MAX3322E:±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications

±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications

The MAX3322E/MAX3323E 3.0V to 5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces are designed for multidrop applications with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All RS-232 inputs and outputs are protected to ±15kV using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the IEC 1000-4-2 Contact Discharge method, and ±15kV using the Human Body Model. The MAX3322E/MAX3323E have pin-selectable 5kΩ /high-impedance RS-232 receivers. These devices are capable of receiving data in high-impedance mode. In multidrop applications, one receiver has a 5kΩ input resistance, while the other receivers are high impedance to ensure the RS-232 standard is observed. Logic control permits selection of the functional mode: high impedance or RS-232 standard load. The transmitters are enabled by logic control to allow the multiplexing of the inputs to a single UART. A proprietary low-dropout transmitter output stage enables 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 MAX3322E/MAX3323E are capable of running at data rates up to 250kbps while maintaining RS-232-compliant output levels. The MAX3322E/MAX3323E have a unique VL pin that allows operation in mixed-logic voltage systems. Both input and output logic levels are pin programmable through the VL pin. The MAX3322E is a 2Tx/2Rx device for hardware handshaking in standard RS-232 mode, and the MAX3323E is a 1Tx/1Rx, required in most multidrop applications. The MAX3322E is offered in a space-saving TSSOP package. The MAX3323E is offered in 16-pin DIP and space-saving TSSOP packages.

Key Features
  • Pin-Selectable 5kΩ/High-Impedance Receivers
  • Transmitter Outputs Three-Stated by Logic Control
  • VL Pin for Compatibility with Mixed Voltage Systems
  • 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E) Versions
  • 250kbps Data Rate
  • 1µA Low-Power Shutdown
  • High ESD Protection for RS-232 I/O Pins
    • ±15kV—Human Body Model
    • ±8kV—IEC 1000-4-2 Contact Discharge
    • ±15kV—IEC 1000-4-2 Air-Gap Discharge
MAX3322E, MAX3323E: Typical Operating Circuit
MAX3322E, MAX3323E: Typical Operating Circuit
Applications/Uses
  • Bar-Code Scanners
  • Data Splitters
  • Industrial Data Acquisition
  • Video Security
DataSheet
titleDownload file
MAX3322E-MAX3323E Data SheetMAX3322E-MAX3323E.pdf
Parametrics
Part NumberVSUPPLY
(V)
TxRxData Rate
(kbps)
ICC
(mA)
Internal Charge PumpExt. CapsCap. Value
(µF)
ESD Protect.
(±kV)
Rx Active in ShutdnPackage/PinsBudgetary
Price
mintypnomSee Notes
MAX3322E3
3.3
5
222501Yes50.1150TSSOP/20$4.20 @1k
MAX3323E11PDIP(N)/16
TSSOP/16
$4.49 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX3322EEUPNo Longer AvailableMAX3322EEUP+TSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
MAX3322EEUP+ActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
MAX3322EEUP+TActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
MAX3322EEUP-TNo Longer AvailableMAX3322EEUP+TTSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
MAX3322E-MAX3323E.pdf MAX3323E
MAX3322E.pdf MAX3322E
MAX3322E-MAX3323E.pdf MAX3323E