MAX3224–MAX3227/
MAX3244/MAX3245
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224–MAX3227/MAX3244/MAX3245 are 3Vpowered EIA/TIA-232 and V.28/V.24 communications
interfaces with automatic shutdown/wakeup features
and high data-rate capabilities.
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 MAX3225/MAX3227/MAX3245 also feature
MegaBaud™ operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN
modems. The MAX3224/MAX3226/MAX3244 guarantee
250kbps operation. The transceivers have a proprietary
low-dropout transmitter output stage enabling true RS232 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 MAX3224–MAX3227 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,
TSSOP, and SSOP packages.
________________________Applications
Functional Diagrams
Notebook, Subnotebook, and Palmtop Computers
_Next Generation Device Features
♦ For Smaller Packaging:
MAX3228/MAX3229: +2.5V to +5.5V RS-232
Transceivers in UCSP™
♦ For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2 Tx/2 Rx RS-232 Transceivers with ±15kV ESDProtected I/O and Logic Pins
♦ For Integrated ESD Protection:
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: ±15kV ESD-Protected, Down to 10nA,
+3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in UCSP)
_______________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3224CPP+
0°C to +70°C
20 PDIP
MAX3224CAP+
0°C to +70°C
20 SSOP
MAX3224CTP+
0°C to +70°C
20 TQFN-EP*
MAX3224CUP+
0°C to +70°C
20 TSSOP
MAX3224EPP+
-40°C to +85°C
20 PDIP
MAX3224EAP+
-40°C to +85°C
20 SSOP
MAX3224ETP+
-40°C to +85°C
20 TQFN-EP*
MAX3224EUP+
-40°C to +85°C
20 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Cellular Phones
Battery-Powered Equipment
_____________________ Selector Guide
Handheld Equipment
PART
Peripherals
Printers
NO. OF
GUARANTEED
READY
DRIVERS/
DATA RATE
OUTPUT
RECEIVERS
(bps)
AutoShutdown
Plus
MAX3224
2/2
250k
✔
✔
MAX3225
2/2
1M
✔
✔
✔
MAX3226
1/1
250k
✔
MAX3227
1/1
1M
✔
✔
MAX3244
3/5
250k
—
✔
MAX3245
3/5
1M
—
✔
Pin Configurations appear at end of data sheet.
AutoShutdown Plus, MegaBaud, and UCSP are trademarks
Functional DiagramsProducts, Inc. end of data sheet.
of Maxim Integrated continued at
UCSP is 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.
19-1289; Rev 5; 2/11
