Datasheet

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General Description

The MAX3221/MAX3223/MAX3243 achieve 1µA supply

current with Maxim’s revolutionary AutoShutdown™

feature. When the MAX3221/MAX3223/MAX3243 do not

sense a valid signal level on their receiver inputs, the on-

board power supply and drivers shut down. This occurs

if the RS-232 cable is disconnected or if the transmitters

of the connected peripheral are turned off. The system

turns on again when a valid level is applied to any RS-232

receiver input.

The MAX3221/MAX3223/MAX3243 require only 0.1µF

capacitors in 3.3V operation, and can operate from input

voltages ranging from +3.0V to +5.5V.

A proprietary, high-efficiency, dual charge-pump power

supply and a low-dropout transmitter combine to deliver

true RS-232 performance from a single +3.0V to +5.5V

supply.

The MAX3221 is a 1-driver/1-receiver 16-pin SSOP

version of the 20-pin 2-driver/2-receiver MAX3223.

The MAX3243 is a 3-driver/5-receiver with a complementary

always-active receiver for external monitoring in a variety

of 28 pin packages. See Order Information table for

package offerings.

Applications

● Battery-Powered Equipment

● Hand-Held Equipment

● Peripherals

● Portable Diagnostics Equipment

Benets and Features

● Integrated Charge Pump Circuitry Simplifies Power

Requirements

• Eliminates the Need for a ±12 Supply

• Operation From a Single +3.3V or +5V Supply

● 1µA Supply Current in Shutdown Mode Saves Power

• AutoShutdown Feature is Enabled After No Activity

on Receiver Inputs for 30µs

• Software Control Option for Shutdown

19-0306; Rev 10; 5/19

†

Future product—contact factory for availability.

PART TEMP RANGE PIN-PACKAGE

MAX3221CAE 0°C to +70°C 16 SSOP

MAX3221CUE

†

0°C to +70°C 16 TSSOP

MAX3221EAE -40°C to +85°C 16 SSOP

MAX3221EUE

†

-40°C to +85°C 16 TSSOP

MAX3223CPP 0°C to +70°C 20 Plastic DIP

MAX3223CAP 0°C to +70°C 20 SSOP

MAX3223CUP 0°C to +70°C 20 TSSOP

MAX3223EPP -40°C to +85°C 20 Plastic DIP

MAX3223EAP -40°C to +85°C 20 SSOP

MAX3223EUP -40°C to +85°C 20 TSSOP

MAX3243CWI 0°C to +70°C 28 Wide SO

MAX3243CAI 0°C to +70°C 28 SSOP

MAX3243CUI 0°C to +70°C 28 TSSOP

MAX3243EWI -40°C to +85°C 28 Wide SO

MAX3243EAI -40°C to +85°C 28 SSOP

MAX3243EUI -40°C to +85°C 28 TSSOP

PART Tx Rx V

RANGE (V) AutoShutdown

MAX3221 1 1 3.0 to 5.5 Yes

MAX3223 2 2 3.0 to 5.5 Yes

MAX3243 3 5 3.0 to 5.5 Yes

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

AutoShutdown and UCSP are trademarks of Maxim Integrated

Products, Inc.

Ordering Information

Selector Guide

MAX3221/MAX3223/

MAX3243

+3V to +5.5V RS-232

Transceivers with AutoShutdown

Click here for production status of specific part numbers.

Summary of content (16 pages)

