1

®

FN4878.8

ICL3225, ICL3245

1 Microamp, +3V to +5.5V, 1Mbps, RS-232

Transceivers 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 1Mbps 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 ICL3245 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

30s. These devices power back up, automatically, whenever

they sense 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

ICL32XX 3V family.

Features

• Manual and Enhanced Automatic Powerdown Features

• Drop in Replacements for MAX3225, MAX3245

• 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 (ICL3245)

• “Ready to Transmit” Indicator Output (ICL3225)

• Receiver Hysteresis For Improved Noise Immunity

• Guaranteed Minimum Data Rate . . . . . . . . . . . . . . 1Mbps

• Low Skew at Transmitter/Receiver Input Trip Points . . . 10ns

• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . 24V/

µs

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

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

µA

•

Pb-Free Plus Anneal Available (RoHS Compliant)

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?

ICL3225

2

2

0

1000

No

Yes

Yes

Yes

ICL3245

3

5

1

1000

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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