ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243

FN4805 Rev 22.00

Page 4 of 28

September 1, 2015

ICL3243 (SOIC, SSOP, TSSOP)

TOP VIEW

C2+

C2-

V-

C1+

GND

C1-

FORCEON

INVALID

V+

FORCEOFF

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27

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25

24

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21

20

19

18

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15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Pin Descriptions

PIN

FUNCTION

System power supply input (3.0V to 5.5V).

V+

Internally generated positive transmitter supply (+5.5V).

V-

Internally generated negative transmitter supply (-5.5V).

GND

Ground connection.

C1+

External capacitor (voltage doubler) is connected to this lead.

C1-

External capacitor (voltage doubler) is connected to this lead.

C2+

External capacitor (voltage inverter) is connected to this lead.

C2-

External capacitor (voltage inverter) is connected to this lead.

TTL/CMOS compatible transmitter Inputs.

RS-232 level (nominally

5.5V) transmitter outputs.

RS-232 compatible receiver inputs.

TTL/CMOS level receiver outputs.

TTL/CMOS level, noninverting, always enabled receiver outputs.

INVALID

Active low output that indicates if no valid RS-232 levels are present on any receiver input.

EN

SHDN

Active low input to shut down transmitters and on-board power supply, to place device in low power mode.

FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (See Table 2).

FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).