PAGE 1
Click here for production status of specific part numbers. MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown General Description The MAX3221/MAX3223/MAX3243 achieve 1µA supply current with Maxim’s revolutionary AutoShutdown™ feature. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the onboard power supply and drivers shut down.
PAGE 2
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Absolute Maximum Ratings VCC...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)...............................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, FORCEOFF, FORCEON, EN (MAX3223)...
PAGE 3
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Electrical Characteristics (continued) (VCC = +3.0V to +5.5V, C1–C4 = 0.1μF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Typical Operating Characteristics 14 -SLEW 12 10 +SLEW 8 6 -4 4 VOUT- -5 2000 3000 4000 4000 MAX3243 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE MAX3243 SLEW RATE vs. LOAD CAPACITANCE 1 TRANSMITTER AT 235kbps 2 TRANSMITTERS AT 30kbps -2.5 VOUT- -5.0 22 20 18 +SLEW 10 8 1000 2000 3000 4000 LOAD CAPACITANCE (pF) www.maximintegrated.com 5000 4 ALL OUTPUTS LOADED WITH 3kW +CL 0.
PAGE 5
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Pin Description PIN NAME FUNCTION MAX3221 MAX3223 MAX3243 1 1 — EN Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-Z state.
PAGE 6
MAX3221/MAX3223/ MAX3243 POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER +3V to +5.5V RS-232 Transceivers with AutoShutdown FORCEOFF VCC FORCEON INVALID PROTECTION DIODE MAX3243 PREVIOUS RS-232 VCC I Rx 5kΩ UART Tx CPU I/O CHIP WITH UART GND 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 7
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Table 1a. MAX3221/MAX3223 FORCEOFF and Enable Control Truth Table FORCEOFF EN T_OUT R_OUT 0 0 High-Z Active 0 1 High-Z High-Z 1 0 Active* Active 1 1 Active* High-Z Table 1b.
PAGE 8
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Table 2. AutoShutdown Logic RS-232 SIGNAL PRESENT AT RECEIVER INPUT FORCEOFF INPUT FORCEON INPUT INVALID INPUT Yes H X H Normal Operation No H H L Normal Operation (Forced On) No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) TRANSCEIVER STATUS MAX3243 is awake.
PAGE 9
T2 2V/div T1 50µs/div VCC = +3.3V C1–C4 = 0.1µF 6 5 4 3 VOUT+ VCC = 3.0V 2 1 T1 0 -1 T2 MAX3222-04 5V/div +3V to +5.5V RS-232 Transceivers with AutoShutdown TRANSMITTER OUTPUT VOLTAGE (V) MAX3221/MAX3223/ MAX3243 VOUT+ -2 -3 VCC VOUT- T3 VOUT- -4 -5 -6 0 1 2 3 4 5 6 7 LOAD CURRENT PER TRANSMITTER (mA) Figure 6. Transmitter Outputs When Exiting Shutdown or Powering Up Figure 7a. MAX3243 Transmitter Output Voltage vs.
PAGE 10
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown +3.3V 26 0.1µF 28 C1 0.1µF 24 1 C2 0.1µF 2 LOGIC INPUTS C1+ C1- VCC V+ MAX3243 C2+ V- 27 C3 0.1µF 3 C2- COMPUTER SERIAL PORT C4 0.
PAGE 11
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Table 3. Required Capacitor Values VCC (V) C1 (μF) C2, C3, C4 (μF) 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 VCC 0.1µF VCC C1+ C1 C1C2+ C2 MAX3221 MAX3223 MAX3243 Table 4. Logic Family Compatibility with Various Supply Voltages C4 R_ IN EN (MAX3221/3) FORCEOFF C3 T_ OUT R_ OUT VCC V- C2T_ IN 0V V+ 5kΩ 1000pF GND SYSTEM POWERSUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) 3.3 3.
PAGE 12
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Typical Operating Circuits +3.3V 15 0.1µF C5 2 C1+ C1 0.1µF 4 C15 C2 0.1µF 6 C2+ VCC V+ MAX3221 V- 3 C3 0.1µF 7 C2- 11 T1IN 28 C1+ C1 0.1µF 1 2 5kΩ INVALID 10 1 EN 12 FORCEOFF 16 FORCEON GND TO POWER MANAGEMENT UNIT LOGIC INPUTS VCC TTL/CMOS INPUTS 2 C1+ 4 C1- 6 C2+ V+ MAX3223 V- C3 0.1µF 7 13 T1IN T1OUT 17 12 T2IN T2OUT 8 C4 0.1µF T1OUT 9 13 T2IN T2OUT 10 12 T3IN T3OUT 11 C4 0.
PAGE 13
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown 3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from Maxim PART POWERSUPPLY VOLTAGE (V) NUMBER OF TRANSMITTERS/ RECEIVERS NUMBER OF RECEIVERS ACTIVE IN SHUTDOWN GUARANTEED DATA RATE (kbps) EIA/ TIA-232 OR 562 MAX212 3.0 to 3.6 3/5 5 120 232 Drives mice MAX218 1.8 to 4.25 2/2 2 120 232 Operates directly from batteries without a voltage regulator MAX562 2.7 to 5.
PAGE 14
MAX3221/MAX3223/ MAX3243 +3V to +5.
PAGE 15
MAX3221/MAX3223/ MAX3243 +3V to +5.5V RS-232 Transceivers with AutoShutdown Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 16
MAX3221/MAX3223/ MAX3243 REVISION NUMBER REVISION DATE 9 1/15 10 5/2019 +3V to +5.5V RS-232 Transceivers with AutoShutdown PAGES CHANGED DESCRIPTION Updated General Description and Benefits and Features sections 1 Added Package Information table 15 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.