Datasheet
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
±15kV ESD Protected, +3V to +5.5V, 1µA, 250kbps, RS-232 Transmitters/Receivers
The ICL3221E, ICL3222E, ICL3223E, ICL3232E,
ICL3241E, and ICL3243E are 3.0V to 5.5V powered
RS-232 transmitters/receivers that meet ElA/TIA-232
Features
• ESD protection for RS-232 I/O pins to ±15kV
(IEC61000)
and V.28/V.24 specifications, even at V = 3.0V.
CC
• Drop-in replacements for the MAX3221E,
MAX3222E, MAX3223E, MAX3232E, MAX3241E,
MAX3243E, and SP3243E
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 notebook and laptop
computers in which the low operational power
consumption and even lower standby power
consumption is critical. Efficient on-chip charge
pumps, coupled with manual and automatic
power-down functions (except for the ICL3232E),
reduce the standby supply current to a 1µA trickle.
Small footprint packaging and the use of small, low
value capacitors ensure board space savings. Data
rates greater than 250kbps are ensured 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 ICL3221E is a low-power, pin-compatible
upgrade for the 5V MAX221E
• The ICL3222E is a low-power, pin-compatible
upgrade for the 5V MAX242E and SP312E
• The ICL3232E is a low-power upgrade for the
HIN232E, ICL232, and pin-compatible competitor
devices
• RS-232 compatible with V = 2.7V
CC
• Meets EIA/TIA-232 and V.28/V.24 specifications
at 3V
• Latch-up free
The ICL324XE are 3-driver, 5-receiver devices that
provide a complete serial port suitable for laptop or
notebook computers. Both devices also include
noninverting always-active receivers for “wake-up”
capability.
• On-chip voltage converters require only four
external 0.1µF capacitors at V = 3.3V
CC
• Manual and automatic power-down features
• Ensured mouse driveability (ICL324xE only)
• Receiver hysteresis for improved noise immunity
• Ensured minimum data rate: 250kbps
The ICL3221E, ICL3223E, and ICL3243E feature an
automatic power-down function that powers down the
on-chip power supply and driver circuits. Power-down
occurs when an attached peripheral device is shut off
or the RS-232 cable is removed, which conserves
system power automatically without changes to the
hardware or operating system. These devices power
up again when a valid RS-232 voltage is applied to
any receiver input.
• Wide power supply range: single +3V to +5.5V
• Low supply current in power-down state: 1µA
• Pb-free (RoHS compliant)
Applications
• Any system requiring RS-232 communication ports
Table 1 on page 2 summarizes the features of the
devices represented by this datasheet, and
Application Note AN9863 summarizes the features of
each device in the ICL32xxE 3V family.
○ Battery powered, hand-held, and portable
equipment
○ Laptop computers and notebooks
○ Modems, printers, and other peripherals
○ Digital cameras
Related Literature
For a full list of documents, visit our website:
○ Cellular/mobile phones
• ICL3221E, ICL3222E, ICL3223E, ICL3232E,
ICL3241E, and ICL3243E device pages
FN4910 Rev.24.00
May 30, 2019
Page 1 of 39
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