MAX202ECSE+T

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MAX202E–MAX213E,
MAX232E/MAX241E

±15kV ESD-Protected, 

5V RS-232 Transceivers 

 V+

MAX2_ _E

0.1

μF

*

 V

CC

0.1

μF

*

T_

R_

0.1

μF

*

C1+

C1-

C2+

C2-

 V

CC

T_OUT

R_OUT

EN (EN)

SHDN (SHDN)

400k

Ω

5k

Ω

0.1

μF

*

0.1

μF

*

3k

Ω

 +5V

R_IN

T_IN

MINIMUM SLEW-RATE TEST CIRCUIT

0V (+5V)

0V (+5V)

2500pF

 V-

 V+

0.1

μF

*

 V

CC

0.1

μF

*

 R_

T_

0.1

μF

*

C1+

C1-

C2+

C2-

 V

CC

T_OUT

R_OUT

EN (EN)

SHDN (SHDN)

400k

Ω

5k

Ω

0.1

μF

*

0.1

μF

*

7k

Ω

 +5V

R_IN

T_IN

MAXIMUM SLEW-RATE TEST CIRCUIT

0V (+5V)

0V (+5V)

50pF

 V-

 (  ) ARE FOR MAX213E

              * 1

μF FOR MAX232E/MAX241E

MAX2_ _E

TRANSMITTER INPUT PULL-UP RESISTORS, ENABLE,  AND SHUTDOWN ARE NOT PROVIDED ON THE MAX202E, MAX203E, AND MAX232E.
ENABLE AND SHUTDOWN ARE NOT PROVIDED ON THE MAX207E AND MAX208E.

Figure 3.  Transition Slew-Rate Circuit

Detailed Description

The MAX202E–MAX213E, MAX232E/MAX241E consist of
three sections:  charge-pump voltage converters, dri-
vers (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 fre-
quently 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 capaci-
tor, C4.

In shutdown mode, V+ is internally connected to V

CC

by

a 1kΩ pull-down resistor, and V- is internally connected
to ground by a 1kΩ pull up resistor.

RS-232 Drivers

With V

CC

= 5V, the typical driver output voltage swing

is ±8V when loaded with a nominal 5kΩ RS-232 receiv-
er. 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 3kΩ load, minimum V

CC

, and maximum oper-

ating 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 uncon-
nected because 400kΩ 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.

MAX202ECSE+T Information:
Part No.
MAX202ECSE+T

RFQ

Description
IC TXRX RS-232 W/CAP 16-SOIC
File Size
399670 bytes
Page Size
612 x 792 pts (letter)
All Pages
25
Manufacturer
Maxim Integrated
Homepage
http://www.maximintegrated.com/en.html
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