connections

Commonly Used for EIA/TIAE-232E and V.24 Asynchronous Interfaces

____________Pin Configurations and Typical Operating Circuits (continued)

MAX202E–MAX213E, MAX232E/MAX241E

M A X 202E –M A X 213E , M A X 232E /M A X 241E

____________Pin Configurations and Typical Operating Circuits (continued)

MAX202E–MAX213E, MAX232E/MAX241E

____________Pin Configurations and Typical Operating Circuits (continued)

M A X 202E –M A X 213E , M A X 232E /M A X 241E

____________Pin Configurations and Typical Operating Circuits (continued)

MAX202E–MAX213E, MAX232E/MAX241E

____________Pin Configurations and Typical Operating Circuits (continued)

M A X 202E –M A X 213E , M A X 232E /M A X 241E

____________Pin Configurations and Typical Operating Circuits (continued)