DIN2

DIN1

DOUT2

DOUT1

Auto-Power-Down Plus

INVALID

RIN1

RIN2

FORCEOFF

FORCEON

ROUT1

ROUT2

13

12

20

14

15

10

17

8

11

16

9

5 k

5 k

Ω

Ω

READY

1

MAX3318

www.ti.com

SLLS687A – OCTOBER 2005 – REVISED OCTOBER 2013

LOGIC DIAGRAM (POSITIVE LOGIC)

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

C1+

2

Positive voltage-doubler charge-pump capacitor

C1–

4

Negative voltage-doubler charge-pump capacitor

C2+

5

Positive inverting charge-pump capacitor

C2–

6

Negative inverting charge-pump capacitor

DIN

12, 13

CMOS driver inputs

DOUT

8, 17

RS-232 driver outputs

Force-off input, active low. Drive low to power down transmitters and charge pump. This overrides auto power

FORCEOFF

20

down and FORCEON (see Function Table).

Force-on input, active high. Drive high to override auto power down, keeping transmitters on (FORCEOFF

FORCEON

14

must be high) (see Function Table).

GND

18

Ground

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

INVALID

11

input.

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

READY

1

ready to transmit.

RIN

9, 16

RS-232 receiver inputs

ROUT

10, 15

CMOS receiver outputs

V+

3

2 × VCC generated by the charge pump

V–

7

–2 × VCC generated by the charge pump

VCC

19

2.25-V to 3-V single-supply voltage

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