ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243

1. Overview

FN4805 Rev.23.00

Page 8 of 36

Apr.26.19

1.4

Pin Descriptions

Pin

Function

VCC

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.

TIN

TTL/CMOS compatible transmitter Inputs.

TOUT

RS-232 level (nominally

±5.5V) transmitter outputs.

RIN

RS-232 compatible receiver inputs.

ROUT

TTL/CMOS level receiver outputs.

ROUTB

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

Active low receiver enable control; doesn’t disable ROUTB outputs.

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 5 on page 15).

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