4-1

TM

File Number

4876

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

ICL3244

1Microamp, +3V to +5.5V, 250kbps,

RS-232 Transceiver with Enhanced

Automatic Powerdown

The Intersil ICL32XX devices are 3.0V to 5.5V powered

RS-232 transmitters/receivers which meet ElA/TIA-232 and

applications are PDAs, Palmtops, and notebook and laptop

computers where the low operational, and even lower

standby, power consumption is critical. Efficient on-chip

charge pumps, coupled with manual and enhanced

automatic powerdown functions, reduce the standby supply

current to a 1

µA trickle. Small footprint packaging, and the

use of small, low value capacitors ensure board space

savings as well. Data rates greater than 250kbps are

guaranteed at worst case load conditions. This family is fully

compatible with 3.3V only systems, mixed 3.3V and 5.0V

systems, and 5.0V only systems.

The ICL3244 is a 3 driver, 5 receiver device that provides a

complete serial port suitable for laptop or notebook

computers. It also includes a noninverting always-active

receiver for “wake-up” capability.

This device, features an enhanced automatic powerdown

function which powers down the on-chip power-supply and

driver circuits. This occurs when all receiver and transmitter

inputs detect no signal transitions for a period of 30s. The

ICL3244 powers back up, automatically, whenever it senses

a transition on any transmitter or receiver input.

Table 1 summarizes the features of the device represented

by this data sheet, while Application Note AN9863

summarizes the features of each device comprising the

ICL3244 3V family.

Features

• Manual and Enhanced Automatic Powerdown Features

• Drop in Replacement for MAX3244

• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V

• Latch-Up Free

• On-Chip Voltage Converters Require Only Four External

0.1

µF Capacitors

• Guaranteed Mouse Driveability

• Receiver Hysteresis For Improved Noise Immunity

• Guaranteed Minimum Data Rate . . . . . . . . . . . . 250kbps

• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/

µs

• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V

• Low Supply Current in Powerdown State . . . . . . . . . . 1

µA

Applications

• Any System Requiring RS-232 Communication Ports

- Battery Powered, Hand-Held, and Portable Equipment

- Laptop Computers, Notebooks, Palmtops

- Modems, Printers and other Peripherals

- Cellular/Mobile Phones

• Related Literature

- Application Note AN9863, “3V to +5.5V, 250k-1Mbps,

RS-232 Transmitters/Receivers”

Pinout

ICL3244 (SOIC, SSOP)

TOP VIEW

Ordering Information

PART NO.

TEMP.

PACKAGE

PKG. NO.

ICL3244CA

0 to 70

28 Ld SSOP

M28.209

ICL3244CB

0 to 70

28 Ld SOIC

M28.3

NOTE: Most surface mount devices are available on tape and reel;

add “-T” to suffix.

C2+

C2-

V-

C1+

GND

C1-

FORCEON

INVALID

V+

FORCEOFF

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

NO. OF

Tx.

NO. OF

Rx.

NO. OF

MONITOR Rx.

DATA

RATE

(kbps)

Rx. ENABLE

FUNCTION?

READY

OUTPUT?

MANUAL

POWER-

DOWN?

ENHANCED

AUTOMATIC

POWERDOWN

FUNCTION?

ICL3244

3

5

1

250

No

No

Yes

Yes

Data Sheet

June 2000