MAX3221E/
MAX3223E/MAX3243E
±±15k ꢀEDꢁ-rotected, ±µA, 3.0k to 1.1k, 2105bps,
REꢁ232 Transceivers with AutoEhutdown
General Description
Next Generation Device Features
The MAX3221E/MAX3223E/MAX3243E 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 1ꢀkV using IEꢁ 1ꢂꢂꢂ-4-2 Air-
Gap Discharge, to 8kV using IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact
Discharge, and to 1ꢀkV using the ꢃuman ꢄodꢅ Model.
o For Space-Constrained Applications:
MAX3228E/MAX3229E: 15kV ESD-Protected, +2.5V
to +5.5V RS-232 Transceivers in UCSP™
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 a UCSP
Package)
The MAX3221E/MAX3223E/MAX3243E achieve a
1µA supplꢅ current with Maxim’s revolutionarꢅ
AutoShutdown™ feature. Theꢅ save power without
changes to the existing ꢄIOS or operating sꢅstem bꢅ enter-
ing low-power shutdown mode when the RS-232 cable is
disconnected, or when the transmitters of the connected
peripherals are off.
o For 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
The transceivers have a proprietarꢅ low-dropout trans-
mitter output stage, delivering true RS-232 performance
from a +3.ꢂV to +ꢀ.ꢀV supplꢅ with a dual charge pump.
The charge pump requires onlꢅ four small ꢂ.1µF capaci-
tors for operation from a +3.3V supplꢅ. Each device is
guaranteed to run at data rates of 2ꢀꢂkbps while main-
taining RS-232 output levels.
PART
TEMP RANGE
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
ꢂ°ꢁ to +7ꢂ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
-4ꢂ°ꢁ to +8ꢀ°ꢁ
PIN-PACKAGE
16 TQFN-EP*
16 TSSOP
16 SSOP
MAX3221EꢁTE+
MAX3221EꢁUE+
MAX3221EꢁAE+
MAX3221EEAE+
MAX3221EETE+
MAX3221EEUE+
MAX3223EꢁPP+
MAX3223EꢁAP+
MAX3223EꢁUP+
MAX3223EꢁTP+
MAX3223EEPP+
MAX3223EEAP+
MAX3223EEUP+
MAX3223EETP+
16 SSOP
16 TQFN-EP*
16 TSSOP
2ꢂ PDIP
The MAX3221E contains just one driver and one receiver,
making it the smallest single-supplꢅ RS-232 transceiver.
The MAX3223E has two drivers and two receivers. The
MAX3243E is a complete 3-driver/ꢀ-receiver serial port
ideal for notebook or subnotebook computers. It also
includes two noninverting receiver outputs that are alwaꢅs
active, allowing external devices to be monitored without
forward biasing the protection diodes in circuitrꢅ that maꢅ
be powered down.
2ꢂ SSOP
2ꢂ TSSOP
2ꢂ TQFN-EP*
2ꢂ PDIP
2ꢂ SSOP
2ꢂ TSSOP
2ꢂ TQFN-EP*
2ꢂ TSSOP
The MAX3221E, MAX3223E, and MAX3243E are avail-
able in space-saving TQFN, SSOP, and TSSOP pack-
ages.
MAX3223EEUP/V+
*Exposed pad.
+Denotes a lead(Pb)-free/RoꢃS-compliant package.
/V denotes an automotive qualified part.
Applications
Notebook, Subnotebook, and Palmtop ꢁomputers
ꢁellular Phones
Ordering Information continued at end of data sheet.
ꢄatterꢅ-Powered Equipment
ꢃandheld Equipment
Peripherals
Eelector Guide
NO. OF
DRIVERS/
RECEIVERS
VCC
PART
RANGE
(V)
AutoShutdown
Printers
MAX3221E
MAX3223E
MAX3243E
1/1
2/2
3/5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
ꢀ
ꢀ
ꢀ
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
AutoShutdown and UꢁSP are trademarks of Maxim Integrated Products, Inc.
†
ꢁovered bꢅ U.S. Patent numbers 4,636,93ꢂ; 4,679,134; 4,777,ꢀ77; 4,797,899; 4,8ꢂ9,1ꢀ2; 4,897,774; 4,999,761; ꢀ,649,21ꢂ; and other patents pending.
For pricing, delivery, and ordering information, please contact Maxim Direct
19-1283; Rev 7; 8/11
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.