±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

Mouse Driveability

The MAX3244E/MAX3245E are specifically designed to

power serial mice while operating from low-voltage

power supplies. They have been tested with leading

mouse brands from manufacturers such as Microsoft

and Logitech. The MAX3244E/MAX3245E successfully

drove all serial mice tested and met their respective

current and voltage requirements. The MAX3244E/

MAX3245E dual charge pump ensures the transmitters

supply at least ±5V during worst-case conditions.

Figure 13b shows the transmitter output voltages under

increasing load current. Figure 13a shows a typical

mouse connection.

Interconnection with 3V and 5V Logic

The MAX3224E–MAX3227E/MAX3244E/MAX3245E can

directly interface with various 5V logic families, includ-

ing ACT and HCT CMOS. See Table 4 for more informa-

tion on possible combinations of interconnections.

Table 5 lists other Maxim ESD-powered transceivers.

SYSTEM

POWER-SUPPLY

VOLTAGE (V)

COMPATIBILITY

3.3

Compatible with all CMOS families

5

Compatible with all TTL and CMOS families

VOLTAGE

(V)

3.3

5

5

Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS

3.3

PART

SUPPLY

VOLTAGE

RANGE

(V)

NO.

OF

Tx/Rx

GUARANTEED

DATA RATE

(kbps)

MAX3241E

+3.0 to +5.5

3/5

250

MAX3243E

+3.0 to +5.5

3/5

250

MAX3244E

+3.0 to +5.5

3/5

250

MAX3245E

+3.0 to +5.5

3/5

1Mbps

MAX3232E

+3.0 to +5.5

2/2

250

MAX3222E

+3.0 to +5.5

2/2

250

MAX3223E

+3.0 to +5.5

2/2

250

MAX3224E

+3.0 to +5.5

2/2

250

MAX3225E

+3.0 to +5.5

2/2

1Mbps

MAX3221E

+3.0 to +5.5

1/1

250

MAX3227E

+3.0 to +5.5

1/1

1Mbps

MAX3226E

+3.0 to +5.5

1/1

250

SUPPLY

CURRENT

(

300

1

1

1

300

300

1

1

1

1

1

1

Auto-

Shutdown

Plus

—

—

Yes

Yes

—

—

—

Yes

Yes

—

Yes

Yes

Auto-

Shutdown

—

Yes

—

—

—

—

Yes

—

—

Yes

—

—

Human

Body

Model

(kV)

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

IEC 1000-4-2

Contact

Discharge

(kV)

±8

±8

±8

±8

±8

±8

±8

±8

±8

±8

±8

±8

IEC 1000-4-2

Air-Gap

Discharge

(kV)

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

±15

Figure 13b. MAX324_E Transmitter Output Voltage vs. Load

Current per Transmitter

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

0

123456789

10

LOAD CURRENT PER TRANSMITTER (mA)

Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim

Table 4. Logic Family Compatibility with Various Supply Voltages

Maxim Integrated

17

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/MAX3244E/MAX3245E