2

Ordering Information

PART NO.

TEMP. RANGE (°C)

PACKAGE

PKG. DWG. #

ISL4221EIR

-40 to 85

16 Ld QFN

L16.5x5

ISL4221EIR-T

-40 to 85

16 Ld QFN

Tape & Reel

L16.5x5

ISL4221EIRZ-T

(Note)

-40 to 85

16 Ld QFN

Tape & Reel

(Pb-free)

L16.5x5

ISL4223EIR

-40 to 85

20 Ld QFN

L20.5x5

ISL4223EIRZ

(Note)

-40 to 85

20 Ld QFN

(Pb-free)

L20.5x5

ISL4223EIR-T

-40 to 85

20 Ld QFN

Tape & Reel

L20.5x5

ISL4223EIRZ-T

(Note)

-40 to 85

20 Ld QFN

Tape & Reel

(Pb-free)

L20.5x5

NOTE: Intersil Pb-free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which is 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-020B.

PART NO.

TEMP. RANGE (°C)

PACKAGE

PKG. DWG. #

Pinouts

ISL4221E (QFN)

TOP VIEW

ISL4223E (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