+2.5V to +5.5V RS-232 Transceivers

in UCSP

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5

PIN

MAX3228

MAX3229

NAME

FUNCTION

A1

A1

+2.5V to +5.5V Supply Voltage

A2

A2

C2+

Positive Terminal of Inverting Charge-Pump Capacitor

A3

A3

C2-

Negative Terminal of Inverting Charge-Pump Capacitor

A4

A4

V-

-5.5V/-4.0V Generated by Charge Pump

A5

A5

A6, B6

A6

T_IN

Transmitter Input(s)

B1

B1

V+

+5.5V/+4.0V Generated by Charge Pump. If charge pump is generating +4.0V, the part

has switched from RS-232 compliant to RS-232 compatible mode.

B2, B3, B4,

C2, C3, C4,

D2, D3, D4,

D5

B2, B3, B4,

C2, C3, C4,

D2, D3, D4,

D5

N.C.

No Connection. These locations are not populated with solder bumps.

B5

B5

FORCEON

FORCEON Input, Active-High. Drive FORCEON high to override automatic circuitry,

keeping transmitters and charge pumps on. Pulls itself high internally if not connected.

—

B6, D6,

E4, E6

N.C.

No Connection. These locations are populated with solder bumps, but are electrically

isolated.

C1

C1

C1+

Positive Terminal of Positive Regulated Charge-Pump Capacitor

Pin Description

Typical Operating Characteristics (continued)

0

6

4

2

8

10

12

14

16

18

20

2.5

3.5

3.0

4.0

4.5

5.0

5.5

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE (MAX3229)

SUPPLY VOLTAGE (V)

-8

-4

-6

2

0

-2

8

6

4

10

2.5

3.5

3.0

4.0

4.5

5.0

5.5

TRANSMITTER OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE (V)

-8

-4

-6

2

0

-2

8

6

4

10

2.5

3.5

3.0

4.0

4.5

5.0

5.5

TRANSMITTER OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE (V)