Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS232 2/2 SSOP 20

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

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.

________________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

±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

19-1339; Rev 10; 3/11

PART

MAX3224E

MAX3225E

MAX3226E

1/1

2/2

NO. OF

DRIVERS/

RECEIVERS

READY

OUTPUT

✔

Auto-

Shutdown

Plus

✔

250k

GUARANTEED

DATA RATE

(bps)

MAX3227E

MAX3244E

MAX3245E

3/5

1/1

✔

—

✔

250k

Ordering Information continued at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

AutoShutdown Plus, MegaBaud, and UCSP are trademarks of

Maxim Integrated Products, Inc.

_____________________ Selector Guide

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX3224ECTP+ 0°C to +70°C 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

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/

MAX3244E/MAX3245E

Summary of content (21 pages)

PAGE 1
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ E L AVAILAB 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.
PAGE 2
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V 20-Pin TQFN (derate 21.3mW/°C above +70°C) ....1702.1mW V+ to GND (Note 1) ..................................................-0.3V to +7V 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW V- to GND (Note 1) .......................................
PAGE 3
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ELECTRICAL CHARACTERISTICS (continued) (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus __________________________________________Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.
PAGE 6
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus _____________________________Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) 10 8 6 4 1000 2000 3000 4000 0 1000 2000 3000 4000 0 1000 1.5Mbps 1Mbps 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE -2.
PAGE 7
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ______________________________________________________________ Pin Description PIN MAX3224E MAX3225E TQFN DIP/ SSOP/ TSSOP MAX3226E MAX3227E TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP MAX3245E TQFN NAME FUNCTION Ready to Transmit Output, active-high. READY is enabled high when V- goes below -4V and the device is ready to transmit.
PAGE 8
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description (continued) PIN MAX3224E MAX3225E TQFN DIP/ SSOP/ TSSOP MAX3226E MAX3227E TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP NAME FUNCTION Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1).
PAGE 9
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus POWERMANAGEMENT UNIT OR KEYBOARD CONTROLLER VCC FORCEOFF FORCEON INVALID PROTECTION DIODE MAX3244E MAX3245E PREVIOUS RS-232 VCC I Rx 5kΩ UART Tx CPU GND I/O CHIP WITH UART SHDN = GND RS-232 a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC TO μP LOGIC TRANSITION DETECTOR Figure 1.
PAGE 10
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Table 1.
PAGE 11
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +0.3V T_IN R_IN 30μs TIMER R -0.3V INVALID R_IN EDGE DETECT S 30s TIMER EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30μs. Figure 3a. INVALID Functional Diagram, INVALID Low FORCEOFF AUTOSHDN R FORCEON Figure 3c. AutoShutdown Plus Logic +2.7V FORCEOFF POWERDOWN* FORCEON 30μs TIMER R -2.
PAGE 12
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RECEIVER INPUTS INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INVALID OUTPUT VCC tINVL 0 tINVH tAUTOSHDN tAUTOSHDN tWU tWU *VCC READY 0 V+ VCC 0 V- *MAX3224E–MAX3227E Figure 4b.
PAGE 13
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50MΩ to 100MΩ RD 1500Ω DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR DEVICE UNDER TEST STORAGE CAPACITOR Figure 6a. Human Body ESD Test Model HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7a.
PAGE 14
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E–MAX3227E, MAX3244E/MAX3245E help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-protection components.
PAGE 15
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus transmitter is loaded with 3kΩ in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3V. 5V/div T1IN High Data Rates The MAX3224E/MAX3226E/MAX3244E maintain the RS-232 ±5.
PAGE 16
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +3.3V 26 0.1μF 28 C1 0.1μF 24 1 C2 0.1μF 2 LOGIC INPUTS VCC 27 C1+ V+ C3 0.1μF C1C2+ MAX3244E MAX3245E COMPUTER SERIAL PORT 3 V- C4 0.
PAGE 17
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Mouse Driveability TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 VOUT+ VCC = 3.0V 2 1 The MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech.
PAGE 18
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________________Typical Operating Circuits +3.3V +3.3V 15 0.1μF CBYPASS 2 C1+ C1 0.1μF 4 5 C2 0.1μF 6 C1C2+ 3 V+ MAX3226E* MAX3227E V- 9 R1OUT C3 0.1μF C1 0.1μF C4 0.1μF C2 0.1μF 7 C2- 11 T1IN 12 READY AutoShutdown Plus 24 1 2 27 V+ C3 0.1μF C1C2+ MAX3244E*** MAX3245E V- 3 C4 0.
PAGE 19
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.
PAGE 20
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.
PAGE 21
MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Revision History REVISION NUMBER REVISION DATE 10 3/11 DESCRIPTION Added an automotive qualified part to the Ordering Information; changed all the parts listed in the Ordering Information to lead free PAGES CHANGED 1, 20 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.