MAX232EC/D Maxim Integrated, MAX232EC/D Datasheet - Page 9

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MAX232EC/D

Manufacturer Part Number
MAX232EC/D
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX220, MAX222, MAX223, MAX225, MAX230, MAX231, MAX232, MAX232A, MAX233, MAX233A, MAX234, MAX235, MAX236, MAX237, MAX238, MAX239, MAX240, MAX241, MAX242, MAX243, MAX244, MAX245, MAX246, MAX247, MAX248, MAX249r
Datasheet

Specifications of MAX232EC/D

Data Rate
200 Kbps
Operating Supply Voltage
5 V
Supply Current
10 mA
Operating Temperature Range
0 C to + 70 C
Function
Transmitter
Number Of Drivers
2
Number Of I/os
8
Number Of Receivers
2
Propagation Delay Time Ns
3.5 us, 1 us
Shutdown
No
Maxim Integrated
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.
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
Figure 3. Transition Slew-Rate Circuit
_______________Detailed Description
±15kV ESD-Protected, +5V RS-232 Transceivers
+5V
0.1μF
0.1μF
0.1μF
0V (+5V)
0V (+5V)
*
*
*
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.
+5V to ±10V Dual Charge-Pump
MINIMUM SLEW-RATE TEST CIRCUIT
C1+
C1-
C2+
C2-
T_IN
R_OUT
EN (EN)
SHDN (SHDN)
MAX202E–MAX213E, MAX232E/MAX241E
V
CC
400kΩ
MAX2_ _E
R_
V
T_
CC
Voltage Converter
T_OUT
R_IN
5kΩ
V+
V-
0.1μF
0.1μF
*
*
3kΩ
* 1μF FOR MAX232E/MAX241E
( ) ARE FOR MAX213E
2500pF
into -10V, storing the -10V on the V- output filter
capacitor, C4.
In shutdown mode, V+ is internally connected to V
a 1kΩ pull-down resistor, and V- is internally connected
to ground by a 1kΩ pull up resistor.
With V
is ±8V when loaded with a nominal 5kΩ 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 3kΩ load, minimum V
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 400kΩ pull up resistors to V
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.
+5V
0.1μF
0.1μF
0.1μF
0V (+5V)
0V (+5V)
*
*
*
CC
= 5V, the typical driver output voltage swing
MAXIMUM SLEW-RATE TEST CIRCUIT
C1+
C1-
C2+
C2-
T_IN
R_OUT
EN (EN)
SHDN (SHDN)
V
CC
400kΩ
MAX2_ _E
V
T_
CC
R_
T_OUT
R_IN
5kΩ
V+
V-
0.1μF
0.1μF
*
*
RS-232 Drivers
7kΩ
50pF
CC
, and
CC
CC
by
9

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