MAX3223:+3V to +5.5V RS-232 Transceivers with AutoShutdown

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. Please see order information table for package offerings.

Key Features
  • Integrated Charge Pump Circuitry Simplifies Power Requirements
    • Eliminates the Need for a ±12V 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
MAX3221, MAX3223, MAX3243: Typical Operating Circuit
MAX3221, MAX3223, MAX3243: Typical Operating Circuit
Applications/Uses
  • Battery-Powered Equipment
  • Hand-Held Equipment
  • Peripherals
  • Portable Diagnostics Equipment
DataSheet
titleDownload file
MAX3221-MAX3243 Data SheetMAX3221-MAX3243.pdf
Parametrics
Part NumberVSUPPLY
(V)
TxRxData Rate
(kbps)
ICC
(mA)
Internal Charge PumpExt. CapsCap. Value
(µF)
Rx Active in ShutdnPackage/PinsBudgetary
Price
mintypnomSee Notes
MAX32213.3
5
111200.3Yes40.11SSOP/16
TSSOP/16
$1.67 @1k
MAX3223222PDIP(N)/20
SSOP/20
TSSOP/20
$2.56 @1k
MAX3243351SOIC(W)/28
SSOP/28
TSSOP/28
$4.45 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX3223C/DNo Longer AvailableDICE SALES,;NA pin;DICE;0°C to +70°CSee data sheet
MAX3223CAPNo Longer AvailableMAX3223CAP+SSOP,;20 pin;57.9 mm²0°C to +70°CNo
MAX3223CAP+ActiveSSOP,;20 pin;57.9 mm²0°C to +70°CLead Free
MAX3223CAP+G65No Longer AvailableSSOP;0°C to +70°CSee data sheet
MAX3223CAP+TActiveSSOP,;20 pin;57.9 mm²0°C to +70°CLead Free
MAX3223CAP+TG65No Longer AvailableSSOP;0°C to +70°CSee data sheet
MAX3223CAP-TNo Longer AvailableMAX3223CAP+TSSOP,;20 pin;57.9 mm²0°C to +70°CNo
MAX3223CPPNo Longer AvailableMAX3223CPP+PDIP(N),;20 pin;219.2 mm²0°C to +70°CNo
MAX3223CPP+ActivePDIP(N),;20 pin;219.2 mm²0°C to +70°CLead Free
MAX3223CUPNo Longer AvailableMAX3223CUP+TSSOP,;20 pin;45.2 mm²0°C to +70°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX3223CUP+ActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
MAX3223CUP+TActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
MAX3223CUP-TNo Longer AvailableMAX3223CUP+TTSSOP,;20 pin;45.2 mm²0°C to +70°CNo
MAX3223EAPNo Longer AvailableMAX3223EAP+SSOP,;20 pin;57.9 mm²-40°C to +85°CNo
MAX3223EAP+ActiveSSOP,;20 pin;57.9 mm²-40°C to +85°CLead Free
MAX3223EAP+TActiveSSOP,;20 pin;57.9 mm²-40°C to +85°CLead Free
MAX3223EAP-TNo Longer AvailableMAX3223EAP+TSSOP,;20 pin;57.9 mm²-40°C to +85°CNo
MAX3223EPPNo Longer AvailableMAX3223EPP+PDIP(N),;20 pin;217.1 mm²-40°C to +85°CNo
MAX3223EPP+ActivePDIP(N),;20 pin;217.1 mm²-40°C to +85°CLead Free
MAX3223EUPNo Longer AvailableMAX3223EUP+TSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX3223EUP+ActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
MAX3223EUP+TActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
MAX3223EUP-TNo Longer AvailableMAX3223EUP+TTSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
MAX3221-MAX3243.pdf MAX3243
Determining Clock Accuracy Requirements for UART Communications MAX3206E
RS-232 Features Explained MAX3381E
New RS-232 ICs Feature 1µA Supply Current, ±15kV ESD Protection, and 3V Operation MAX561
MAX3223.pdf MAX3223