ICL3224, ICL3226, ICL3238, ICL3244
®
Data Sheet
March 1, 2006
FN4876.10
1 Microamp, +3V to +5.5V, 250kbps ,
RS-232 Trans ceivers with Enhanced
Automatic Powerdown
Features
• Pb-Free Plus Anneal Available (RoHS Compliant)
• ±15kV ESD Protected (Human Body Model)
The Intersil ICL32XX devices are 3.0V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3224, MAX3226,
MAX3238, MAX3244
V.28/V.24 specifications, even at V
= 3.0V. Targeted
CC
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.
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• RS-232 Compatible with V
= 2.7V
CC
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Flow-Through Pinout (ICL3238)
• Guaranteed Mouse Driveability (ICL3244)
• “Ready to Transmit” Indicator Output (ICL3224/26)
• 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
The ICL3244 is a 3 driver, 5 receiver device that provides a
complete serial port suitable for laptop or notebook
computers. The ICL3244/38 also include a noninverting
always-active receiver for RING INDICATOR monitoring.
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
30sec. These devices power back up, automatically,
whenever they sense a transition on any transmitter or
receiver input.
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
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
ICL32XX 3V family.
- Cellular/Mobile Phones
- Data Cradles
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• AN9863, “3V to +5.5V, 250k-1Mbps, RS-232
Transmitters/Receivers”
TABLE 1. SUMMARY OF FEATURES
DATA
NO. OF
MONITOR Rx.
MANUAL
POWER-
DOWN?
ENHANCED
AUTOMATIC
POWERDOWN
PART
NO. OF NO.OF
RATE
Rx. ENABLE
FUNCTION?
READY
OUTPUT?
NUMBER
Tx.
Rx.
(R
)
(kbps)
OUTB
ICL3224
ICL3226
ICL3238
ICL3244
2
2
0
250
NO
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
1
1
0
1
1
250
5
3
250
3
5
250
NO
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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