Datasheet
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
One Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232
Transmitters/Receivers
The ICL3221, ICL3222, ICL3223, ICL3232, ICL3241,
ICL3243 (ISL32xx) devices are 3.0V to 5.5V powered
RS-232 transmitters/receivers that meet ElA/TIA-232
Features
• RoHS Compliant
• 15kV ESD protected (Human Body Model)
and V.28/V.24 specifications, even at V = 3.0V.
CC
Targeted applications are PDAs, notebook, and laptop
computers where the low operational power
consumption and even lower standby power
consumption are critical. Efficient on-chip charge
pumps, coupled with manual and automatic
power-down functions (except for the ICL3232),
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 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.
• Drop-in replacements for MAX3221, MAX3222,
MAX3223, MAX3232, MAX3241, MAX3243,
SP3243
• ICL3221 is a low-power, pin compatible upgrade for
5V MAX221
• ICL3222 is a low-power, pin compatible upgrade for
5V MAX242, and SP312A
• ICL3232 is a low-power upgrade for HIN232/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
The ICL324x 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.
• Latch-up free
• On-chip voltage converters require only four
external 0.1µF capacitors
• Manual and automatic powerdown features (except
ICL3232)
The ICL3221, ICL3223 and ICL3243 feature an
automatic powerdown 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, conserving 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.
• Assured mouse driveability (ICL324x only)
• Receiver hysteresis for improved noise immunity
• Assured minimum data rate: 250kbps
• Assured minimum slew rate: 6V/μs
• Wide power supply range: single +3V to +5.5V
• Low supply current in powerdown state:1µA
Table 1 on page 6 summarizes the features of the
devices represented by this datasheet, while
Application Note AN9863 summarizes the features of
each device comprising the ICL32xx 3V family.
Applications
• Any system requiring RS-232 communication ports
○ Battery powered, hand-held, and portable
equipment
Related Literature
For a full list of related documents, visit our website:
○ Laptop computers, Notebooks
○ Modems, printers, and other peripherals
○ Digital cameras
• ICL3221, ICL3222, ICL3223, ICL3232, ICL3241,
and ICL3243 device pages
○ Cellular/mobile phones
FN4805 Rev.23.00
Apr.26.19
Page 1 of 36
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