________________General Description
The MAX3224E/MAX3225E/MAX3226E/MAX3227E/
MAX3244E/MAX3245E are 3V-powered EIA/TIA-232
and V.28/V.24 communications interfaces with automat-
ic shutdown/wakeup features, high data-rate capabili-
ties, 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 receiv-
er 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 high-
speed applications such as communicating with ISDN
modems. The MAX3224E/MAX3226E/MAX3244E guar-
antee 250kbps operation. The transceivers have a pro-
prietary 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 logic-
level output (READY) that asserts when the charge
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
MAX3224E–MAX3227E/MAX3244E/MAX3245E
†
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________________________________________________________
Maxim Integrated Products
1
PART
MAX3224E
MAX3225E
MAX3226E
1/1
2/2
2/2
NO. OF
DRIVERS/
RECEIVERS
READY
OUTPUT
✔
✔
✔
Auto-
Shutdown
Plus
✔
✔
✔
250k
1M
250k
GUARANTEED
DATA RATE
(bps)
MAX3227E
MAX3244E
MAX3245E
3/5
3/5
1/1 ✔
—
—
✔
✔
✔
1M
250k
1M
Ordering Information continued at end of data sheet.
*
EP = Exposed paddle.
†
C U.S. nurs ; 4,634; 4,777;
4,792; 4,8974; 4,991; 5,640; a er
pg.
AutoShutdown Plus, MegaBaud, and UCSP are trademarks of
Maxim Integrated Products, Inc.
_____________________ Selector Guide
Ordering Information
PART TEMP
RANGE
PIN
PKG
PKG
CODE
MAX3224ECTP 0°C to +70°C20 TQFN-
EP* T2055-5
MAX3224ECUP 0°C to +70°C20 TSSOP —
MAX3224ECAP 0°C to +70°C20 SSOP —
MAX3224ECPP 0°C to +70°C20 Plastic
DIP —
MAX3224EETP -40°C to +85°C20 TQFN-
EP* T2055-5
MAX3224EEUP -40°C to +85°C20 TSSOP —
MAX3224EEAP -40°C to +85°C20 SSOP —
MAX3224EEPP -40°C to +85°C20 Plastic
DIP —
MAX3224EAAP -40°C to +125°C20 SSOP —
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.