MAX3232CSE データシートの表示（PDF） - Maxim Integrated

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MAX3232CSE

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors

Maxim Integrated 

MAX3222/MAX3232/MAX3237/MAX3241

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

_______________Detailed Description

Dual Charge-Pump Voltage Converter

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 (VCC) over the 3.0V to 5.5V range. The

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.

RS-232 Transmitters

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.

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 VCC.

MAX3237 MegaBaud Operation

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 = VCC), the MAX3237 transmitters guar-

antee a 1Mbps data rate with worst-case loads of 3kΩ in

parallel with 250pF for 3.0V < VCC < 4.5V. For 5V ±10%

operation, the MAX3237 transmitters guarantee a 1Mbps

data rate into worst-case loads of 3kΩ in parallel with

1000pF.

VCC

0.1µF

VCC

0.1µF

C1+

VCC

V+

C1

C3

C1-

MAX3222

C2+

MAX3232

V-

C2

MAX3237

C4

C2-

MAX3241

T_ IN

T_ OUT

C1+

VCC

V+

C1

C3

C1-

MAX3222

C2+

MAX3232

V-

C2

MAX3237

C4

C2-

MAX3241

T_ IN

T_ OUT

R_ OUT

R_ IN

0V

EN*

5kΩ

VCC

SHDN*

GND

3kΩ

2500pF

R_ OUT

R_ IN

0V

EN*

5kΩ

VCC

SHDN*

GND

7kΩ

150pF

* MAX3222/MAX3241 ONLY

MINIMUM SLEW-RATE TEST CIRCUIT

Figure 1. Slew-Rate Test Circuits

MAXIMUM SLEW-RATE TEST CIRCUIT

Maxim Integrated

7

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