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DIN

DOUT

Auto-Powerdown

Plus

INVALID

RIN

FORCEOFF

FORCEON

ROUT

11

16

9

13

10

8

1

12

READY

MAX3227E

3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER

WITH

±15-kV IEC ESD PROTECTION

SLLS715A – FEBRUARY 2006 – REVISED JUNE 2007

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

C1+

2

Positive terminal of voltage-doubler charge-pump capacitor

C1–

4

Negative terminal of voltage-doubler charge-pump capacitor

C2+

5

Positive terminal of inverting charge-pump capacitor

C2–

6

Negative terminal of inverting charge-pump capacitor

DIN

11

CMOS driver input

DOUT

13

RS-232 driver output

Force-off input, active low. Drive low to shut down drivers, receivers, and charge pump. This overrides auto-shutdown

FORCEOFF

16

and FORCEON (see Function Table).

Force-on input, active high. Drive high to override powerdown, keeping drivers and receivers on (FORCEOFF must

FORCEON

12

be high) (see Function Table).

GND

14

Ground

INVALID

10

Valid signal detector output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input.

Ready to transmit output, active high. READY is enabled high when V– goes below –3.5 V and the device is ready to

READY

1

transmit.

RIN

8

RS-232 receiver input

ROUT

9

CMOS receiver output

V+

3

+2

× V

V–

7

–2

× V

15

3-V to 5.5-V single-supply voltage

LOGIC DIAGRAM (POSITIVE LOGIC)

3

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