The Intersil ICL32XXE devices are 3.0V to 5.5V powered

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

V.28/V.24 specifications, even at VCC = 3.0V. Additionally,

they provide ±15kV ESD protection (IEC61000-4-2 Air Gap

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 1μA 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 powersupply 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

特性 Features

? Pb-Free Plus Anneal Available (RoHS Compliant)

? ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)

? 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

? RS-232 Compatible with VCC = 2.7V

? Latch-Up Free

? On-Chip Voltage Converters Require Only Four External

0.1μF 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 . . . . . . . . . . .1μA

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