1

®

FN4899.6

ICL3224E, ICL3226E, ICL3244E

+/-15kV ESD Protected, +3V to +5.5V,

1Microamp, 250kbps, RS-232

Transceivers with Enhanced Automatic

Powerdown

The Intersil ICL32XXE devices are 3.0V to 5.5V powered

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

and Human Body Model) on transmitter outputs and receiver

inputs (RS-232 pins). Targeted 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 ICL3244E 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.

These devices, feature 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

30 seconds. These devices power back up, automatically,

whenever they sense a transition on any transmitter or

receiver input.

Table 1 summarizes the features of the devices represented

by this data sheet, while Application Note AN9863

summarizes the features of each device comprising the

ICL32XXE 3V family.

Features

•

Pb-Free Plus Anneal Available (RoHS Compliant)

• Manual and Enhanced Automatic Powerdown Features

• Drop in Replacements for MAX3224E, MAX3226E,

MAX3244E

• 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 (ICL3244E)

• “Ready to Transmit” Indicator Output (ICL3224E/26E)

• 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

- Digital Cameras

- Cellular/Mobile Phones

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

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?

ICL3224E

2

2

0

250

No

Yes

Yes

Yes

ICL3226E

1

1

0

250

No

Yes

Yes

Yes

ICL3244E

3

5

1

250

No

No

Yes

Yes

Data Sheet

February 27, 2006

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

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