ICL3225, ICL3227, ICL3245
®
Data Sheet
June 2003
FN4878.4
1 Microamp, +3V to +5.5V, 1Mbps, RS-232
Transceivers with Enhanced Automatic
Powerdown
Features
• ±15kV ESD Protected (Human Body Model)
• Manual and Enhanced Automatic Powerdown Features
The Intersil ICL32XX devices are 3.0V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
• Drop in Replacements for MAX3225, MAX3227,
MAX3245
V.28/V.24 specifications, even at V
= 3.0V. Targeted
CC
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
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 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.
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Guaranteed Mouse Driveability (ICL3245)
• “Ready to Transmit” Indicator Output (ICL3225, ICL3227)
• 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. . . . . . . . . . .1µA
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
Applications
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.
• 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 device represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the
ICL32XX 3V family.
- Cellular/Mobile Phones
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
TABLE 1. SUMMARY OF FEATURES
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
NO. OF
MONITOR Rx.
DATA
RATE
(kbps)
MANUAL
POWER-
DOWN?
PART
NUMBER
NO. OF NO.OF
Rx. ENABLE
FUNCTION?
READY
OUTPUT?
Tx.
Rx.
(R
)
OUTB
ICL3225
ICL3227
ICL3245
2
2
0
1000
1000
1000
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
1
1
0
1
3
5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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1
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