2

FN6045.2

April 13, 2007

Ordering Information

PART

NUMBER

PART

MARKING

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL4221EIR*

ISL 4221EIR

-40 to +85

16 Ld QFN

L16.5x5

ISL4221EIRZ* (Note)

ISL4221 EIRZ

-40 to +85

16 Ld QFN (Pb-free)

L16.5x5

ISL4223EIR*

ISL 4223EIR

-40 to +85

20 Ld QFN

L20.5x5

ISL4223EIRZ* (Note)

ISL4223 EIRZ

-40 to +85

20 Ld QFN (Pb-free)

L20.5x5

*Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

Pinouts

ISL4221E

(16 LD QFN)

TOP VIEW

ISL4223E

(20 LD QFN)

TOP VIEW

1

3

4

15

V+

C1-

C2+

C2-

16

14

13

2

12

10

9

11

6

57

8

GND

FORCEON

V+

C1-

C2+

C2-

V-

FORCEON

1

2

3

4

5

78

9

10

6

20

19

18

17

16

13

14

15

12

11

Pin Descriptions

PIN

FUNCTION

System power supply input (2.7V 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.

TTL/CMOS level receiver outputs.

INVALID

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

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).

EN

Active low receiver enable control.

ISL4221E, ISL4223E