ICL3221EM, ICL3221EF

1. Overview

FN7552 Rev.2.00

Page 4 of 22

May.29.19

1.2

Pin Configuration

1.3

Pin Descriptions

16 Ld TSSOP

Top View

Pin

Pin

Number

Function

EN

1

Active low receiver enable control

C1+

2

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

V+

3

Internally generated positive transmitter supply (+5.5V).

C1-

4

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

C2+

5

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

C2-

6

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

V-

7

Internally generated negative transmitter supply (-5.5V).

R1IN

8

±15kV ESD protected, RS-232 compatible receiver inputs.

R1OUT

9

TTL/CMOS level receiver outputs.

INVALID

10

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

T1IN

11

TTL/CMOS compatible transmitter Inputs.

FORCEON

12

Active high input to override automatic powerdown circuitry thereby keeping transmitters active (FORCEOFF

must be high).

T1OUT

13

±15kV ESD protected, RS-232 level (nominally ±5.5V) transmitter outputs.

GND

14

Ground connection.

VCC

15

System power supply input (3.0V to 3.6V).

FORCEOFF

16

Active low to shut down transmitters and on-chip power supply that overrides any automatic circuitry and

FORCEON (see Table 5 on page 11).

EN

C1+

V+

C1-

C2+

C2-

V-

R1IN

FORCEOFF

GND

T1OUT

FORCEON

T1IN

R1OUT

VCC

INVALID

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8