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The Intersil ISL3232E and ISL4221E, ISL4223E devices are

2.7V 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 hand-held

products where the low operational, and even lower standby,

power consumption is critical. Efficient on-chip charge pumps,

coupled with manual and automatic power-down functions,

reduce the standby supply current to a 150nA trickle. Tiny

5mmx5mm Quad Flat No-Lead (QFN) 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.

The ISL4221E is a 1 driver, 1 receiver device and the

ISL3232E and ISL4223E are 2 driver, 2 receiver devices

that, coupled with the 5mmx5mm QFN package, provide the

industry’s smallest, lowest power serial port suitable for

PDAs, and hand-held applications. The 5mmx5mm QFN

requires 40 less board area than a 20 Ld TSSOP, and is

nearly 20 thinner.

The ISL4221E, ISL4223E versions feature an automatic

power-down function that powers down the on-chip power

supply and driver circuits. This occurs when an attached

peripheral device is shut off or the RS-232 cable is removed,

conserving system power automatically without changes to

the hardware or operating system. It powers up again when

a valid RS-232 voltage is applied to any receiver input.

Table 1 summarizes the features of the IC’s, while

Application Note AN9863 summarizes the features of each

device comprising the 3V RS-232 family

Features

? Available in Near Chip Scale QFN (5mmx5mm) Package,

which is 40 Smaller than a 20 Ld TSSOP

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

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

? RS-232 Compatible with VCC = 2.7V

? On-Chip Voltage Converters Require Only Four External

0.1μF Capacitors

? Manual and Automatic Power-down Features (Except

ISL3232E)

? Receiver Hysteresis For Improved Noise Immunity

? Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps

? Wide Power Supply Range . . . . . . Single +2.7V to +5.5V

? Low Supply Current in Power-down State . . . . . . . .150nA

? Pb-Free Available (RoHS Compliant)

Applications

? Any Space Constrained System Requiring RS-232 Ports

- Battery Powered, and Portable Equipment

- Hand-Held Products (GPS Receivers, Bar Code

Scanners, etc.)

- PDAs and Palmtops, Data Cables

- Cellular/Mobile Phones, Digital Cameras