MAX3232CAE+ Maxim Integrated Products, MAX3232CAE+ Datasheet - Page 7

IC TXRX RS232 250KBPS LP 16-SSOP

MAX3232CAE+

Manufacturer Part Number
MAX3232CAE+
Description
IC TXRX RS232 250KBPS LP 16-SSOP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX3232CAE+

Number Of Drivers/receivers
2/2
Protocol
RS232
Voltage - Supply
3 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
16-SSOP
Propagation Delay Time Ns
0.3 us
Operating Supply Voltage
3 V to 5 V
Supply Current
0.3 mA
Operating Temperature Range
0 C to + 70 C
Data Rate
120 Kbps
Mounting Style
SMD/SMT
Number Of I/os
2 / 2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX3222/MAX3232/MAX3237/MAX3241’s internal
power supply consists of a regulated dual charge pump
that provides output voltages of +5.5V (doubling charge
pump) and -5.5V (inverting charge pump), regardless of
the input voltage (V
charge pumps operate in a discontinuous mode; if the
output voltages are less than 5.5V, the charge pumps
are enabled, and if the output voltages exceed 5.5V, the
charge pumps are disabled. Each charge pump
requires a flying capacitor (C1, C2) and a reservoir
capacitor (C3, C4) to generate the V+ and V- supplies.
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3222/MAX3232/MAX3241 transmitters guaran-
tee a 120kbps data rate with worst-case loads of 3kΩ in
parallel with 1000pF, providing compatibility with PC-to-
PC communication software (such as LapLink™).
Typically, these three devices can operate at data rates
of 235kbps. Transmitters can be paralleled to drive multi-
ple receivers or mice.
LapLink is a trademark of Traveling Software, Inc.
Figure 1. Slew-Rate Test Circuits
_______________Detailed Description
C1
C2
Transceivers Using Four 0.1µF External Capacitors
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
V
*
0V
CC
V
MAX3222/MAX3241 ONLY
CC
MINIMUM SLEW-RATE TEST CIRCUIT
Dual Charge-Pump Voltage Converter
0.1µF
SHDN
C1+
C1-
C2+
C2-
T_ IN
R_ OUT
EN
*
*
_______________________________________________________________________________________
CC
MAX3222
MAX3232
MAX3237
MAX3241
) over the 3.0V to 5.5V range. The
GND
V
CC
5kΩ
RS-232 Transmitters
T_ OUT
R_ IN
V+
V-
3kΩ
C3
C4
2500pF
The MAX3222/MAX3237/MAX3241’s output stage is
turned off (high impedance) when the device is in shut-
down mode. When the power is off, the MAX3222/
MAX3232/MAX3237/MAX3241 permit the outputs to be
driven up to ±12V.
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or V
In normal operating mode (MBAUD = GND), the
MAX3237 transmitters guarantee a 250kbps data rate
with worst-case loads of 3kΩ in parallel with 1000pF.
This provides compatibility with PC-to-PC communica-
tion software, such as Laplink.
For higher speed serial communications, the MAX3237
features MegaBaud operation. In MegaBaud operating
mode (MBAUD = V
antee a 1Mbps data rate with worst-case loads of 3kΩ in
parallel with 250pF for 3.0V < V
operation, the MAX3237 transmitters guarantee a 1Mbps
data rate into worst-case loads of 3kΩ in parallel with
1000pF.
C1
C2
V
0V
CC
V
CC
MAXIMUM SLEW-RATE TEST CIRCUIT
0.1µF
SHDN
T_ IN
R_ OUT
EN
C1+
C1-
C2+
C2-
*
MAX3237 MegaBaud Operation
*
CC
MAX3222
MAX3232
MAX3237
MAX3241
), the MAX3237 transmitters guar-
GND
V
CC
5kΩ
CC
T_ OUT
R_ IN
CC
< 4.5V. For 5V ±10%
V+
V-
.
7kΩ
C3
C4
150pF
7

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