MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224E/MAX3225E/MAX3226E/MAX3227E/
MAX3244E/MAX3245E are 3V-powered EIA/TIA-232
and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD)
protection. All transmitter outputs and receiver inputs
are protected to ±15kV using IEC 1000-4-2 Air-Gap
Discharge, ±8kV using IEC 1000-4-2 Contact Discharge,
and ±15kV using the Human Body Model.
All devices achieve a 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These
devices automatically enter a low-power shutdown
mode when the RS-232 cable is disconnected or the
transmitters of the connected peripherals are inactive,
and the UART driving the transmitter inputs is inactive
for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system.
The MAX3225E/MAX3227E/MAX3245E also feature
MegaBaud™ operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN
modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling
true RS-232 performance from a +3.0V to +5.5V supply
with a dual charge pump. The charge pump requires
only four small 0.1µF capacitors for operation from a
3.3V supply. The MAX3224E–MAX3227E feature a logiclevel output (READY) that asserts when the charge
Functional Diagrams
pump is regulating and the device is ready to begin
transmitting.
All devices are available in a space-saving TQFN,
SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/
MAX3245E) packages.
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
__Next Generation Device Features
♦ For Space-Constrained Applications:
MAX3228E/MAX3229E: ±15kV ESD-Protected,
+2.5V to +5.5V, RS-232 Transceivers in UCSP™
MAX3222E/MAX3232E/MAX3241E/MAX3246E:
±15kV ESD-Protected, Down to 10nA, +3.0V to
+5.5V, Up to 1Mbps, True RS-232 Transceivers
(MAX3246E Available in UCSP)
♦ For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
Ordering Information
PART
TEMP RANGE
MAX3224ECTP+
0°C to +70°C
PIN-PACKAGE
20 TQFN-EP*
MAX3224ECUP+
0°C to +70°C
20 TSSOP
MAX3224ECAP+
0°C to +70°C
20 SSOP
MAX3224ECPP+
0°C to +70°C
20 Plastic DIP
MAX3224EETP+
-40°C to +85°C
20 TQFN-EP*
MAX3224EEUP+
-40°C to +85°C
20 TSSOP
MAX3224EEAP+
-40°C to +85°C
20 SSOP
MAX3224EEPP+
-40°C to +85°C
20 Plastic DIP
MAX3224EAAP+
-40°C to +125°C 20 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART
NO. OF
GUARANTEED
READY
DRIVERS/
DATA RATE
OUTPUT
RECEIVERS
(bps)
AutoShutdown
Plus
MAX3224E
2/2
250k
✔
✔
MAX3225E
MAX3226E
MAX3227E
2/2
1/1
1/1
1M
250k
1M
✔
✔
✔
✔
✔
✔
MAX3244E
MAX3245E
3/5
3/5
250k
1M
—
—
✔
✔
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
AutoShutdown Plus, MegaBaud, and UCSP are trademarks of
UCSP isIntegrated Products, Inc.
Maxim a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1339; Rev 10; 3/11
